Added in [API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels) Summary: [Inherited Constants](https://developer.android.com/reference/java/lang/reflect/Field#inhconstants) \| [Methods](https://developer.android.com/reference/java/lang/reflect/Field#pubmethods) \| [Inherited Methods](https://developer.android.com/reference/java/lang/reflect/Field#inhmethods)
# Field
`
public
final
class
Field
`
`
`
`
extends https://developer.android.com/reference/java/lang/reflect/AccessibleObject
`
`
implements
https://developer.android.com/reference/java/lang/reflect/Member
`
|---|---|---|
| [java.lang.Object](https://developer.android.com/reference/java/lang/Object) |||
| ↳ | [java.lang.reflect.AccessibleObject](https://developer.android.com/reference/java/lang/reflect/AccessibleObject) ||
| | ↳ | java.lang.reflect.Field |
*** ** * ** ***
A `Field` provides information about, and dynamic access to, a
single field of a class or an interface. The reflected field may
be a class (static) field or an instance field.
A `Field` permits widening conversions to occur during a get or
set access operation, but throws an `IllegalArgumentException` if a
narrowing conversion would occur.
**See also:**
- `https://developer.android.com/reference/java/lang/reflect/Member`
- `https://developer.android.com/reference/java/lang/Class`
- `https://developer.android.com/reference/java/lang/Class#getFields()`
- `https://developer.android.com/reference/java/lang/Class#getField(java.lang.String)`
- `https://developer.android.com/reference/java/lang/Class#getDeclaredFields()`
- `https://developer.android.com/reference/java/lang/Class#getDeclaredField(java.lang.String)`
## Summary
| ### Inherited constants |
|---|
| From interface `https://developer.android.com/reference/java/lang/reflect/Member` |---|---| | `int` | `https://developer.android.com/reference/java/lang/reflect/Member#DECLARED` Identifies the set of declared members of a class or interface. | | `int` | `https://developer.android.com/reference/java/lang/reflect/Member#PUBLIC` Identifies the set of all public members of a class or interface, including inherited members. | |
| ### Public methods ||
|---|---|
| ` boolean` | ` https://developer.android.com/reference/java/lang/reflect/Field#equals(java.lang.Object)(https://developer.android.com/reference/java/lang/Object obj) ` Compares this `Field` against the specified object. |
| ` https://developer.android.com/reference/java/lang/Object` | ` https://developer.android.com/reference/java/lang/reflect/Field#get(java.lang.Object)(https://developer.android.com/reference/java/lang/Object obj) ` Returns the value of the field represented by this `Field`, on the specified object. |
| ` T` | ` https://developer.android.com/reference/java/lang/reflect/Field#getAnnotation(java.lang.Class)(https://developer.android.com/reference/java/lang/Class annotationClass) ` Returns this element's annotation for the specified type if such an annotation is *present*, else null. |
| ` T[]` | ` https://developer.android.com/reference/java/lang/reflect/Field#getAnnotationsByType(java.lang.Class)(https://developer.android.com/reference/java/lang/Class annotationClass) ` Returns annotations that are *associated* with this element. |
| ` boolean` | ` https://developer.android.com/reference/java/lang/reflect/Field#getBoolean(java.lang.Object)(https://developer.android.com/reference/java/lang/Object obj) ` Gets the value of a static or instance `boolean` field. |
| ` byte` | ` https://developer.android.com/reference/java/lang/reflect/Field#getByte(java.lang.Object)(https://developer.android.com/reference/java/lang/Object obj) ` Gets the value of a static or instance `byte` field. |
| ` char` | ` https://developer.android.com/reference/java/lang/reflect/Field#getChar(java.lang.Object)(https://developer.android.com/reference/java/lang/Object obj) ` Gets the value of a static or instance field of type `char` or of another primitive type convertible to type `char` via a widening conversion. |
| ` https://developer.android.com/reference/java/lang/annotation/Annotation` | ` https://developer.android.com/reference/java/lang/reflect/Field#getDeclaredAnnotations()() ` Returns annotations that are *directly present* on this element. |
| ` https://developer.android.com/reference/java/lang/Class` | ` https://developer.android.com/reference/java/lang/reflect/Field#getDeclaringClass()() ` Returns the `Class` object representing the class or interface that declares the field represented by this `Field` object. |
| ` double` | ` https://developer.android.com/reference/java/lang/reflect/Field#getDouble(java.lang.Object)(https://developer.android.com/reference/java/lang/Object obj) ` Gets the value of a static or instance field of type `double` or of another primitive type convertible to type `double` via a widening conversion. |
| ` float` | ` https://developer.android.com/reference/java/lang/reflect/Field#getFloat(java.lang.Object)(https://developer.android.com/reference/java/lang/Object obj) ` Gets the value of a static or instance field of type `float` or of another primitive type convertible to type `float` via a widening conversion. |
| ` https://developer.android.com/reference/java/lang/reflect/Type` | ` https://developer.android.com/reference/java/lang/reflect/Field#getGenericType()() ` Returns a `Type` object that represents the declared type for the field represented by this `Field` object. |
| ` int` | ` https://developer.android.com/reference/java/lang/reflect/Field#getInt(java.lang.Object)(https://developer.android.com/reference/java/lang/Object obj) ` Gets the value of a static or instance field of type `int` or of another primitive type convertible to type `int` via a widening conversion. |
| ` long` | ` https://developer.android.com/reference/java/lang/reflect/Field#getLong(java.lang.Object)(https://developer.android.com/reference/java/lang/Object obj) ` Gets the value of a static or instance field of type `long` or of another primitive type convertible to type `long` via a widening conversion. |
| ` int` | ` https://developer.android.com/reference/java/lang/reflect/Field#getModifiers()() ` Returns the Java language modifiers for the field represented by this `Field` object, as an integer. |
| ` https://developer.android.com/reference/java/lang/String` | ` https://developer.android.com/reference/java/lang/reflect/Field#getName()() ` Returns the name of the field represented by this `Field` object. |
| ` short` | ` https://developer.android.com/reference/java/lang/reflect/Field#getShort(java.lang.Object)(https://developer.android.com/reference/java/lang/Object obj) ` Gets the value of a static or instance field of type `short` or of another primitive type convertible to type `short` via a widening conversion. |
| ` https://developer.android.com/reference/java/lang/Class` | ` https://developer.android.com/reference/java/lang/reflect/Field#getType()() ` Returns a `Class` object that identifies the declared type for the field represented by this `Field` object. |
| ` int` | ` https://developer.android.com/reference/java/lang/reflect/Field#hashCode()() ` Returns a hashcode for this `Field`. |
| ` boolean` | ` https://developer.android.com/reference/java/lang/reflect/Field#isAnnotationPresent(java.lang.Class)(https://developer.android.com/reference/java/lang/Class annotationType) ` Returns true if an annotation for the specified type is *present* on this element, else false. |
| ` boolean` | ` https://developer.android.com/reference/java/lang/reflect/Field#isEnumConstant()() ` Returns `true` if this field represents an element of an enumerated type; returns `false` otherwise. |
| ` boolean` | ` https://developer.android.com/reference/java/lang/reflect/Field#isSynthetic()() ` Returns `true` if this field is a synthetic field; returns `false` otherwise. |
| ` void` | ` https://developer.android.com/reference/java/lang/reflect/Field#set(java.lang.Object,%20java.lang.Object)(https://developer.android.com/reference/java/lang/Object obj, https://developer.android.com/reference/java/lang/Object value) ` Sets the field represented by this `Field` object on the specified object argument to the specified new value. |
| ` void` | ` https://developer.android.com/reference/java/lang/reflect/Field#setBoolean(java.lang.Object,%20boolean)(https://developer.android.com/reference/java/lang/Object obj, boolean z) ` Sets the value of a field as a `boolean` on the specified object. |
| ` void` | ` https://developer.android.com/reference/java/lang/reflect/Field#setByte(java.lang.Object,%20byte)(https://developer.android.com/reference/java/lang/Object obj, byte b) ` Sets the value of a field as a `byte` on the specified object. |
| ` void` | ` https://developer.android.com/reference/java/lang/reflect/Field#setChar(java.lang.Object,%20char)(https://developer.android.com/reference/java/lang/Object obj, char c) ` Sets the value of a field as a `char` on the specified object. |
| ` void` | ` https://developer.android.com/reference/java/lang/reflect/Field#setDouble(java.lang.Object,%20double)(https://developer.android.com/reference/java/lang/Object obj, double d) ` Sets the value of a field as a `double` on the specified object. |
| ` void` | ` https://developer.android.com/reference/java/lang/reflect/Field#setFloat(java.lang.Object,%20float)(https://developer.android.com/reference/java/lang/Object obj, float f) ` Sets the value of a field as a `float` on the specified object. |
| ` void` | ` https://developer.android.com/reference/java/lang/reflect/Field#setInt(java.lang.Object,%20int)(https://developer.android.com/reference/java/lang/Object obj, int i) ` Sets the value of a field as an `int` on the specified object. |
| ` void` | ` https://developer.android.com/reference/java/lang/reflect/Field#setLong(java.lang.Object,%20long)(https://developer.android.com/reference/java/lang/Object obj, long l) ` Sets the value of a field as a `long` on the specified object. |
| ` void` | ` https://developer.android.com/reference/java/lang/reflect/Field#setShort(java.lang.Object,%20short)(https://developer.android.com/reference/java/lang/Object obj, short s) ` Sets the value of a field as a `short` on the specified object. |
| ` https://developer.android.com/reference/java/lang/String` | ` https://developer.android.com/reference/java/lang/reflect/Field#toGenericString()() ` Returns a string describing this `Field`, including its generic type. |
| ` https://developer.android.com/reference/java/lang/String` | ` https://developer.android.com/reference/java/lang/reflect/Field#toString()() ` Returns a string describing this `Field`. |
| ### Inherited methods |
|---|---|
| From class ` https://developer.android.com/reference/java/lang/reflect/AccessibleObject ` |---|---| | ` T` | ` https://developer.android.com/reference/java/lang/reflect/AccessibleObject#getAnnotation(java.lang.Class)(https://developer.android.com/reference/java/lang/Class annotationClass) ` Returns this element's annotation for the specified type if such an annotation is *present*, else null. | | ` https://developer.android.com/reference/java/lang/annotation/Annotation` | ` https://developer.android.com/reference/java/lang/reflect/AccessibleObject#getAnnotations()() ` Returns annotations that are *present* on this element. | | ` T[]` | ` https://developer.android.com/reference/java/lang/reflect/AccessibleObject#getAnnotationsByType(java.lang.Class)(https://developer.android.com/reference/java/lang/Class annotationClass) ` Returns annotations that are *associated* with this element. | | ` T` | ` https://developer.android.com/reference/java/lang/reflect/AccessibleObject#getDeclaredAnnotation(java.lang.Class)(https://developer.android.com/reference/java/lang/Class annotationClass) ` Returns this element's annotation for the specified type if such an annotation is *directly present*, else null. | | ` https://developer.android.com/reference/java/lang/annotation/Annotation` | ` https://developer.android.com/reference/java/lang/reflect/AccessibleObject#getDeclaredAnnotations()() ` Returns annotations that are *directly present* on this element. | | ` T[]` | ` https://developer.android.com/reference/java/lang/reflect/AccessibleObject#getDeclaredAnnotationsByType(java.lang.Class)(https://developer.android.com/reference/java/lang/Class annotationClass) ` Returns this element's annotation(s) for the specified type if such annotations are either *directly present* or *indirectly present*. | | ` boolean` | ` https://developer.android.com/reference/java/lang/reflect/AccessibleObject#isAccessible()() ` Get the value of the `accessible` flag for this object. | | ` boolean` | ` https://developer.android.com/reference/java/lang/reflect/AccessibleObject#isAnnotationPresent(java.lang.Class)(https://developer.android.com/reference/java/lang/Class annotationClass) ` Returns true if an annotation for the specified type is *present* on this element, else false. | | ` void` | ` https://developer.android.com/reference/java/lang/reflect/AccessibleObject#setAccessible(boolean)(boolean flag) ` Set the `accessible` flag for this object to the indicated boolean value. | | ` static void` | ` https://developer.android.com/reference/java/lang/reflect/AccessibleObject#setAccessible(java.lang.reflect.AccessibleObject[],%20boolean)(https://developer.android.com/reference/java/lang/reflect/AccessibleObject array, boolean flag) ` Convenience method to set the `accessible` flag for an array of objects with a single security check (for efficiency). | ||
| From class ` https://developer.android.com/reference/java/lang/Object ` |---|---| | ` https://developer.android.com/reference/java/lang/Object` | ` https://developer.android.com/reference/java/lang/Object#clone()() ` Creates and returns a copy of this object. | | ` boolean` | ` https://developer.android.com/reference/java/lang/Object#equals(java.lang.Object)(https://developer.android.com/reference/java/lang/Object obj) ` Indicates whether some other object is "equal to" this one. | | ` void` | ` https://developer.android.com/reference/java/lang/Object#finalize()() ` Called by the garbage collector on an object when garbage collection determines that there are no more references to the object. | | ` final https://developer.android.com/reference/java/lang/Class` | ` https://developer.android.com/reference/java/lang/Object#getClass()() ` Returns the runtime class of this `Object`. | | ` int` | ` https://developer.android.com/reference/java/lang/Object#hashCode()() ` Returns a hash code value for the object. | | ` final void` | ` https://developer.android.com/reference/java/lang/Object#notify()() ` Wakes up a single thread that is waiting on this object's monitor. | | ` final void` | ` https://developer.android.com/reference/java/lang/Object#notifyAll()() ` Wakes up all threads that are waiting on this object's monitor. | | ` https://developer.android.com/reference/java/lang/String` | ` https://developer.android.com/reference/java/lang/Object#toString()() ` Returns a string representation of the object. | | ` final void` | ` https://developer.android.com/reference/java/lang/Object#wait(long,%20int)(long timeoutMillis, int nanos) ` Causes the current thread to wait until it is awakened, typically by being *notified* or *interrupted*, or until a certain amount of real time has elapsed. | | ` final void` | ` https://developer.android.com/reference/java/lang/Object#wait(long)(long timeoutMillis) ` Causes the current thread to wait until it is awakened, typically by being *notified* or *interrupted*, or until a certain amount of real time has elapsed. | | ` final void` | ` https://developer.android.com/reference/java/lang/Object#wait()() ` Causes the current thread to wait until it is awakened, typically by being *notified* or *interrupted*. | ||
| From interface ` https://developer.android.com/reference/java/lang/reflect/AnnotatedElement ` |---|---| | ` abstract T` | ` https://developer.android.com/reference/java/lang/reflect/AnnotatedElement#getAnnotation(java.lang.Class)(https://developer.android.com/reference/java/lang/Class annotationClass) ` Returns this element's annotation for the specified type if such an annotation is *present*, else null. | | ` abstract https://developer.android.com/reference/java/lang/annotation/Annotation` | ` https://developer.android.com/reference/java/lang/reflect/AnnotatedElement#getAnnotations()() ` Returns annotations that are *present* on this element. | | ` default T[]` | ` https://developer.android.com/reference/java/lang/reflect/AnnotatedElement#getAnnotationsByType(java.lang.Class)(https://developer.android.com/reference/java/lang/Class annotationClass) ` Returns annotations that are *associated* with this element. | | ` default T` | ` https://developer.android.com/reference/java/lang/reflect/AnnotatedElement#getDeclaredAnnotation(java.lang.Class)(https://developer.android.com/reference/java/lang/Class annotationClass) ` Returns this element's annotation for the specified type if such an annotation is *directly present*, else null. | | ` abstract https://developer.android.com/reference/java/lang/annotation/Annotation` | ` https://developer.android.com/reference/java/lang/reflect/AnnotatedElement#getDeclaredAnnotations()() ` Returns annotations that are *directly present* on this element. | | ` default T[]` | ` https://developer.android.com/reference/java/lang/reflect/AnnotatedElement#getDeclaredAnnotationsByType(java.lang.Class)(https://developer.android.com/reference/java/lang/Class annotationClass) ` Returns this element's annotation(s) for the specified type if such annotations are either *directly present* or *indirectly present*. | | ` default boolean` | ` https://developer.android.com/reference/java/lang/reflect/AnnotatedElement#isAnnotationPresent(java.lang.Class)(https://developer.android.com/reference/java/lang/Class annotationClass) ` Returns true if an annotation for the specified type is *present* on this element, else false. | ||
| From interface ` https://developer.android.com/reference/java/lang/reflect/Member ` |---|---| | ` abstract https://developer.android.com/reference/java/lang/Class` | ` https://developer.android.com/reference/java/lang/reflect/Member#getDeclaringClass()() ` Returns the Class object representing the class or interface that declares the member or constructor represented by this Member. | | ` abstract int` | ` https://developer.android.com/reference/java/lang/reflect/Member#getModifiers()() ` Returns the Java language modifiers for the member or constructor represented by this Member, as an integer. | | ` abstract https://developer.android.com/reference/java/lang/String` | ` https://developer.android.com/reference/java/lang/reflect/Member#getName()() ` Returns the simple name of the underlying member or constructor represented by this Member. | | ` abstract boolean` | ` https://developer.android.com/reference/java/lang/reflect/Member#isSynthetic()() ` Returns `true` if this member was introduced by the compiler; returns `false` otherwise. | ||
## Public methods
### equals
Added in [API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
```
public boolean equals (Object obj)
```
Compares this `Field` against the specified object. Returns
true if the objects are the same. Two `Field` objects are the same if
they were declared by the same class and have the same name
and type.
| Parameters ||
|---|---|
| `obj` | `Object`: the reference object with which to compare.
|
| Returns ||
|---|---|
| `boolean` | `true` if this object is the same as the obj argument; `false` otherwise.
|
### get
Added in [API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
```
public Object get (Object obj)
```
Returns the value of the field represented by this `Field`, on
the specified object. The value is automatically wrapped in an
object if it has a primitive type.
The underlying field's value is obtained as follows:
If the underlying field is a static field, the `obj` argument
is ignored; it may be null.
Otherwise, the underlying field is an instance field. If the
specified `obj` argument is null, the method throws a
`NullPointerException`. If the specified object is not an
instance of the class or interface declaring the underlying
field, the method throws an `IllegalArgumentException`.
If this `Field` object is enforcing Java language access control, and
the underlying field is inaccessible, the method throws an
`IllegalAccessException`.
If the underlying field is static, the class that declared the
field is initialized if it has not already been initialized.
Otherwise, the value is retrieved from the underlying instance
or static field. If the field has a primitive type, the value
is wrapped in an object before being returned, otherwise it is
returned as is.
If the field is hidden in the type of `obj`,
the field's value is obtained according to the preceding rules.
| Parameters ||
|---|---|
| `obj` | `Object`: object from which the represented field's value is to be extracted
|
| Returns ||
|---|---|
| `https://developer.android.com/reference/java/lang/Object` | the value of the represented field in object `obj`; primitive values are wrapped in an appropriate object before being returned
|
| Throws ||
|---|---|
| `https://developer.android.com/reference/java/lang/ExceptionInInitializerError` | if the initialization provoked by this method fails. |
| `https://developer.android.com/reference/java/lang/IllegalAccessException` | if this `Field` object is enforcing Java language access control and the underlying field is inaccessible. |
| `https://developer.android.com/reference/java/lang/IllegalArgumentException` | if the specified object is not an instance of the class or interface declaring the underlying field (or a subclass or implementor thereof). |
| `https://developer.android.com/reference/java/lang/NullPointerException` | if the specified object is null and the field is an instance field. |
### getAnnotation
Added in [API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
```
public T getAnnotation (Class annotationClass)
```
Returns this element's annotation for the specified type if
such an annotation is *present*, else null.
| Parameters ||
|---|---|
| `annotationClass` | `Class`: the Class object corresponding to the annotation type
|
| Returns ||
|---|---|
| `T` | this element's annotation for the specified annotation type if present on this element, else null
|
| Throws ||
|---|---|
| `https://developer.android.com/reference/java/lang/NullPointerException` | |
### getAnnotationsByType
Added in [API level 24](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
```
public T[] getAnnotationsByType (Class annotationClass)
```
Returns annotations that are *associated* with this element.
If there are no annotations *associated* with this element, the return
value is an array of length 0.
The difference between this method and `https://developer.android.com/reference/java/lang/reflect/AnnotatedElement#getAnnotation(java.lang.Class)`
is that this method detects if its argument is a *repeatable
annotation type* (JLS 9.6), and if so, attempts to find one or
more annotations of that type by "looking through" a container
annotation.
The caller of this method is free to modify the returned array; it will
have no effect on the arrays returned to other callers.
| Parameters ||
|---|---|
| `annotationClass` | `Class`: the Class object corresponding to the annotation type
|
| Returns ||
|---|---|
| `T[]` | all this element's annotations for the specified annotation type if associated with this element, else an array of length zero
|
| Throws ||
|---|---|
| `https://developer.android.com/reference/java/lang/NullPointerException` | |
### getBoolean
Added in [API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
```
public boolean getBoolean (Object obj)
```
Gets the value of a static or instance `boolean` field.
| Parameters ||
|---|---|
| `obj` | `Object`: the object to extract the `boolean` value from
|
| Returns ||
|---|---|
| `boolean` | the value of the `boolean` field
|
| Throws ||
|---|---|
| `https://developer.android.com/reference/java/lang/ExceptionInInitializerError` | if the initialization provoked by this method fails. |
| `https://developer.android.com/reference/java/lang/IllegalAccessException` | if this `Field` object is enforcing Java language access control and the underlying field is inaccessible. |
| `https://developer.android.com/reference/java/lang/IllegalArgumentException` | if the specified object is not an instance of the class or interface declaring the underlying field (or a subclass or implementor thereof), or if the field value cannot be converted to the type `boolean` by a widening conversion. |
| `https://developer.android.com/reference/java/lang/NullPointerException` | if the specified object is null and the field is an instance field. |
**See also:**
- `https://developer.android.com/reference/java/lang/reflect/Field#get(java.lang.Object)`
### getByte
Added in [API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
```
public byte getByte (Object obj)
```
Gets the value of a static or instance `byte` field.
| Parameters ||
|---|---|
| `obj` | `Object`: the object to extract the `byte` value from
|
| Returns ||
|---|---|
| `byte` | the value of the `byte` field
|
| Throws ||
|---|---|
| `https://developer.android.com/reference/java/lang/ExceptionInInitializerError` | if the initialization provoked by this method fails. |
| `https://developer.android.com/reference/java/lang/IllegalAccessException` | if this `Field` object is enforcing Java language access control and the underlying field is inaccessible. |
| `https://developer.android.com/reference/java/lang/IllegalArgumentException` | if the specified object is not an instance of the class or interface declaring the underlying field (or a subclass or implementor thereof), or if the field value cannot be converted to the type `byte` by a widening conversion. |
| `https://developer.android.com/reference/java/lang/NullPointerException` | if the specified object is null and the field is an instance field. |
**See also:**
- `https://developer.android.com/reference/java/lang/reflect/Field#get(java.lang.Object)`
### getChar
Added in [API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
```
public char getChar (Object obj)
```
Gets the value of a static or instance field of type
`char` or of another primitive type convertible to
type `char` via a widening conversion.
| Parameters ||
|---|---|
| `obj` | `Object`: the object to extract the `char` value from
|
| Returns ||
|---|---|
| `char` | the value of the field converted to type `char`
|
| Throws ||
|---|---|
| `https://developer.android.com/reference/java/lang/ExceptionInInitializerError` | if the initialization provoked by this method fails. |
| `https://developer.android.com/reference/java/lang/IllegalAccessException` | if this `Field` object is enforcing Java language access control and the underlying field is inaccessible. |
| `https://developer.android.com/reference/java/lang/IllegalArgumentException` | if the specified object is not an instance of the class or interface declaring the underlying field (or a subclass or implementor thereof), or if the field value cannot be converted to the type `char` by a widening conversion. |
| `https://developer.android.com/reference/java/lang/NullPointerException` | if the specified object is null and the field is an instance field. |
**See also:**
- `https://developer.android.com/reference/java/lang/reflect/Field#get(java.lang.Object)`
### getDeclaredAnnotations
Added in [API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
```
public Annotation[] getDeclaredAnnotations ()
```
Returns annotations that are *directly present* on this element.
This method ignores inherited annotations.
If there are no annotations *directly present* on this element,
the return value is an array of length 0.
The caller of this method is free to modify the returned array; it will
have no effect on the arrays returned to other callers.
| Returns ||
|---|---|
| `https://developer.android.com/reference/java/lang/annotation/Annotation` | annotations directly present on this element
|
### getDeclaringClass
Added in [API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
```
public Class getDeclaringClass ()
```
Returns the `Class` object representing the class or interface
that declares the field represented by this `Field` object.
| Returns ||
|---|---|
| `https://developer.android.com/reference/java/lang/Class` | an object representing the declaring class of the underlying member
|
### getDouble
Added in [API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
```
public double getDouble (Object obj)
```
Gets the value of a static or instance field of type
`double` or of another primitive type convertible to
type `double` via a widening conversion.
| Parameters ||
|---|---|
| `obj` | `Object`: the object to extract the `double` value from
|
| Returns ||
|---|---|
| `double` | the value of the field converted to type `double`
|
| Throws ||
|---|---|
| `https://developer.android.com/reference/java/lang/ExceptionInInitializerError` | if the initialization provoked by this method fails. |
| `https://developer.android.com/reference/java/lang/IllegalAccessException` | if this `Field` object is enforcing Java language access control and the underlying field is inaccessible. |
| `https://developer.android.com/reference/java/lang/IllegalArgumentException` | if the specified object is not an instance of the class or interface declaring the underlying field (or a subclass or implementor thereof), or if the field value cannot be converted to the type `double` by a widening conversion. |
| `https://developer.android.com/reference/java/lang/NullPointerException` | if the specified object is null and the field is an instance field. |
**See also:**
- `https://developer.android.com/reference/java/lang/reflect/Field#get(java.lang.Object)`
### getFloat
Added in [API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
```
public float getFloat (Object obj)
```
Gets the value of a static or instance field of type
`float` or of another primitive type convertible to
type `float` via a widening conversion.
| Parameters ||
|---|---|
| `obj` | `Object`: the object to extract the `float` value from
|
| Returns ||
|---|---|
| `float` | the value of the field converted to type `float`
|
| Throws ||
|---|---|
| `https://developer.android.com/reference/java/lang/ExceptionInInitializerError` | if the initialization provoked by this method fails. |
| `https://developer.android.com/reference/java/lang/IllegalAccessException` | if this `Field` object is enforcing Java language access control and the underlying field is inaccessible. |
| `https://developer.android.com/reference/java/lang/IllegalArgumentException` | if the specified object is not an instance of the class or interface declaring the underlying field (or a subclass or implementor thereof), or if the field value cannot be converted to the type `float` by a widening conversion. |
| `https://developer.android.com/reference/java/lang/NullPointerException` | if the specified object is null and the field is an instance field. |
**See also:**
- `https://developer.android.com/reference/java/lang/reflect/Field#get(java.lang.Object)`
### getGenericType
Added in [API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
```
public Type getGenericType ()
```
Returns a `Type` object that represents the declared type for
the field represented by this `Field` object.
If the `Type` is a parameterized type, the
`Type` object returned must accurately reflect the
actual type parameters used in the source code.
If the type of the underlying field is a type variable or a
parameterized type, it is created. Otherwise, it is resolved.
| Returns ||
|---|---|
| `https://developer.android.com/reference/java/lang/reflect/Type` | a `Type` object that represents the declared type for the field represented by this `Field` object
|
| Throws ||
|---|---|
| `https://developer.android.com/reference/java/lang/TypeNotPresentException` | if the generic type signature of the underlying field refers to a non-existent type declaration |
| `https://developer.android.com/reference/java/lang/reflect/GenericSignatureFormatError` | if the generic field signature does not conform to the format specified in The Java™ Virtual Machine Specification |
| `https://developer.android.com/reference/java/lang/reflect/MalformedParameterizedTypeException` | if the generic signature of the underlying field refers to a parameterized type that cannot be instantiated for any reason |
### getInt
Added in [API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
```
public int getInt (Object obj)
```
Gets the value of a static or instance field of type
`int` or of another primitive type convertible to
type `int` via a widening conversion.
| Parameters ||
|---|---|
| `obj` | `Object`: the object to extract the `int` value from
|
| Returns ||
|---|---|
| `int` | the value of the field converted to type `int`
|
| Throws ||
|---|---|
| `https://developer.android.com/reference/java/lang/ExceptionInInitializerError` | if the initialization provoked by this method fails. |
| `https://developer.android.com/reference/java/lang/IllegalAccessException` | if this `Field` object is enforcing Java language access control and the underlying field is inaccessible. |
| `https://developer.android.com/reference/java/lang/IllegalArgumentException` | if the specified object is not an instance of the class or interface declaring the underlying field (or a subclass or implementor thereof), or if the field value cannot be converted to the type `int` by a widening conversion. |
| `https://developer.android.com/reference/java/lang/NullPointerException` | if the specified object is null and the field is an instance field. |
**See also:**
- `https://developer.android.com/reference/java/lang/reflect/Field#get(java.lang.Object)`
### getLong
Added in [API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
```
public long getLong (Object obj)
```
Gets the value of a static or instance field of type
`long` or of another primitive type convertible to
type `long` via a widening conversion.
| Parameters ||
|---|---|
| `obj` | `Object`: the object to extract the `long` value from
|
| Returns ||
|---|---|
| `long` | the value of the field converted to type `long`
|
| Throws ||
|---|---|
| `https://developer.android.com/reference/java/lang/ExceptionInInitializerError` | if the initialization provoked by this method fails. |
| `https://developer.android.com/reference/java/lang/IllegalAccessException` | if this `Field` object is enforcing Java language access control and the underlying field is inaccessible. |
| `https://developer.android.com/reference/java/lang/IllegalArgumentException` | if the specified object is not an instance of the class or interface declaring the underlying field (or a subclass or implementor thereof), or if the field value cannot be converted to the type `long` by a widening conversion. |
| `https://developer.android.com/reference/java/lang/NullPointerException` | if the specified object is null and the field is an instance field. |
**See also:**
- `https://developer.android.com/reference/java/lang/reflect/Field#get(java.lang.Object)`
### getModifiers
Added in [API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
```
public int getModifiers ()
```
Returns the Java language modifiers for the field represented
by this `Field` object, as an integer. The `Modifier` class should
be used to decode the modifiers.
| Returns ||
|---|---|
| `int` | the Java language modifiers for the underlying member
|
**See also:**
- `https://developer.android.com/reference/java/lang/reflect/Modifier`
### getName
Added in [API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
```
public String getName ()
```
Returns the name of the field represented by this `Field` object.
| Returns ||
|---|---|
| `https://developer.android.com/reference/java/lang/String` | the simple name of the underlying member
|
### getShort
Added in [API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
```
public short getShort (Object obj)
```
Gets the value of a static or instance field of type
`short` or of another primitive type convertible to
type `short` via a widening conversion.
| Parameters ||
|---|---|
| `obj` | `Object`: the object to extract the `short` value from
|
| Returns ||
|---|---|
| `short` | the value of the field converted to type `short`
|
| Throws ||
|---|---|
| `https://developer.android.com/reference/java/lang/ExceptionInInitializerError` | if the initialization provoked by this method fails. |
| `https://developer.android.com/reference/java/lang/IllegalAccessException` | if this `Field` object is enforcing Java language access control and the underlying field is inaccessible. |
| `https://developer.android.com/reference/java/lang/IllegalArgumentException` | if the specified object is not an instance of the class or interface declaring the underlying field (or a subclass or implementor thereof), or if the field value cannot be converted to the type `short` by a widening conversion. |
| `https://developer.android.com/reference/java/lang/NullPointerException` | if the specified object is null and the field is an instance field. |
**See also:**
- `https://developer.android.com/reference/java/lang/reflect/Field#get(java.lang.Object)`
### getType
Added in [API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
```
public Class getType ()
```
Returns a `Class` object that identifies the
declared type for the field represented by this
`Field` object.
| Returns ||
|---|---|
| `https://developer.android.com/reference/java/lang/Class` | a `Class` object identifying the declared type of the field represented by this object
|
### hashCode
Added in [API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
```
public int hashCode ()
```
Returns a hashcode for this `Field`. This is computed as the
exclusive-or of the hashcodes for the underlying field's
declaring class name and its name.
| Returns ||
|---|---|
| `int` | a hash code value for this object.
|
### isAnnotationPresent
Added in [API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
```
public boolean isAnnotationPresent (Class annotationType)
```
Returns true if an annotation for the specified type
is *present* on this element, else false. This method
is designed primarily for convenient access to marker annotations.
The truth value returned by this method is equivalent to:
`getAnnotation(annotationClass) != null`
The body of the default method is specified to be the code
above.
| Parameters ||
|---|---|
| `annotationType` | `Class`: the Class object corresponding to the annotation type
|
| Returns ||
|---|---|
| `boolean` | true if an annotation for the specified annotation type is present on this element, else false
|
### isEnumConstant
Added in [API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
```
public boolean isEnumConstant ()
```
Returns `true` if this field represents an element of
an enumerated type; returns `false` otherwise.
| Returns ||
|---|---|
| `boolean` | `true` if and only if this field represents an element of an enumerated type.
|
### isSynthetic
Added in [API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
```
public boolean isSynthetic ()
```
Returns `true` if this field is a synthetic
field; returns `false` otherwise.
| Returns ||
|---|---|
| `boolean` | true if and only if this field is a synthetic field as defined by the Java Language Specification.
|
### set
Added in [API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
```
public void set (Object obj,
Object value)
```
Sets the field represented by this `Field` object on the
specified object argument to the specified new value. The new
value is automatically unwrapped if the underlying field has a
primitive type.
The operation proceeds as follows:
If the underlying field is static, the `obj` argument is
ignored; it may be null.
Otherwise the underlying field is an instance field. If the
specified object argument is null, the method throws a
`NullPointerException`. If the specified object argument is not
an instance of the class or interface declaring the underlying
field, the method throws an `IllegalArgumentException`.
If this `Field` object is enforcing Java language access control, and
the underlying field is inaccessible, the method throws an
`IllegalAccessException`.
If the underlying field is final, this `Field` object has
*write* access if and only if the following conditions are met:
- `https://developer.android.com/reference/java/lang/reflect/AccessibleObject#setAccessible(boolean)` has succeeded for this `Field` object;
- the field is non-static; and
- the field's declaring class is not a [record class](https://developer.android.com/reference/java/lang/Class#isRecord()).
If any of the above checks is not met, this method throws an `IllegalAccessException`.
Setting a final field in this way
is meaningful only during deserialization or reconstruction of
instances of classes with blank final fields, before they are
made available for access by other parts of a program. Use in
any other context may have unpredictable effects, including cases
in which other parts of a program continue to use the original
value of this field.
If the underlying field is of a primitive type, an unwrapping
conversion is attempted to convert the new value to a value of
a primitive type. If this attempt fails, the method throws an
`IllegalArgumentException`.
If, after possible unwrapping, the new value cannot be
converted to the type of the underlying field by an identity or
widening conversion, the method throws an
`IllegalArgumentException`.
If the underlying field is static, the class that declared the
field is initialized if it has not already been initialized.
The field is set to the possibly unwrapped and widened new value.
If the field is hidden in the type of `obj`,
the field's value is set according to the preceding rules.
| Parameters ||
|---|---|
| `obj` | `Object`: the object whose field should be modified
|
| `value` | `Object`: the new value for the field of `obj` being modified
|
| Throws ||
|---|---|
| `https://developer.android.com/reference/java/lang/ExceptionInInitializerError` | if the initialization provoked by this method fails. |
| `https://developer.android.com/reference/java/lang/IllegalAccessException` | if this `Field` object is enforcing Java language access control and the underlying field is either inaccessible or final. |
| `https://developer.android.com/reference/java/lang/IllegalArgumentException` | if the specified object is not an instance of the class or interface declaring the underlying field (or a subclass or implementor thereof), or if an unwrapping conversion fails. |
| `https://developer.android.com/reference/java/lang/NullPointerException` | if the specified object is null and the field is an instance field. |
### setBoolean
Added in [API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
```
public void setBoolean (Object obj,
boolean z)
```
Sets the value of a field as a `boolean` on the specified object.
This method is equivalent to
`set(obj, zObj)`,
where `zObj` is a `Boolean` object and
`zObj.booleanValue() == z`.
| Parameters ||
|---|---|
| `obj` | `Object`: the object whose field should be modified
|
| `z` | `boolean`: the new value for the field of `obj` being modified
|
| Throws ||
|---|---|
| `https://developer.android.com/reference/java/lang/ExceptionInInitializerError` | if the initialization provoked by this method fails. |
| `https://developer.android.com/reference/java/lang/IllegalAccessException` | if this `Field` object is enforcing Java language access control and the underlying field is either inaccessible or final. |
| `https://developer.android.com/reference/java/lang/IllegalArgumentException` | if the specified object is not an instance of the class or interface declaring the underlying field (or a subclass or implementor thereof), or if an unwrapping conversion fails. |
| `https://developer.android.com/reference/java/lang/NullPointerException` | if the specified object is null and the field is an instance field. |
**See also:**
- `https://developer.android.com/reference/java/lang/reflect/Field#set(java.lang.Object,%20java.lang.Object)`
### setByte
Added in [API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
```
public void setByte (Object obj,
byte b)
```
Sets the value of a field as a `byte` on the specified object.
This method is equivalent to
`set(obj, bObj)`,
where `bObj` is a `Byte` object and
`bObj.byteValue() == b`.
| Parameters ||
|---|---|
| `obj` | `Object`: the object whose field should be modified
|
| `b` | `byte`: the new value for the field of `obj` being modified
|
| Throws ||
|---|---|
| `https://developer.android.com/reference/java/lang/ExceptionInInitializerError` | if the initialization provoked by this method fails. |
| `https://developer.android.com/reference/java/lang/IllegalAccessException` | if this `Field` object is enforcing Java language access control and the underlying field is either inaccessible or final. |
| `https://developer.android.com/reference/java/lang/IllegalArgumentException` | if the specified object is not an instance of the class or interface declaring the underlying field (or a subclass or implementor thereof), or if an unwrapping conversion fails. |
| `https://developer.android.com/reference/java/lang/NullPointerException` | if the specified object is null and the field is an instance field. |
**See also:**
- `https://developer.android.com/reference/java/lang/reflect/Field#set(java.lang.Object,%20java.lang.Object)`
### setChar
Added in [API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
```
public void setChar (Object obj,
char c)
```
Sets the value of a field as a `char` on the specified object.
This method is equivalent to
`set(obj, cObj)`,
where `cObj` is a `Character` object and
`cObj.charValue() == c`.
| Parameters ||
|---|---|
| `obj` | `Object`: the object whose field should be modified
|
| `c` | `char`: the new value for the field of `obj` being modified
|
| Throws ||
|---|---|
| `https://developer.android.com/reference/java/lang/ExceptionInInitializerError` | if the initialization provoked by this method fails. |
| `https://developer.android.com/reference/java/lang/IllegalAccessException` | if this `Field` object is enforcing Java language access control and the underlying field is either inaccessible or final. |
| `https://developer.android.com/reference/java/lang/IllegalArgumentException` | if the specified object is not an instance of the class or interface declaring the underlying field (or a subclass or implementor thereof), or if an unwrapping conversion fails. |
| `https://developer.android.com/reference/java/lang/NullPointerException` | if the specified object is null and the field is an instance field. |
**See also:**
- `https://developer.android.com/reference/java/lang/reflect/Field#set(java.lang.Object,%20java.lang.Object)`
### setDouble
Added in [API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
```
public void setDouble (Object obj,
double d)
```
Sets the value of a field as a `double` on the specified object.
This method is equivalent to
`set(obj, dObj)`,
where `dObj` is a `Double` object and
`dObj.doubleValue() == d`.
| Parameters ||
|---|---|
| `obj` | `Object`: the object whose field should be modified
|
| `d` | `double`: the new value for the field of `obj` being modified
|
| Throws ||
|---|---|
| `https://developer.android.com/reference/java/lang/ExceptionInInitializerError` | if the initialization provoked by this method fails. |
| `https://developer.android.com/reference/java/lang/IllegalAccessException` | if this `Field` object is enforcing Java language access control and the underlying field is either inaccessible or final. |
| `https://developer.android.com/reference/java/lang/IllegalArgumentException` | if the specified object is not an instance of the class or interface declaring the underlying field (or a subclass or implementor thereof), or if an unwrapping conversion fails. |
| `https://developer.android.com/reference/java/lang/NullPointerException` | if the specified object is null and the field is an instance field. |
**See also:**
- `https://developer.android.com/reference/java/lang/reflect/Field#set(java.lang.Object,%20java.lang.Object)`
### setFloat
Added in [API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
```
public void setFloat (Object obj,
float f)
```
Sets the value of a field as a `float` on the specified object.
This method is equivalent to
`set(obj, fObj)`,
where `fObj` is a `Float` object and
`fObj.floatValue() == f`.
| Parameters ||
|---|---|
| `obj` | `Object`: the object whose field should be modified
|
| `f` | `float`: the new value for the field of `obj` being modified
|
| Throws ||
|---|---|
| `https://developer.android.com/reference/java/lang/ExceptionInInitializerError` | if the initialization provoked by this method fails. |
| `https://developer.android.com/reference/java/lang/IllegalAccessException` | if this `Field` object is enforcing Java language access control and the underlying field is either inaccessible or final. |
| `https://developer.android.com/reference/java/lang/IllegalArgumentException` | if the specified object is not an instance of the class or interface declaring the underlying field (or a subclass or implementor thereof), or if an unwrapping conversion fails. |
| `https://developer.android.com/reference/java/lang/NullPointerException` | if the specified object is null and the field is an instance field. |
**See also:**
- `https://developer.android.com/reference/java/lang/reflect/Field#set(java.lang.Object,%20java.lang.Object)`
### setInt
Added in [API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
```
public void setInt (Object obj,
int i)
```
Sets the value of a field as an `int` on the specified object.
This method is equivalent to
`set(obj, iObj)`,
where `iObj` is a `Integer` object and
`iObj.intValue() == i`.
| Parameters ||
|---|---|
| `obj` | `Object`: the object whose field should be modified
|
| `i` | `int`: the new value for the field of `obj` being modified
|
| Throws ||
|---|---|
| `https://developer.android.com/reference/java/lang/ExceptionInInitializerError` | if the initialization provoked by this method fails. |
| `https://developer.android.com/reference/java/lang/IllegalAccessException` | if this `Field` object is enforcing Java language access control and the underlying field is either inaccessible or final. |
| `https://developer.android.com/reference/java/lang/IllegalArgumentException` | if the specified object is not an instance of the class or interface declaring the underlying field (or a subclass or implementor thereof), or if an unwrapping conversion fails. |
| `https://developer.android.com/reference/java/lang/NullPointerException` | if the specified object is null and the field is an instance field. |
**See also:**
- `https://developer.android.com/reference/java/lang/reflect/Field#set(java.lang.Object,%20java.lang.Object)`
### setLong
Added in [API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
```
public void setLong (Object obj,
long l)
```
Sets the value of a field as a `long` on the specified object.
This method is equivalent to
`set(obj, lObj)`,
where `lObj` is a `Long` object and
`lObj.longValue() == l`.
| Parameters ||
|---|---|
| `obj` | `Object`: the object whose field should be modified
|
| `l` | `long`: the new value for the field of `obj` being modified
|
| Throws ||
|---|---|
| `https://developer.android.com/reference/java/lang/ExceptionInInitializerError` | if the initialization provoked by this method fails. |
| `https://developer.android.com/reference/java/lang/IllegalAccessException` | if this `Field` object is enforcing Java language access control and the underlying field is either inaccessible or final. |
| `https://developer.android.com/reference/java/lang/IllegalArgumentException` | if the specified object is not an instance of the class or interface declaring the underlying field (or a subclass or implementor thereof), or if an unwrapping conversion fails. |
| `https://developer.android.com/reference/java/lang/NullPointerException` | if the specified object is null and the field is an instance field. |
**See also:**
- `https://developer.android.com/reference/java/lang/reflect/Field#set(java.lang.Object,%20java.lang.Object)`
### setShort
Added in [API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
```
public void setShort (Object obj,
short s)
```
Sets the value of a field as a `short` on the specified object.
This method is equivalent to
`set(obj, sObj)`,
where `sObj` is a `Short` object and
`sObj.shortValue() == s`.
| Parameters ||
|---|---|
| `obj` | `Object`: the object whose field should be modified
|
| `s` | `short`: the new value for the field of `obj` being modified
|
| Throws ||
|---|---|
| `https://developer.android.com/reference/java/lang/ExceptionInInitializerError` | if the initialization provoked by this method fails. |
| `https://developer.android.com/reference/java/lang/IllegalAccessException` | if this `Field` object is enforcing Java language access control and the underlying field is either inaccessible or final. |
| `https://developer.android.com/reference/java/lang/IllegalArgumentException` | if the specified object is not an instance of the class or interface declaring the underlying field (or a subclass or implementor thereof), or if an unwrapping conversion fails. |
| `https://developer.android.com/reference/java/lang/NullPointerException` | if the specified object is null and the field is an instance field. |
**See also:**
- `https://developer.android.com/reference/java/lang/reflect/Field#set(java.lang.Object,%20java.lang.Object)`
### toGenericString
Added in [API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
```
public String toGenericString ()
```
Returns a string describing this `Field`, including
its generic type. The format is the access modifiers for the
field, if any, followed by the generic field type, followed by
a space, followed by the fully-qualified name of the class
declaring the field, followed by a period, followed by the name
of the field.
The modifiers are placed in canonical order as specified by
"The Java Language Specification". This is `public`,
`protected` or `private` first, and then other
modifiers in the following order: `static`, `final`,
`transient`, `volatile`.
| Returns ||
|---|---|
| `https://developer.android.com/reference/java/lang/String` | a string describing this `Field`, including its generic type
|
### toString
Added in [API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
```
public String toString ()
```
Returns a string describing this `Field`. The format is
the access modifiers for the field, if any, followed
by the field type, followed by a space, followed by
the fully-qualified name of the class declaring the field,
followed by a period, followed by the name of the field.
For example:
```
public static final int java.lang.Thread.MIN_PRIORITY
private int java.io.FileDescriptor.fd
```
The modifiers are placed in canonical order as specified by
"The Java Language Specification". This is `public`,
`protected` or `private` first, and then other
modifiers in the following order: `static`, `final`,
`transient`, `volatile`.
| Returns ||
|---|---|
| `https://developer.android.com/reference/java/lang/String` | a string describing this `Field`
|