Added in API level 1

Field

class Field : AccessibleObject, Member

kotlin.Any
↳	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.

Summary

Inherited constants

From class Member

Int

DECLARED

Identifies the set of declared members of a class or interface. Inherited members are not included.

Int

PUBLIC

Identifies the set of all public members of a class or interface, including inherited members.

Public methods
Boolean	`equals(other: Any?)` Compares this `Field` against the specified object.
Any?	`get(obj: Any?)` Returns the value of the field represented by this `Field`, on the specified object.
T?	`getAnnotation(annotationClass: Class<T>)`
Array<T>!	`getAnnotationsByType(annotationClass: Class<T>)` Returns annotations that are associated with this element.
Boolean	`getBoolean(obj: Any?)` Gets the value of a static or instance `boolean` field.
Byte	`getByte(obj: Any?)` Gets the value of a static or instance `byte` field.
Char	`getChar(obj: Any?)` 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.
Array<Annotation!>	`getDeclaredAnnotations()` Returns annotations that are directly present on this element.
Class<*>	`getDeclaringClass()` Returns the `Class` object representing the class or interface that declares the field represented by this `Field` object.
Double	`getDouble(obj: Any?)` 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	`getFloat(obj: Any?)` 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.
Type	`getGenericType()` Returns a `Type` object that represents the declared type for the field represented by this `Field` object.
Int	`getInt(obj: Any?)` 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	`getLong(obj: Any?)` 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	`getModifiers()` Returns the Java language modifiers for the field represented by this `Field` object, as an integer.
String	`getName()` Returns the name of the field represented by this `Field` object.
Short	`getShort(obj: Any?)` 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.
Class<*>	`getType()` Returns a `Class` object that identifies the declared type for the field represented by this `Field` object.
Int	`hashCode()` Returns a hashcode for this `Field`.
Boolean	`isAnnotationPresent(annotationType: Class<out Annotation!>)`
Boolean	`isEnumConstant()` Returns `true` if this field represents an element of an enumerated type; returns `false` otherwise.
Boolean	`isSynthetic()` Returns `true` if this field is a synthetic field; returns `false` otherwise.
Unit	`set(obj: Any?, value: Any?)` Sets the field represented by this `Field` object on the specified object argument to the specified new value.
Unit	`setBoolean(obj: Any?, z: Boolean)` Sets the value of a field as a `boolean` on the specified object.
Unit	`setByte(obj: Any?, b: Byte)` Sets the value of a field as a `byte` on the specified object.
Unit	`setChar(obj: Any?, c: Char)` Sets the value of a field as a `char` on the specified object.
Unit	`setDouble(obj: Any?, d: Double)` Sets the value of a field as a `double` on the specified object.
Unit	`setFloat(obj: Any?, f: Float)` Sets the value of a field as a `float` on the specified object.
Unit	`setInt(obj: Any?, i: Int)` Sets the value of a field as an `int` on the specified object.
Unit	`setLong(obj: Any?, l: Long)` Sets the value of a field as a `long` on the specified object.
Unit	`setShort(obj: Any?, s: Short)` Sets the value of a field as a `short` on the specified object.
String	`toGenericString()` Returns a string describing this `Field`, including its generic type.
String	`toString()` Returns a string describing this `Field`.

Inherited functions

From class AccessibleObject

`Array<Annotation!>`	`getAnnotations()`
`T?`	`getDeclaredAnnotation(annotationClass: Class<T>)`
`Array<T>!`	`getDeclaredAnnotationsByType(annotationClass: Class<T>)`
`Boolean`	`isAccessible()` Get the value of the `accessible` flag for this object.
`Unit`	`setAccessible(flag: Boolean)` Set the `accessible` flag for this object to the indicated boolean value. A value of `true` indicates that the reflected object should suppress Java language access checking when it is used. A value of `false` indicates that the reflected object should enforce Java language access checks. First, if there is a security manager, its `checkPermission` method is called with a `ReflectPermission("suppressAccessChecks")` permission. A `SecurityException` is raised if `flag` is `true` but accessibility of this object may not be changed (for example, if this element object is a `Constructor` object for the class `java.lang.Class`). A `SecurityException` is raised if this object is a object for the class `java.lang.Class`, and `flag` is true.
`Unit`	`setAccessible(array: Array<AccessibleObject!>!, flag: Boolean)` Convenience method to set the `accessible` flag for an array of objects with a single security check (for efficiency). First, if there is a security manager, its `checkPermission` method is called with a `ReflectPermission("suppressAccessChecks")` permission. A `SecurityException` is raised if `flag` is `true` but accessibility of any of the elements of the input `array` may not be changed (for example, if the element object is a `Constructor` object for the class ). In the event of such a SecurityException, the accessibility of objects is set to `flag` for array elements upto (and excluding) the element for which the exception occurred; the accessibility of elements beyond (and including) the element for which the exception occurred is unchanged.

Public methods

equals

Added in API level 1

fun equals(other: Any?): Boolean

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`	the reference object with which to compare.

Return
`Boolean`	`true` if this object is the same as the obj argument; `false` otherwise.

get

Added in API level 1

fun get(obj: Any?): Any?

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`	Any?: object from which the represented field's value is to be extracted

Return
`Any?`	the value of the represented field in object `obj`; primitive values are wrapped in an appropriate object before being returned

Exceptions
`java.lang.IllegalAccessException`	if this `Field` object is enforcing Java language access control and the underlying field is inaccessible.
`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).
`java.lang.NullPointerException`	if the specified object is null and the field is an instance field.
`java.lang.ExceptionInInitializerError`	if the initialization provoked by this method fails.

getAnnotation

Added in API level 1

fun <T : Annotation!> getAnnotation(annotationClass: Class<T>): T?

Parameters
`<T>`	the type of the annotation to query for and return if present
`annotationClass`	Class<T>: the Class object corresponding to the annotation type

Return
`T?`	this element's annotation for the specified annotation type if present on this element, else null

Exceptions
`java.lang.NullPointerException`	if the given annotation class is null

getAnnotationsByType

Added in API level 24

fun <T : Annotation!> getAnnotationsByType(annotationClass: Class<T>): Array<T>!

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 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
`<T>`	the type of the annotation to query for and return if present
`annotationClass`	Class<T>: the Class object corresponding to the annotation type

Return
`Array<T>!`	all this element's annotations for the specified annotation type if associated with this element, else an array of length zero

Exceptions
`java.lang.NullPointerException`	if the given annotation class is null

getBoolean

Added in API level 1

fun getBoolean(obj: Any?): Boolean

Gets the value of a static or instance boolean field.

Parameters
`obj`	Any?: the object to extract the `boolean` value from

Return
`Boolean`	the value of the `boolean` field

Exceptions
`java.lang.IllegalAccessException`	if this `Field` object is enforcing Java language access control and the underlying field is inaccessible.
`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.
`java.lang.NullPointerException`	if the specified object is null and the field is an instance field.
`java.lang.ExceptionInInitializerError`	if the initialization provoked by this method fails.

See Also

java.lang.reflect.Field#get

getByte

Added in API level 1

fun getByte(obj: Any?): Byte

Gets the value of a static or instance byte field.

Parameters
`obj`	Any?: the object to extract the `byte` value from

Return
`Byte`	the value of the `byte` field

Exceptions
`java.lang.IllegalAccessException`	if this `Field` object is enforcing Java language access control and the underlying field is inaccessible.
`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.
`java.lang.NullPointerException`	if the specified object is null and the field is an instance field.
`java.lang.ExceptionInInitializerError`	if the initialization provoked by this method fails.

See Also

java.lang.reflect.Field#get

getChar

Added in API level 1

fun getChar(obj: Any?): Char

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`	Any?: the object to extract the `char` value from

Return
`Char`	the value of the field converted to type `char`

Exceptions
`java.lang.IllegalAccessException`	if this `Field` object is enforcing Java language access control and the underlying field is inaccessible.
`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.
`java.lang.NullPointerException`	if the specified object is null and the field is an instance field.
`java.lang.ExceptionInInitializerError`	if the initialization provoked by this method fails.

See Also

java.lang.reflect.Field#get

getDeclaredAnnotations

Added in API level 1

fun getDeclaredAnnotations(): Array<Annotation!>

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.

Return
`Array<Annotation!>`	annotations directly present on this element

getDeclaringClass

Added in API level 1

fun getDeclaringClass(): Class<*>

Returns the Class object representing the class or interface that declares the field represented by this Field object.

Return
`Class<*>`	an object representing the declaring class of the underlying member

getDouble

Added in API level 1

fun getDouble(obj: Any?): Double

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`	Any?: the object to extract the `double` value from

Return
`Double`	the value of the field converted to type `double`

Exceptions
`java.lang.IllegalAccessException`	if this `Field` object is enforcing Java language access control and the underlying field is inaccessible.
`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.
`java.lang.NullPointerException`	if the specified object is null and the field is an instance field.
`java.lang.ExceptionInInitializerError`	if the initialization provoked by this method fails.

See Also

java.lang.reflect.Field#get

getFloat

Added in API level 1

fun getFloat(obj: Any?): Float

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`	Any?: the object to extract the `float` value from

Return
`Float`	the value of the field converted to type `float`

Exceptions
`java.lang.IllegalAccessException`	if this `Field` object is enforcing Java language access control and the underlying field is inaccessible.
`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.
`java.lang.NullPointerException`	if the specified object is null and the field is an instance field.
`java.lang.ExceptionInInitializerError`	if the initialization provoked by this method fails.

See Also

java.lang.reflect.Field#get

getGenericType

Added in API level 1

fun getGenericType(): Type

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.

Return
`Type`	a `Type` object that represents the declared type for the field represented by this `Field` object

Exceptions
`java.lang.reflect.GenericSignatureFormatError`	if the generic field signature does not conform to the format specified in The Java™ Virtual Machine Specification
`java.lang.TypeNotPresentException`	if the generic type signature of the underlying field refers to a non-existent type declaration
`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

fun getInt(obj: Any?): Int

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`	Any?: the object to extract the `int` value from

Return
`Int`	the value of the field converted to type `int`

Exceptions
`java.lang.IllegalAccessException`	if this `Field` object is enforcing Java language access control and the underlying field is inaccessible.
`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.
`java.lang.NullPointerException`	if the specified object is null and the field is an instance field.
`java.lang.ExceptionInInitializerError`	if the initialization provoked by this method fails.

See Also

java.lang.reflect.Field#get

getLong

Added in API level 1

fun getLong(obj: Any?): Long

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`	Any?: the object to extract the `long` value from

Return
`Long`	the value of the field converted to type `long`

Exceptions
`java.lang.IllegalAccessException`	if this `Field` object is enforcing Java language access control and the underlying field is inaccessible.
`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.
`java.lang.NullPointerException`	if the specified object is null and the field is an instance field.
`java.lang.ExceptionInInitializerError`	if the initialization provoked by this method fails.

See Also

java.lang.reflect.Field#get

getModifiers

Added in API level 1

fun getModifiers(): Int

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.

Return
`Int`	the Java language modifiers for the underlying member

See Also

java.lang.reflect.Modifier

getName

Added in API level 1

fun getName(): String

Returns the name of the field represented by this Field object.

Return
`String`	the simple name of the underlying member

getShort

Added in API level 1

fun getShort(obj: Any?): Short

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`	Any?: the object to extract the `short` value from

Return
`Short`	the value of the field converted to type `short`

Exceptions
`java.lang.IllegalAccessException`	if this `Field` object is enforcing Java language access control and the underlying field is inaccessible.
`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.
`java.lang.NullPointerException`	if the specified object is null and the field is an instance field.
`java.lang.ExceptionInInitializerError`	if the initialization provoked by this method fails.

See Also

java.lang.reflect.Field#get

getType

Added in API level 1

fun getType(): Class<*>

Returns a Class object that identifies the declared type for the field represented by this Field object.

Return
`Class<*>`	a `Class` object identifying the declared type of the field represented by this object

hashCode

Added in API level 1

fun hashCode(): Int

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.

Return
`Int`	a hash code value for this object.

isAnnotationPresent

Added in API level 1

fun isAnnotationPresent(annotationType: Class<out Annotation!>): Boolean

Parameters
`annotationClass`	the Class object corresponding to the annotation type

Return
`Boolean`	true if an annotation for the specified annotation type is present on this element, else false

Exceptions
`java.lang.NullPointerException`	if the given annotation class is null

isEnumConstant

Added in API level 1

fun isEnumConstant(): Boolean

Returns true if this field represents an element of an enumerated type; returns false otherwise.

Return
`Boolean`	`true` if and only if this field represents an element of an enumerated type.

isSynthetic

Added in API level 1

fun isSynthetic(): Boolean

Returns true if this field is a synthetic field; returns false otherwise.

Return
`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

fun set(
    obj: Any?, 
    value: Any?
): Unit

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:

setAccessible(true) has succeeded for this Field object;
the field is non-static; and
the field's declaring class is not a record class.

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`	Any?: the object whose field should be modified
`value`	Any?: the new value for the field of `obj` being modified

Exceptions
`java.lang.IllegalAccessException`	if this `Field` object is enforcing Java language access control and the underlying field is either inaccessible or final.
`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.
`java.lang.NullPointerException`	if the specified object is null and the field is an instance field.
`java.lang.ExceptionInInitializerError`	if the initialization provoked by this method fails.

setBoolean

Added in API level 1

fun setBoolean(
    obj: Any?, 
    z: Boolean
): Unit

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`	Any?: the object whose field should be modified
`z`	Boolean: the new value for the field of `obj` being modified

Exceptions
`java.lang.IllegalAccessException`	if this `Field` object is enforcing Java language access control and the underlying field is either inaccessible or final.
`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.
`java.lang.NullPointerException`	if the specified object is null and the field is an instance field.
`java.lang.ExceptionInInitializerError`	if the initialization provoked by this method fails.

See Also

java.lang.reflect.Field#set

setByte

Added in API level 1

fun setByte(
    obj: Any?, 
    b: Byte
): Unit

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`	Any?: the object whose field should be modified
`b`	Byte: the new value for the field of `obj` being modified

Exceptions
`java.lang.IllegalAccessException`	if this `Field` object is enforcing Java language access control and the underlying field is either inaccessible or final.
`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.
`java.lang.NullPointerException`	if the specified object is null and the field is an instance field.
`java.lang.ExceptionInInitializerError`	if the initialization provoked by this method fails.

See Also

java.lang.reflect.Field#set

setChar

Added in API level 1

fun setChar(
    obj: Any?, 
    c: Char
): Unit

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`	Any?: the object whose field should be modified
`c`	Char: the new value for the field of `obj` being modified

Exceptions
`java.lang.IllegalAccessException`	if this `Field` object is enforcing Java language access control and the underlying field is either inaccessible or final.
`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.
`java.lang.NullPointerException`	if the specified object is null and the field is an instance field.
`java.lang.ExceptionInInitializerError`	if the initialization provoked by this method fails.

See Also

java.lang.reflect.Field#set

setDouble

Added in API level 1

fun setDouble(
    obj: Any?, 
    d: Double
): Unit

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`	Any?: the object whose field should be modified
`d`	Double: the new value for the field of `obj` being modified

Exceptions
`java.lang.IllegalAccessException`	if this `Field` object is enforcing Java language access control and the underlying field is either inaccessible or final.
`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.
`java.lang.NullPointerException`	if the specified object is null and the field is an instance field.
`java.lang.ExceptionInInitializerError`	if the initialization provoked by this method fails.

See Also

java.lang.reflect.Field#set

setFloat

Added in API level 1

fun setFloat(
    obj: Any?, 
    f: Float
): Unit

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`	Any?: the object whose field should be modified
`f`	Float: the new value for the field of `obj` being modified

Exceptions
`java.lang.IllegalAccessException`	if this `Field` object is enforcing Java language access control and the underlying field is either inaccessible or final.
`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.
`java.lang.NullPointerException`	if the specified object is null and the field is an instance field.
`java.lang.ExceptionInInitializerError`	if the initialization provoked by this method fails.

See Also

java.lang.reflect.Field#set

setInt

Added in API level 1

fun setInt(
    obj: Any?, 
    i: Int
): Unit

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`	Any?: the object whose field should be modified
`i`	Int: the new value for the field of `obj` being modified

Exceptions
`java.lang.IllegalAccessException`	if this `Field` object is enforcing Java language access control and the underlying field is either inaccessible or final.
`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.
`java.lang.NullPointerException`	if the specified object is null and the field is an instance field.
`java.lang.ExceptionInInitializerError`	if the initialization provoked by this method fails.

See Also

java.lang.reflect.Field#set

setLong

Added in API level 1

fun setLong(
    obj: Any?, 
    l: Long
): Unit

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`	Any?: the object whose field should be modified
`l`	Long: the new value for the field of `obj` being modified

Exceptions
`java.lang.IllegalAccessException`	if this `Field` object is enforcing Java language access control and the underlying field is either inaccessible or final.
`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.
`java.lang.NullPointerException`	if the specified object is null and the field is an instance field.
`java.lang.ExceptionInInitializerError`	if the initialization provoked by this method fails.

See Also

java.lang.reflect.Field#set

setShort

Added in API level 1

fun setShort(
    obj: Any?, 
    s: Short
): Unit

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`	Any?: the object whose field should be modified
`s`	Short: the new value for the field of `obj` being modified

Exceptions
`java.lang.IllegalAccessException`	if this `Field` object is enforcing Java language access control and the underlying field is either inaccessible or final.
`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.
`java.lang.NullPointerException`	if the specified object is null and the field is an instance field.
`java.lang.ExceptionInInitializerError`	if the initialization provoked by this method fails.

See Also

java.lang.reflect.Field#set

toGenericString

Added in API level 1

fun toGenericString(): String

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.

Return
`String`	a string describing this `Field`, including its generic type

toString

Added in API level 1

fun toString(): String

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

Return
`String`	a string describing this `Field`