Added in [API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels) Summary: [Ctors](https://developer.android.com/reference/java/lang/AssertionError#pubctors) \| [Inherited Methods](https://developer.android.com/reference/java/lang/AssertionError#inhmethods)
# AssertionError
` public class AssertionError `
` ` ` ` ` extends https://developer.android.com/reference/java/lang/Error ` ` `
|---|---|---|---|
| [java.lang.Object](https://developer.android.com/reference/java/lang/Object) ||||
| ↳ | [java.lang.Throwable](https://developer.android.com/reference/java/lang/Throwable) |||
| | ↳ | [java.lang.Error](https://developer.android.com/reference/java/lang/Error) ||
| | | ↳ | java.lang.AssertionError |
*** ** * ** ***
Thrown to indicate that an assertion has failed.
The seven one-argument public constructors provided by this class ensure that the assertion error returned by the invocation:
```
new AssertionError(expression)
```
has as its detail message the *string conversion* of *expression* (as defined in section {@jls 5.1.11} of The Java Language Specification), regardless of the type of *expression*.
## Summary
| ### Public constructors ||
|---|---|
| ` https://developer.android.com/reference/java/lang/AssertionError#AssertionError()() ` Constructs an AssertionError with no detail message. |
| ` https://developer.android.com/reference/java/lang/AssertionError#AssertionError(boolean)(boolean detailMessage) ` Constructs an AssertionError with its detail message derived from the specified `boolean`, which is converted to a string as defined in section {@jls 5.1.11} of The Java Language Specification. |
| ` https://developer.android.com/reference/java/lang/AssertionError#AssertionError(char)(char detailMessage) ` Constructs an AssertionError with its detail message derived from the specified `char`, which is converted to a string as defined in section {@jls 5.1.11} of The Java Language Specification. |
| ` https://developer.android.com/reference/java/lang/AssertionError#AssertionError(double)(double detailMessage) ` Constructs an AssertionError with its detail message derived from the specified `double`, which is converted to a string as defined in section {@jls 5.1.11} of The Java Language Specification. |
| ` https://developer.android.com/reference/java/lang/AssertionError#AssertionError(float)(float detailMessage) ` Constructs an AssertionError with its detail message derived from the specified `float`, which is converted to a string as defined in section {@jls 5.1.11} of The Java Language Specification. |
| ` https://developer.android.com/reference/java/lang/AssertionError#AssertionError(int)(int detailMessage) ` Constructs an AssertionError with its detail message derived from the specified `int`, which is converted to a string as defined in section {@jls 5.1.11} of The Java Language Specification. |
| ` https://developer.android.com/reference/java/lang/AssertionError#AssertionError(java.lang.Object)(https://developer.android.com/reference/java/lang/Object detailMessage) ` Constructs an AssertionError with its detail message derived from the specified object, which is converted to a string as defined in section {@jls 5.1.11} of The Java Language Specification. |
| ` https://developer.android.com/reference/java/lang/AssertionError#AssertionError(java.lang.String,%20java.lang.Throwable)(https://developer.android.com/reference/java/lang/String message, https://developer.android.com/reference/java/lang/Throwable cause) ` Constructs a new `AssertionError` with the specified detail message and cause. |
| ` https://developer.android.com/reference/java/lang/AssertionError#AssertionError(long)(long detailMessage) ` Constructs an AssertionError with its detail message derived from the specified `long`, which is converted to a string as defined in section {@jls 5.1.11} of The Java Language Specification. |
### Inherited methods
From class ` https://developer.android.com/reference/java/lang/Throwable ` ` final void` ` https://developer.android.com/reference/java/lang/Throwable#addSuppressed(java.lang.Throwable)(https://developer.android.com/reference/java/lang/Throwable exception) `
Appends the specified exception to the exceptions that were suppressed in order to deliver this exception.
` https://developer.android.com/reference/java/lang/Throwable` ` https://developer.android.com/reference/java/lang/Throwable#fillInStackTrace()() `
Fills in the execution stack trace.
` https://developer.android.com/reference/java/lang/Throwable` ` https://developer.android.com/reference/java/lang/Throwable#getCause()() `
Returns the cause of this throwable or `null` if the cause is nonexistent or unknown.
` https://developer.android.com/reference/java/lang/String` ` https://developer.android.com/reference/java/lang/Throwable#getLocalizedMessage()() `
Creates a localized description of this throwable.
` https://developer.android.com/reference/java/lang/String` ` https://developer.android.com/reference/java/lang/Throwable#getMessage()() `
Returns the detail message string of this throwable.
` https://developer.android.com/reference/java/lang/StackTraceElement` ` https://developer.android.com/reference/java/lang/Throwable#getStackTrace()() `
Provides programmatic access to the stack trace information printed by `https://developer.android.com/reference/java/lang/Throwable#printStackTrace()`.
` final https://developer.android.com/reference/java/lang/Throwable` ` https://developer.android.com/reference/java/lang/Throwable#getSuppressed()() `
Returns an array containing all of the exceptions that were suppressed, typically by the `try`-with-resources statement, in order to deliver this exception.
` https://developer.android.com/reference/java/lang/Throwable` ` https://developer.android.com/reference/java/lang/Throwable#initCause(java.lang.Throwable)(https://developer.android.com/reference/java/lang/Throwable cause) `
Initializes the *cause* of this throwable to the specified value.
` void` ` https://developer.android.com/reference/java/lang/Throwable#printStackTrace()() `
Prints this throwable and its backtrace to the standard error stream.
` void` ` https://developer.android.com/reference/java/lang/Throwable#printStackTrace(java.io.PrintWriter)(https://developer.android.com/reference/java/io/PrintWriter s) `
Prints this throwable and its backtrace to the specified print writer.
` void` ` https://developer.android.com/reference/java/lang/Throwable#printStackTrace(java.io.PrintStream)(https://developer.android.com/reference/java/io/PrintStream s) `
Prints this throwable and its backtrace to the specified print stream.
` void` ` https://developer.android.com/reference/java/lang/Throwable#setStackTrace(java.lang.StackTraceElement[])(https://developer.android.com/reference/java/lang/StackTraceElement stackTrace) `
Sets the stack trace elements that will be returned by `https://developer.android.com/reference/java/lang/Throwable#getStackTrace()` and printed by `https://developer.android.com/reference/java/lang/Throwable#printStackTrace()` and related methods.
` https://developer.android.com/reference/java/lang/String` ` https://developer.android.com/reference/java/lang/Throwable#toString()() `
Returns a short description of this throwable.
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*.
## Public constructors
### AssertionError
Added in [API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
```
public AssertionError ()
```
Constructs an AssertionError with no detail message.
### AssertionError
Added in [API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
```
public AssertionError (boolean detailMessage)
```
Constructs an AssertionError with its detail message derived from the specified `boolean`, which is converted to a string as defined in section {@jls 5.1.11} of The Java Language Specification.
| Parameters ||
|---|---|
| `detailMessage` | `boolean`: value to be used in constructing detail message
|
### AssertionError
Added in [API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
```
public AssertionError (char detailMessage)
```
Constructs an AssertionError with its detail message derived from the specified `char`, which is converted to a string as defined in section {@jls 5.1.11} of The Java Language Specification.
| Parameters ||
|---|---|
| `detailMessage` | `char`: value to be used in constructing detail message
|
### AssertionError
Added in [API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
```
public AssertionError (double detailMessage)
```
Constructs an AssertionError with its detail message derived from the specified `double`, which is converted to a string as defined in section {@jls 5.1.11} of The Java Language Specification.
| Parameters ||
|---|---|
| `detailMessage` | `double`: value to be used in constructing detail message
|
### AssertionError
Added in [API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
```
public AssertionError (float detailMessage)
```
Constructs an AssertionError with its detail message derived from the specified `float`, which is converted to a string as defined in section {@jls 5.1.11} of The Java Language Specification.
| Parameters ||
|---|---|
| `detailMessage` | `float`: value to be used in constructing detail message
|
### AssertionError
Added in [API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
```
public AssertionError (int detailMessage)
```
Constructs an AssertionError with its detail message derived from the specified `int`, which is converted to a string as defined in section {@jls 5.1.11} of The Java Language Specification.
| Parameters ||
|---|---|
| `detailMessage` | `int`: value to be used in constructing detail message
|
### AssertionError
Added in [API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
```
public AssertionError (Object detailMessage)
```
Constructs an AssertionError with its detail message derived from the specified object, which is converted to a string as defined in section {@jls 5.1.11} of The Java Language Specification.
If the specified object is an instance of `Throwable`, it becomes the *cause* of the newly constructed assertion error.
| Parameters ||
|---|---|
| `detailMessage` | `Object`: value to be used in constructing detail message
|
**See also:**
- `https://developer.android.com/reference/java/lang/Throwable#getCause()`
### AssertionError
Added in [API level 19](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
```
public AssertionError (String message,
Throwable cause)
```
Constructs a new `AssertionError` with the specified detail message and cause.
Note that the detail message associated with `cause` is *not* automatically incorporated in this error's detail message.
| Parameters ||
|---|---|
| `message` | `String`: the detail message, may be `null`
|
| `cause` | `Throwable`: the cause, may be `null`
|
### AssertionError
Added in [API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
```
public AssertionError (long detailMessage)
```
Constructs an AssertionError with its detail message derived from the specified `long`, which is converted to a string as defined in section {@jls 5.1.11} of The Java Language Specification.
| Parameters ||
|---|---|
| `detailMessage` | `long`: value to be used in constructing detail message
|