Java Module java.desktop Package java.awt Class HeadlessException（JDK11）

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java.lang.Object
- java.lang.Throwable
- - java.lang.Exception
  - - java.lang.RuntimeException
    - - java.lang.UnsupportedOperationException
      - java.awt.HeadlessException

All Implemented Interfaces:

Serializable
```
public class HeadlessException
extends UnsupportedOperationException
```
Thrown when code that is dependent on a keyboard, display, or mouse is called in an environment that does not support a keyboard, display, or mouse. Any code that depends on any of those devices should firstly ensure their availability using the GraphicsEnvironment.isHeadless() method and throw HeadlessException if the latter returns true.

Since:

1.4

See Also:

GraphicsEnvironment.isHeadless(), Serialized Form

Constructor Summary

Constructors
Constructor	Description
`HeadlessException()`	Constructs new `HeadlessException` with empty message.
`HeadlessException(String msg)`	Create a new instance with the specified detailed error message.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`String`	`getMessage()`	Returns the detail message string of this `HeadlessException`.

Methods declared in class java.lang.Throwable
addSuppressed, fillInStackTrace, getCause, getLocalizedMessage, getStackTrace, getSuppressed, initCause, printStackTrace, printStackTrace, printStackTrace, setStackTrace, toString

Methods declared in class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

- Constructor Detail
  - HeadlessException
```
public HeadlessException()
```
    Constructs new HeadlessException with empty message. For such HeadlessException the default headless error message may be auto-generated for some platforms. The text of the default headless message may depend on whether the GraphicsEnvironment is in fact headless. That is, the default headless message is both system and environmentally dependent.
  - HeadlessException
```
public HeadlessException(String msg)
```
    Create a new instance with the specified detailed error message. For some platforms the default headless error message may be added at the end of the specified message. The text of the default headless message may depend on whether the GraphicsEnvironment is in fact headless. That is, the default headless message is both system and environmentally dependent.
    
    Parameters:
    
    msg - the error message
- Method Detail
  - getMessage
```
public String getMessage()
```
    Returns the detail message string of this HeadlessException. Depending on the platform the message specified in the constructor may be followed by the default headless error message. The text of the default headless message may depend on whether the GraphicsEnvironment is in fact headless. That is, the default headless message is both system and environmentally dependent.
    
    Overrides:
    
    getMessage in class Throwable
    
    Returns:
    
    the detail message string of this HeadlessException instance (which may be null).

Java Module java.desktop Package java.awt Class HeadlessException（JDK11）

Class HeadlessException

Constructor Summary

Method Summary

Methods declared in class java.lang.Throwable

Methods declared in class java.lang.Object

Constructor Detail

HeadlessException

HeadlessException

Method Detail

getMessage