Class HeadlessException
java.lang.Object
java.lang.Throwable
java.lang.Exception
java.lang.RuntimeException
java.lang.UnsupportedOperationException
java.awt.HeadlessException
- All Implemented Interfaces:
Serializable
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:
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Constructor Summary
ConstructorDescriptionConstructs newHeadlessException
with empty message.HeadlessException
(String msg) Create a new instance with the specified detailed error message. -
Method Summary
Modifier and TypeMethodDescriptionReturns the detail message string of thisHeadlessException
.Methods declared in class java.lang.Throwable
addSuppressed, fillInStackTrace, getCause, getLocalizedMessage, getStackTrace, getSuppressed, initCause, printStackTrace, printStackTrace, printStackTrace, setStackTrace, toString
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Constructor Details
-
HeadlessException
public HeadlessException()Constructs newHeadlessException
with empty message. For suchHeadlessException
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
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
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Method Details
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getMessage
Returns the detail message string of thisHeadlessException
. 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 classThrowable
- Returns:
- the detail message string of this
HeadlessException
instance (which may benull
).
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