Get the default toolkit.
If the system property named "java.awt.headless" is set to true, the headless implementation of Toolkit is used.
If there is no "java.awt.headless" or "java.awt.headless" set to false, and there is a system attribute named "awt". Toolkit ",then this attribute will be regarded as the name of the toolkit subclass; Otherwise, the platform-specific default toolkit implementation will be used.
You can also load other classes into the VM using the property "assistive_technologies" specified in the Sun reference implementation, which is specified in a line of the "accessibility.properties" file. The form is "assistive_technologies= ...", where "..." A comma-separated list of assistive technology classes to be loaded. Each class is loaded in the given order, and a separate instance of each class is created using class. Forname (class) newinstance()。 This was done after the AWT toolkit was created. All errors are handled through AWTError exceptions.
Return:
Default toolkit.
Throwing:
AW Error-If the toolbox cannot be found or cannot be accessed or instantiated.