Java Swing 面试题与答案
问题 16. Which method of the Component class is used to set the position and size of a component?
setBounds Method of the Component class is used to set the position and size of a component.
问题 17. What is the What is the difference between invokeAndWait() and invokeLater()?
invokeAndWait() method in swing is synchronous. It blocks until Runnable task is complete. InvokeLater() method in swing is asynchronous. It posts an action event to the event queue and returns immediately. It will not wait for the task to complete.
问题 18. Why should any swing call back implementation execute quickly?
Callbacks are invoked by the event dispatch thread. Event dispatch thread blocks processing of other events as long as call back method executes.
问题 19. What is an applet?
Applet is a java program that runs inside a web browser.
问题 20. What is the difference between applications and applets?
Application must be run explicitly within Java Virtual Machine whereas applet loads and runs itself automatically in a java-enabled browser. Application starts execution with its main method whereas applet starts execution with its init method. Application can run with or without graphical user interface whereas applet must run within a graphical user interface. In order to run an applet we need a java enabled web browser or an appletviewer.
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