Extending JFrame: Closing Frames by Default : JFrame Window « Swing « Java Tutorial

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Java Tutorial » Swing » JFrame Window

14. 80. 7. Extending JFrame: Closing Frames by Default

When extending JFrame, this class has two important protected methods:


protected void frameInit()

protected JRootPane createRootPane()

Extending JFrame: Closing Frames by Default


import javax.swing.JFrame;



class ExitableJFrame extends JFrame {

  public ExitableJFrame() {

  }



  public ExitableJFrame(String title) {

    super(title);

  }



  protected void frameInit() {

    super.frameInit();

    setDefaultCloseOperation(EXIT_ON_CLOSE);

  }

}



public class ExitableJFrameTest {



  public static void main(String[] a) {

    JFrame frame = new ExitableJFrame("Adornment Example");



    frame.setSize(300, 100);

    frame.setVisible(true);

  }



}

If you do override the frameInit() method of JFrame, remember to call super.frameInit() first, to initialize the default behaviors.

14. 80. JFrame Window
	14. 80. 1.	Creating a Window
	14. 80. 2.	Display a JFrame instance
	14. 80. 3.	Resizing and positioning a JFrame
	14. 80. 4.	Constants for JFrame window close action
	14. 80. 5.	Sizing Windows with Toolkit
	14. 80. 6.	Centering a Window
	14. 80. 7.	Extending JFrame: Closing Frames by Default
	14. 80. 8.	Exiting an Application When a JFrame Is Closed
	14. 80. 9.	JFrame with Label and Window Listener to Handle Closing the Frame
	14. 80. 10.	Handling JFrame Events
	14. 80. 11.	Specifying Window Decorations
	14. 80. 12.	Set Default window close operation
	14. 80. 13.	SetIconImages for JFrame
	14. 80. 14.	Creating a Titleless and Borderless JFrame
	14. 80. 15.	Close a JFrame under condition
	14. 80. 16.	Creating a Borderless Window
	14. 80. 17.	Creating Frames with a background image
	14. 80. 18.	Setting the Icon for a Frame
	14. 80. 19.	Getting All Created Frames in an Application
	14. 80. 20.	Removing the Title Bar of a Frame
	14. 80. 21.	Making a Frame Non-Resizable: use setResizable(false) to freeze a frame's size.
	14. 80. 22.	Use Component listener to ensure frame visibilities
	14. 80. 23.	Drag and move a frame from its content area
	14. 80. 24.	Disabling the Close Button on a JFrame
	14. 80. 25.	Maximize a JFrame
	14. 80. 26.	Make a JFrame always visible
	14. 80. 27.	Preventing a Window from Gaining the Focus
	14. 80. 28.	Getting the Child Components of a Container
	14. 80. 29.	Get Top Frame
	14. 80. 30.	Make a JInternalFrame a tool window
	14. 80. 31.	Move JInternalFrame To Front

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