screensaver.java

来自「32个java程序源代码」· Java 代码 · 共 61 行

// Exercise 27.11: ScreenSaver.java
// Application simulates a Screen Saver by drawing random shapes.
import java.awt.*;
import javax.swing.*;

public class ScreenSaver extends JFrame
{
   // DrawJPanel for displaying shapes
   private DrawJPanel shapesDrawJPanel;

   // no-argument constructor
   public ScreenSaver()
   {
      createUserInterface();
   }

   // create and position GUI components; register event handlers
   private void createUserInterface()
   {
      // get content pane for attaching GUI components
      Container contentPane = getContentPane();

      // enable explicit positioning of GUI components 
      contentPane.setLayout( null );
      
      // set up shapesDrawJPanel
      shapesDrawJPanel = new DrawJPanel();
      shapesDrawJPanel.setBounds( 0, 0, 600, 450 );
      contentPane.add( shapesDrawJPanel );

      // set properties of application's window
      setTitle( "Screen Saver" ); // set title bar string
      setSize( 600, 450 );        // set window size
      setVisible( true );         // display window

   } // end method createUserInterface

   // main method
   public static void main( String[] args )
   {
      ScreenSaver application = new ScreenSaver();
      application.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );

   } // end method main

} // end class ScreenSaver

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