showcolors.java

这是一些JAVA的例子,很经典,值得一看.建议初学者来

 import java.awt.*;
 import javax.swing.*;
 import java.awt.event.*;

 public class ShowColors extends JFrame{
    public ShowColors(){
      super( "Using colors" );
      setSize( 400, 130 );
      show();
  }
  public void paint( Graphics g ){
  g.setColor( new Color( 255, 0, 0 ) );
  g.fillRect( 25, 25, 100, 20 );
  g.drawString( "Current RGB: " + g.getColor(), 130, 40 );
  g.setColor( new Color( 0.0f, 1.0f, 0.0f ) );
  g.fillRect( 25, 50, 100, 20 );
  g.drawString( "Current RGB: " + g.getColor(), 130, 65 );
  g.setColor( Color.blue );
  g.fillRect( 25, 75, 100, 20 );
  g.drawString( "Current RGB: " + g.getColor(), 130, 90 );
  Color c = Color.magenta;
  g.setColor( c );
  g.fillRect( 25, 100, 100, 20 );
  g.drawString( "RGB values: " + c.getRed() + ", " + c.getGreen() + ", " + c.getBlue(), 130, 115 );
 }
 public static void main( String args[] ){
   ShowColors app = new ShowColors();
  app.addWindowListener(
    new WindowAdapter() {
     public void windowClosing( WindowEvent e ){
       System.exit( 0 );
      }
     }
    );
 }
}