【程式設計】按鈕式改背景顏色－萬花筒

java FlowerTest

檔案名:Flower.java

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

public class Flower extends JFrame
{

   private Color color[] = {Color.RED, Color.ORANGE, Color.YELLOW, Color.GREEN};
   private JRadioButton Color1;
   private JRadioButton Color2;
   private JRadioButton Color3;
   private JRadioButton Color4;
   private ButtonGroup radioGroup;

   public Flower()

{

      super("Wulala");
      setLayout(new FlowLayout());

    Color1 = new JRadioButton("紅色",true);
    Color2 = new JRadioButton("橙色",false);
    Color3 = new JRadioButton("黃色",false);
    Color4 = new JRadioButton("綠色",false);

    add(Color1);
    add(Color2);
    add(Color3);
    add(Color4);

    radioGroup = new ButtonGroup();
    radioGroup.add(Color1);
    radioGroup.add(Color2);
    radioGroup.add(Color3);
    radioGroup.add(Color4);

    Color1.addItemListener(new F(color[0]));
    Color2.addItemListener(new F(color[1]));
    Color3.addItemListener(new F(color[2]));
    Color4.addItemListener(new F(color[3]));

   }

   private class F implements ItemListener

{

      private Color color;

      public F(Color c)

{

color = c;

      }

      public void itemStateChanged(ItemEvent event)

{

         getContentPane().setBackground(color);

         }

}

}

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檔案名:FlowerTest.java

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

public class FlowerTest

{

public static void main( String args[] )

{

      Flower F = new Flower();

      F.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
      F.setSize( 300, 100 );
      F.setVisible( true );
      F.getContentPane().setBackground(Color.RED);

}