guidemo4.java

java程序设计语言源代码

//Example 4 of Chapter 5

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

public  class  GUIDemo4
{
	public  static  void  main(String  args[])
	{
		JFrame f = new JFrame("颜色盘");
		JPanel contentpane = new JPanel();
		contentpane.setLayout( new GridLayout( 4 , 3 ));
		f.setContentPane(contentpane);
		
		JButton bblue = new  JButton("blue");
		JButton bcyan = new  JButton("cyan");
		JButton bgray = new  JButton("gray");
		JButton bgreen = new  JButton("green");
		JButton bmagenta = new  JButton("magenta");
		JButton borange = new  JButton("orange");
		JButton bpink = new  JButton("pink");
		JButton bred = new  JButton("red");
		JButton bwhite = new  JButton("white");
		JButton byellow = new  JButton("yellow");
		JButton bdarkGray = new  JButton("darkGray");
		JButton blightGray = new  JButton("lightGray");
		
		bblue.addActionListener(new ActionHandler(bblue));
		bcyan.addActionListener(new ActionHandler(bcyan));
		bgray.addActionListener(new ActionHandler(bgray));
		bgreen.addActionListener(new ActionHandler(bgreen));
		bmagenta.addActionListener(new ActionHandler(bmagenta));
		borange.addActionListener(new ActionHandler(borange));
		bpink.addActionListener(new ActionHandler(bpink));
		bred.addActionListener(new ActionHandler(bred));
		bwhite.addActionListener(new ActionHandler(bwhite));
		byellow.addActionListener(new ActionHandler(byellow));
		bdarkGray.addActionListener(new ActionHandler(bdarkGray));
		blightGray.addActionListener(new ActionHandler(blightGray));
		
		contentpane.add(bblue);
		contentpane.add(bcyan);
		contentpane.add(bgray);
		contentpane.add(bgreen);
		contentpane.add(bmagenta);
		contentpane.add(borange);
		contentpane.add(bpink);
		contentpane.add(bred);
		contentpane.add(bwhite);
		contentpane.add(byellow);
		contentpane.add(bdarkGray);
		contentpane.add(blightGray);
		
		f.setSize(360 , 160);
		f.setVisible(true);
		f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	}
}

class ActionHandler implements ActionListener
{
	JButton bb;
	public ActionHandler(JButton b)
	{
		bb=b;
	}
	
	public void actionPerformed(ActionEvent e)
	{
		if(e.getActionCommand().equals("blue"))
			bb.setBackground(Color.blue);
		if(e.getActionCommand().equals("cyan"))
			bb.setBackground(Color.cyan);
		if(e.getActionCommand().equals("gray"))
			bb.setBackground(Color.gray);
		if(e.getActionCommand().equals("green"))
			bb.setBackground(Color.green);
		if(e.getActionCommand().equals("magenta"))
			bb.setBackground(Color.magenta);
		if(e.getActionCommand().equals("orange"))
			bb.setBackground(Color.orange);
		if(e.getActionCommand().equals("pink"))
			bb.setBackground(Color.pink);
		if(e.getActionCommand().equals("red"))
			bb.setBackground(Color.red);
		if(e.getActionCommand().equals("white"))
			bb.setBackground(Color.white);
		if(e.getActionCommand().equals("yellow"))
			bb.setBackground(Color.yellow);
		if(e.getActionCommand().equals("darkGray"))
			bb.setBackground(Color.darkGray);
		if(e.getActionCommand().equals("lightGray"))
			bb.setBackground(Color.lightGray);
	}
}