listswitch.java

一个java的源文件

import java.awt.*;
import java.awt.event.*;
public class ListSwitch
{
	Frame f=new Frame("鼠标双击交换两个List的列表项");
	Panel p1=new Panel();
	Panel p2=new Panel(new GridLayout(2,1,5,30));
	Panel p3=new Panel();
	Button b1=new Button(">>");
	Button b2=new Button("<<");
	List l1=new List(10);
	List l2=new List(10);
	Font ft=new Font("Serif",Font.BOLD,18);
	public static void main(String arg[])
	{
		ListSwitch ls=new ListSwitch();
		ls.go();
	}
	void go()
	{
		f.setSize(500,300);
		f.setLayout(new FlowLayout());
		f.add(p1);
		f.add(p2);
		f.add(p3);
		l1.add("desk");
		l1.add("computer");
		l1.add("printer");
		l1.add("pen");
		l1.add("book");
		l1.add("paper");
		l1.setFont(ft);
		l2.add("yellow");
		l2.add("brown");
		l2.add("white");
		l2.add("pink");
		l2.add("red");
		l2.add("blue");
		l2.setFont(ft);
		p1.add(l1);
		p1.add(b1);
		p2.add(b2);
		b1.setFont(ft);
		b2.setFont(ft);
		p3.add(l2);
		b1.addActionListener(new ButtonHandler(l1,l2));
		b2.addActionListener(new ButtonHandler(l2,l1));
		l1.addMouseListener(new MouseHandler(l1,l2));
		l2.addMouseListener(new MouseHandler(l1,l2));
		f.addWindowListener(new WindowHandler());
		f.setVisible(true);
	}
	void exchange(List la,List lb)
	{
		String itm;
		int idx;
		itm=la.getSelectedItem();
		idx=la.getSelectedIndex();
		if(idx>=0)
		{
			lb.add(itm);
			la.remove(idx);
		}
	}
	class ButtonHandler implements ActionListener
	{
		List laa,lbb;
		ButtonHandler(List la,List lb)
		{
			laa=la;
			lbb=lb;
		}
		public void actionPerformed(ActionEvent e)
		{
			exchange(laa,lbb);
		}
	}
	class MouseHandler extends MouseAdapter
	{
		List laa,lbb;
		MouseHandler(List la,List lb)
		{
			laa=la;
			lbb=lb;
		}
		public void mouseClicked(MouseEvent e)
		{
			if(e.getClickCount()==2)
			exchange(laa,lbb);
		}
	}
	class 	WindowHandler extends WindowAdapter
	{
		public void windowClosing(WindowEvent e)
		{
			System.exit(-1);
		}
	}
}