shiyan7_4.java

java例子

import java.applet.*;
import java.awt.*;
import java.awt.event.*;
public class Shiyan7_4 extends Applet implements ActionListener
{
	List ls;
	Choice chi;
	Button but;
	public void init()
	{
		ls=new List(10,true);//滚动列表
		ls.add("red");
		ls.add("green");
		ls.add("yellow");
		ls.add("blue");
		add(ls);
		chi=new Choice();//下拉列表
		chi.add("请选择。。");
		add(chi);
		but=new Button("按扭");
		setLayout(new FlowLayout());
		add(but);
		but.addActionListener(this);
	}
	public void actionPerformed(ActionEvent e)
	{
		if(e.getSource()==but)
		{
			chi.add(ls.getSelectedItem());
			repaint();
		}
	}
}