example4_4.java

书中的例题

/* 按钮动作事件　*/
import java.applet.*;
import java.awt.*;
import java.awt.event.*;
public class Example4_4 extends Applet implements ActionListener
 {
    Label lb=new Label("请输入密码:");
    TextField txt1=new TextField(25);
    Button bn=new Button("确定");
    TextField txt2=new TextField(25);
    public void init()
	{
	  add(lb);
	  add(txt1);
	  txt1.setEchoChar('*');
	  add(bn);
	  add(txt2);
	  bn.addActionListener(this);
	}
   public void actionPerformed(ActionEvent e)
    {
      if (txt1.getText().equals("abc"))
	      txt2.setText("密码正确!!");
	  else
	      txt2.setText("密码错误!!");
   }
}