text_listener.java

200多个自己编的java程序,大家可以学一下.

/*
 * Text_Listener.java
 *
 * Created on 2004年9月20日, 下午12:52
 */

/**
 *
 * @author  litertiger
 */
import java.applet.*;
import java.awt.*;
import java.awt.event.*;
public class Text_Listener extends java.applet.Applet implements ActionListener{
    TextField text1;
    TextField text2;
    TextField text3;
    /** Initialization method that will be called after the applet is loaded
     *  into the browser.
     */
    public void init() {
        text1=new TextField(10);
        text2=new TextField(10);
        text3=new TextField(10);
        add(text1);
        Label l1=new Label("平方值为：");
        add(l1);
        add(text2);
        Label l2=new Label("立方值为：");
        add(l2);
        add(text3);
        text1.addActionListener(this);
        // TODO start asynchronous download of heavy resources
    }
    
    public void actionPerformed(ActionEvent e) {
        long n2,n3;
        if(e.getSource()==text1)
        {
            long n;
            n=Long.parseLong(text1.getText());
            n2=n*n;
            n3=n*n*n;
            text2.setText(String.valueOf(n2));
            text3.setText(String.valueOf(n3));
            //将一个数字转化为字符串用Sting.valueOf(Long)
            
        }
        else
        {
            
        }
    }
    
    // TODO overwrite start(), stop() and destroy() methods
}