java程序

 package Dome3;

 import java.awt.Button;
 import java.awt.FlowLayout;
 import java.awt.Frame;
 import java.awt.TextArea;
 import java.awt.TextField;
 import java.awt.event.ActionEvent;
 import java.awt.event.ActionListener;
 import java.awt.event.WindowAdapter;
 import java.awt.event.WindowEvent;

 public class Dome3 {
     public static void main(String[] args) {
         Frame f = new Frame("Dome3");
         f.setBounds(500, 300, 300, 250);

         // 关闭按钮
         f.addWindowListener(new WindowAdapter() {
             public void windowClosing(WindowEvent e) {
                 System.exit(0);
             }
         });

         // 设置布局
         f.setLayout(new FlowLayout());

         // 添加控件

         // 创建文本框
         final TextField tf = new TextField(20);
         // 创建文本域
         final TextArea taArea = new TextArea(8, 30);
         // 创建按钮
         Button bt = new Button("确定");

         // 为button创建点击事件
         bt.addActionListener(new ActionListener() {
             public void actionPerformed(ActionEvent arg0) {
                 taArea.append(tf.getText() + "\r\n");
                 tf.requestFocus();
             }
         });

         // 添加控件
         f.add(tf);
         f.add(bt);
         f.add(taArea);
         // 显示窗体
         f.setVisible(true);

     }
 }