Question

一个Java小应用程序，界面有三个文本框和两个按钮，前两个文本框用于输入整数，第三个文本框用于输出结果

import java.applet.*;import javax.swing.*;
import java.awt.*; import java.awt.event.*;
class Panel1 extends JPanel{
JTextField text1, text2, text3;
JButton addButton,subButton;
Panel1(){
text1=new JTextField(10);
text2=new JTextField(10);
text3=new JTextField(10);
setLayout(new GridLayout(5,1));
addButton=new JButton(＂加＂)；
subButton=new JButton(＂减＂)；
add(text1);
add(text2);
add(text3);
add(addButton);
add(subButton);
}
}
public class Classl extends Applet implementsActionListener{
Pane1 panel;
public void init(){
setSize(100,200); panel=new Panel1();add(panel);
(panel.addButton).addActionListener(this);
(panel.subButton). addActionListener(this);
}
public void actionPerformed(ActionEvent e){
//这里是你要编写的代码

Answer 1

	@Override
	public void actionPerformed(ActionEvent e) {
		if (e.getSource() == panel.addButton){
			int t1 = Integer.parseInt(panel.text1.getText());
			int t2 = Integer.parseInt(panel.text2.getText());
			panel.text3.setText(t1 + t2 + "");
		}
		if (e.getSource() == panel.subButton){
			int t1 = Integer.parseInt(panel.text1.getText());
			int t2 = Integer.parseInt(panel.text2.getText());
			panel.text3.setText(t1 - t2 + "");
		}
	}

Answer 2

很成功收到一条