Question

JAVA 的界面，按钮响应问题

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

public class GUI1 extends JFrame{
private JButton b1=new JButton("button1");
private JButton b2=new JButton("button2");
private JTextField txt=new JTextfield(10);
private ActionListener bl=new ActionListener(){ //定义一个内部类
public void actionPerformed(ActionEvent e){
String name=((JButton)e.getSource()).getText();
txt.setName(name);
}
};
public GUI1(){
b1.addActionListener(bl);
b2.addActionListener(bl);
setLayout(new FlowLayout);
add(b1);
add(b2);
add(txt);
}
public static void main(String[] args) {
GUI1 s=new GUI1();
}
}

Answer 1

亲，你的代码问题大大的。。
下面是给你改的。

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

public class GUI1 extends JFrame{
JTextField txt;
public GUI1(){
JButton b1=new JButton("button1");
JButton b2=new JButton("button2");
txt=new JTextField(10);
ActionListener bl=new ActionListener(){ //定义一个内部类
public void actionPerformed(ActionEvent e){
String name=((JButton)e.getSource()).getText();
txt.setText(name);
};
};
b1.addActionListener(bl);
b2.addActionListener(bl);
this.add(b1);
this.add(b2);
this.add(txt);
}
public static void main(String[] args) {
GUI1 s=new GUI1();
s.setLayout(new FlowLayout());
s.setVisible(true);
s.setBounds(500, 200, 200, 400);
s.setDefaultCloseOperation(DISPOSE_ON_CLOSE);
}
}

Answer 2

txt.setName(name);
=>

txt.setText(name);

追问

还是不对

追答

有什么问题？

add(txt); 后加上
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
pack();
setVisible(true);

追问

追答

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

public class GUI1 extends JFrame{
private JButton b1=new JButton("button1");
private JButton b2=new JButton("button2");
private JTextField txt=new JTextField(10);
private ActionListener bl=new ActionListener(){
public void actionPerformed(ActionEvent e){
String name=((JButton)e.getSource()).getText();
txt.setText(name);
}
};
public GUI1(){
b1.addActionListener(bl);
b2.addActionListener(bl);
setLayout(new FlowLayout());
add(b1);
add(b2);
add(txt);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
pack();
setVisible(true);
}
public static void main(String[] args) {
GUI1 s=new GUI1();
}
}

Answer 3

setLayout(new FlowLayout); 这个new FlowLayout没有括号，另外没有setVisible显示出来