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import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class FrameDemo extends JFrame
implements ActionListener {
public FrameDemo() {
setTitle("FrameDemo");
JButton btn = new JButton("退出");
add(btn);
btn.addActionListener(this);
}
public void actionPerformed(ActionEvent e) {
System.exit(0);
}
public static void main(String[] args) {
FrameDemo f = new FrameDemo();
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.pack();
f.setVisible(true);
}
}
package com.tarena;
public class Hello{
public static void main(String[] args){
System.out.println("Hello World");
}
}