package test;

import javax.swing.*;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

public class SwingTest {

public static void main(String[] args) {

JFrame jframe = new JFrame("A Frame");

JButton jButton = new JButton("A Button");

//原来的写法

jButton.addActionListener(new ActionListener() {

@Override

public void actionPerformed(ActionEvent e) {

System.out.println("Pressed");

}

});

//λ 写法

jButton.addActionListener(e -> System.out.println("Pressed"));

jframe.add(jButton);

jframe.pack();

jframe.setVisible(true);

jframe.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

System.out.println("");

}

}