ActionListener event monitor

package testDemo1;

import java.awt.Button;
import java.awt.FlowLayout;
import java.awt.Frame;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

public class FrameTest {

	public static void main(String[] args) {
		Frame f = new Frame("My first window");// This window is not displayed by default
		f.setSize(400, 600);// Set the window size
		f.setLocation(500, 50);// Set the window display location
		f.setVisible(true);// Display the window

		Button but = new Button("my button");// If the button is set to Chinese, garbled characters may appear
		f.setLayout(new FlowLayout());// The default is a border layout (the button is huge), so you need to set the layout in the main panel
		f.add(but);//Add button to panel

		but.addActionListener(new ActionListener() {

			@Override
			public void actionPerformed(ActionEvent e) {//There is only such an overridable method
				System.out.println("Button triggered" + e);

			}

		});

	}

}

The console shows the result: the button is triggered java.awt.event.ActionEvent[ACTION_PERFORMED,cmd=my button,when=1518246610292,modifiers=] on button0