https 2f 2fintrocs cs princeton edu 2fjava 2f15inout 2fgui java html

1/******************************************************************************
2 *  Compilation:  javac GUI.java
3 *  Execution:    java GUI
4 *
5 *  A minimal Java program with a graphical user interface. The
6 *  GUI prints out the number of times the user clicks a button.
7 *
8 *  % java GUI
9 *
10 ******************************************************************************/
11
12import javax.swing.*;
13import java.awt.*;
14import java.awt.event.*;
15
16public class GUI implements ActionListener {
17    private int clicks = 0;
18    private JLabel label = new JLabel("Number of clicks:  0     ");
19    private JFrame frame = new JFrame();
20
21    public GUI() {
22
23        // the clickable button
24        JButton button = new JButton("Click Me");
25        button.addActionListener(this);
26
27        // the panel with the button and text
28        JPanel panel = new JPanel();
29        panel.setBorder(BorderFactory.createEmptyBorder(30, 30, 10, 30));
30        panel.setLayout(new GridLayout(0, 1));
31        panel.add(button);
32        panel.add(label);
33
34        // set up the frame and display it
35        frame.add(panel, BorderLayout.CENTER);
36        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
37        frame.setTitle("GUI");
38        frame.pack();
39        frame.setVisible(true);
40    }
41
42    // process the button clicks
43    public void actionPerformed(ActionEvent e) {
44        clicks++;
45        label.setText("Number of clicks:  " + clicks);
46    }
47
48    // create one Frame
49    public static void main(String[] args) {
50        new GUI();
51    }
52}
53
54