Main.java Source code

Introduction

Here is the source code for Main.java

Source

import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;

import javax.swing.Box;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.WindowConstants;

public class Main {
    static int value = 99;

    public static void main(String[] args) {
        JFrame frame = new JFrame();
        final JLabel valueLabel = new JLabel(String.valueOf(value));
        JButton decButton = new JButton("-");
        decButton.addActionListener(e -> valueLabel.setText(String.valueOf(--value)));

        JButton incButton = new JButton("+");
        incButton.addActionListener(e -> valueLabel.setText(String.valueOf(++value)));

        JPanel panel = new JPanel();
        panel.setLayout(new GridBagLayout());
        GridBagConstraints c = new GridBagConstraints();
        c.weightx = 1;
        c.gridx = 0;
        c.gridy = 0;
        panel.add(decButton, c);
        c.gridx = 1;
        panel.add(valueLabel, c);
        c.gridx = 2;
        panel.add(incButton, c);

        c.gridy = 1;
        int w = 32;
        for (c.gridx = 0; c.gridx < 3; c.gridx++) {
            panel.add(Box.createHorizontalStrut(w), c);
        }

        frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        frame.add(panel);
        frame.pack();
        frame.setVisible(true);
    }
}