MainClass.java Source code

Introduction

Here is the source code for MainClass.java

Source

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

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;

public class MainClass extends JPanel {
    GridBagConstraints constraints = new GridBagConstraints();

    public MainClass() {
        setLayout(new GridBagLayout());
        constraints.weightx = 1.0;
        constraints.weighty = 1.0;
        constraints.fill = GridBagConstraints.BOTH;
        int x, y;
        constraints.gridheight = 2; // span two rows
        addGB(new JButton("one"), x = 0, y = 0);
        constraints.gridheight = 1; // set it back
        addGB(new JButton("two"), x = 1, y = 0);
        addGB(new JButton("three"), x = 2, y = 0);
        constraints.gridwidth = 2; // span two columns
        addGB(new JButton("four"), x = 1, y = 1);
        constraints.gridwidth = 1; // set it back
    }

    void addGB(Component component, int x, int y) {
        constraints.gridx = x;
        constraints.gridy = y;
        add(component, constraints);
    }

    public static void main(String[] args) {
        JFrame frame = new JFrame("MainClass");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setSize(200, 200);
        frame.setLocation(200, 200);
        frame.setContentPane(new MainClass());
        frame.setVisible(true);
    }
}