GridBagLayoutTest

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;

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


public class GridBagLayoutTest {
    public static void main(String[] args) {
        MyGridBagLayoutTest test = new MyGridBagLayoutTest();
        test.build();
    }
}

class MyGridBagLayoutTest extends JFrame{
    JPanel pnlCenter = new JPanel();
    JPanel pnlCenterTopLeft = new JPanel();
    JPanel pnlCenterTopRight = new JPanel();
    JPanel pnlCenterBottomLeft = new JPanel();
    JPanel pnlCenterBottomRight = new JPanel();
    JPanel pnl1 = new JPanel();
    JPanel pnl2 = new JPanel();
    JPanel pnl3 = new JPanel();
    JPanel pnl4 = new JPanel();
    JPanel pnl5 = new JPanel();
    JPanel pnl6 = new JPanel();
    JPanel pnl7 = new JPanel();
    JPanel pnl8 = new JPanel();

    void build(){
        this.setLayout(new BorderLayout());

        pnl1.setBackground(Color.GREEN);
        pnl2.setBackground(Color.BLUE);
        pnl3.setBackground(Color.BLACK);
        pnl4.setBackground(Color.YELLOW);
        pnl5.setBackground(Color.RED);
        pnl6.setBackground(Color.ORANGE);
        pnl7.setBackground(Color.LIGHT_GRAY);
        pnl8.setBackground(Color.PINK);

        pnlCenterTopLeft.setLayout(new GridBagLayout());
        pnlCenterTopLeft.add(pnl1, new GridBagConstraints(0,0,1,1,1.0,1.0, GridBagConstraints.NORTHWEST, GridBagConstraints.NONE, new Insets(5,5,0,0),0,0 ));
        pnlCenterTopLeft.add(pnl2, new GridBagConstraints(1,0,1,1,1.0,1.0, GridBagConstraints.NORTHEAST, GridBagConstraints.NONE, new Insets(5,5,0,0),0,0 ));
        pnlCenterTopLeft.add(pnl3, new GridBagConstraints(0,1,GridBagConstraints.REMAINDER,1,1.0,1.0, GridBagConstraints.NORTHWEST, GridBagConstraints.HORIZONTAL, new Insets(5,5,0,0),0,0 ));

        pnlCenterTopRight.setLayout(new GridBagLayout());
        pnlCenterTopRight.add(pnl4, new GridBagConstraints(0,0,1,1,1.0,1.0, GridBagConstraints.NORTHWEST, GridBagConstraints.BOTH, new Insets(5,5,0,0),0,0 ));

        pnlCenterBottomLeft.setLayout(new GridBagLayout());
        pnlCenterBottomLeft.add(pnl5, new GridBagConstraints(0, 0, 1, 1, 1.0, 1.0, GridBagConstraints.NORTHWEST, GridBagConstraints.BOTH, new Insets(5,5,0,0), 0, 0));
        pnlCenterBottomLeft.add(pnl6, new GridBagConstraints(1, 0, 1, 1, 1.0, 1.0, GridBagConstraints.NORTHWEST, GridBagConstraints.BOTH, new Insets(5,5,0,0), 0, 0));
        pnlCenterBottomLeft.add(pnl7, new GridBagConstraints(2, 0, 1, 1, 1.0, 1.0, GridBagConstraints.NORTHWEST, GridBagConstraints.BOTH, new Insets(5,5,0,0), 0, 0));

        pnlCenterBottomRight.setLayout(new GridBagLayout());
        pnlCenterBottomRight.add(pnl8, new GridBagConstraints(0,0,1,1,1.0,1.0, GridBagConstraints.NORTHWEST, GridBagConstraints.BOTH, new Insets(5,5,0,0),0,0 ));

        pnlCenter.setLayout(new GridBagLayout());
        pnlCenter.add(pnlCenterTopLeft, new GridBagConstraints(0,0,1,1,0.5,0.7, GridBagConstraints.NORTHWEST, GridBagConstraints.BOTH, new Insets(5, 5, 0, 0),0,0));
        pnlCenter.add(pnlCenterTopRight, new GridBagConstraints(1,0,1,1,0.5,0.7, GridBagConstraints.NORTHWEST, GridBagConstraints.BOTH, new Insets(5, 5, 0, 0),0,0));
        pnlCenter.add(pnlCenterBottomLeft, new GridBagConstraints(0,1,1,1,0.5,0.3, GridBagConstraints.NORTHWEST, GridBagConstraints.BOTH, new Insets(5, 5, 0, 0),0,0));
        pnlCenter.add(pnlCenterBottomRight, new GridBagConstraints(1,1,1,1,0.5,0.3, GridBagConstraints.NORTHWEST, GridBagConstraints.BOTH, new Insets(5, 5, 0, 0),0,0));

        this.setSize(400, 400);
        this.getContentPane().add(pnlCenter);
        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        this.setVisible(true);

    }
}