12f Mixing Layout Managers in Java

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12 Layout Manager
     a Absolute Positioning
     b Flow Layout
     c Border Layout
     d Grid Layout
     e Grid Bag Layout
     f Mixing Layout Managers

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Mixing Layout Managers

In this example, we mixed together several layouts to achieve our user interface. Its most outer layout is a BorderLayout used by the outermost panel called panOuter. The buttons dog, cat, and pig were placed in 3 of its 5 regions, North, South, and West.

For its East region, a panel called panEast was instantiated. This panel uses a GridLayout of 5 rows and 1 column. PanEast was placed inside the East region of the BorderLayout of panOuter. Inside of panEast was placed the radio buttons for a list of car models.

Of the 5 regions of the BorderLayout, we have left the center. For this region, the panel panCenter was instantiated and given a GridLayout with 3 rows and 2 columns. It was loaded with the buttons lion, tiger, bear, deer, horse, and cow. Then it was place in the Center region of panOuter.

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class MixLay extends JFrame {
    JButton dog = new JButton("Dog");
    JButton cat = new JButton("Cat");
    JButton bird = new JButton("Bird");
    JButton pig = new JButton("Pig");
 
    JButton lion = new JButton("Lion");
    JButton tiger = new JButton("Tiger");
    JButton bear = new JButton("Bear");
    JButton deer = new JButton("Deer");
    JButton horse = new JButton("Horse");
    JButton cow = new JButton("Cow");
    JRadioButton[] cars = new JRadioButton[5];

    public MixLay() {
        super("Animal/Car Mixed Layout");
        setSize(350, 350);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        JPanel panOuter = new JPanel();
        BorderLayout bLay = new BorderLayout();
        panOuter.setLayout(bLay);
        panOuter.add("North", dog);
        panOuter.add("South", cat);
        panOuter.add("West", pig);

        JPanel panEast = new JPanel();
        GridLayout gLay1 = new GridLayout(5, 1);
        panEast.setLayout(gLay1);
	cars[0] = new JRadioButton("Honda");
	cars[1] = new JRadioButton("Mustang");
	cars[2] = new JRadioButton("Crossfire");
	cars[3] = new JRadioButton("BMW");
	cars[4] = new JRadioButton("Mercedes");
	ButtonGroup bGroup = new ButtonGroup();
	for (int i=0; i<5; i++) {
	    bGroup.add(cars[i]);
	    panEast.add(cars[i]);
	}
	panOuter.add("East", panEast);

        JPanel panCenter = new JPanel();
        GridLayout gLay2 = new GridLayout(3, 2);
        panCenter.setLayout(gLay2);
        panCenter.add(lion);
        panCenter.add(tiger);
        panCenter.add(bear);
        panCenter.add(deer);
        panCenter.add(horse);
        panCenter.add(cow);

        panOuter.add("Center", panCenter);
        add(panOuter);
        setVisible(true);
    }

    public static void main(String[] arguments) {
        MixLay frame = new MixLay();
    }
}

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