Stuck at changing size of the panels

Question

I'm new to Java. So I copied source code on the internet and changed it to what I wanted.

I'm developing a point of sales system in java and already done with a cash register system.

I wanted to make a table arrangement thing like if someone clicks a Table1 button, they can go to the cash register page and continue to order, payment stuffs. I didn't develop event part yet because I'm stuck at changing the size of the panels :(

I was trying to use setPreferredSize but failed.

This is the code I've been working on and I'll attach a screenshot what I want to make.

package table;

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


public class tablearray extends JApplet {

    private JPanel parentPanel, titlePanel, tablePanel, tablefor4Panel, barPanel;
    private JPanel table4andbarPanel, tablefor2Panel, bottomPanel;
    private JLabel lblTitle;
    private JButton btntable1, btntable2, btntable3, btntable4, btntable5, btntable6;
    private JButton btntable7, btntable8, btntable9;
    private JButton btnbar1, btnbar2, btnbar3, btnbar4;
    private ButtonGroup grpTablefor4, grpTablefor2, grpBar;

    /**
     * Constants
     */

    // Applet Size
    private final Dimension appletSize = new Dimension(800, 600);


    // Bottom buttons size
    //private final Dimension BUTTON_SIZE = new Dimension(50,50);            

    // flag, if the user does not enter a number in the dialog
    private final int DIALOG_NOT_NUM = -1;                            

    // flag, if the user cancels the dialog
    private final int DIALOG_CANCEL = -2;                            


     public void init()
        {
            // set applet size
            this.setSize(appletSize);

            /**
            * Create Panels
            */
            parentPanel = new JPanel();
            titlePanel = new JPanel();
            tablePanel = new JPanel();
            tablefor4Panel = new JPanel();
            barPanel = new JPanel();
            table4andbarPanel = new JPanel();
            tablefor2Panel = new JPanel();
            bottomPanel = new JPanel();


            /**
            * Set Panel Layouts
            */

            parentPanel.setLayout(new BorderLayout());
            titlePanel.setLayout(new BoxLayout(titlePanel, BoxLayout.Y_AXIS));
            tablePanel.setLayout(new GridLayout(1,2,50,50));
            table4andbarPanel.setLayout(new BorderLayout());
            tablefor4Panel.setLayout(new GridLayout(2,3,100,100));
            barPanel.setLayout(new GridLayout(1,4,30,30));
            tablefor2Panel.setLayout(new GridLayout(4,1,100,100));
            bottomPanel.setLayout(new BorderLayout(5,5));


            /**
            * Set Panel Borders
            */
            // Tablefor2's Border
            TitledBorder billBorder = new TitledBorder(BorderFactory.createEtchedBorder(),
                    "Tablefor2", TitledBorder.CENTER, TitledBorder.CENTER);
            tablefor2Panel.setBorder(billBorder);

            // Table's Border
            TitledBorder orderBorder = new TitledBorder(BorderFactory.createEtchedBorder(),
                    "Table management", TitledBorder.LEFT, TitledBorder.CENTER);
            tablePanel.setBorder(orderBorder);

            // Tablefor4's Border
            TitledBorder mainBorder = new TitledBorder(BorderFactory.createEtchedBorder(),
                    "Tablefor4", TitledBorder.LEFT, TitledBorder.CENTER);
            tablefor4Panel.setBorder(mainBorder);

            // Bar's Border
            TitledBorder drinkBorder = new TitledBorder(BorderFactory.createEtchedBorder(),
                    "Bar", TitledBorder.LEFT, TitledBorder.CENTER);
            barPanel.setBorder(drinkBorder);

            /**
            * Create Components
            */
            // Title
            lblTitle = new JLabel("- Tasting Room -");
            lblTitle.setFont (new Font ("Book Antiqua", Font.BOLD, 18));
            lblTitle.setAlignmentX(Component.CENTER_ALIGNMENT);
            titlePanel.add(lblTitle);

            //Tablefor4
            grpTablefor4 = new ButtonGroup();
            btntable1 = new JButton("T1");
            btntable2 = new JButton("T2");
            btntable3 = new JButton("T3");
            btntable4 = new JButton("T4");
            btntable5 = new JButton("T5");
            btntable6 = new JButton("T6");
            btntable1.setPreferredSize(new Dimension(100,100));


            grpTablefor4.add(btntable1);
            grpTablefor4.add(btntable2);
            grpTablefor4.add(btntable3);
            grpTablefor4.add(btntable4);
            grpTablefor4.add(btntable5);
            tablefor4Panel.add(btntable1);
            tablefor4Panel.add(btntable2);
            tablefor4Panel.add(btntable3);
            tablefor4Panel.add(btntable4);
            tablefor4Panel.add(btntable5);
            tablefor4Panel.add(btntable6);



            //tablefor2
            grpTablefor2 = new ButtonGroup();
            btntable7 = new JButton("T7");
            btntable8 = new JButton("T8");
            btntable9 = new JButton("T9");
            btntable7.setPreferredSize(new Dimension(30,30));


            grpTablefor2.add(btntable7);
            grpTablefor2.add(btntable8);
            grpTablefor2.add(btntable9);
            tablefor2Panel.add(btntable7);
            tablefor2Panel.add(btntable8);
            tablefor2Panel.add(btntable9);

            // bar
            grpBar = new ButtonGroup();
            btnbar1 = new JButton("B1");
            btnbar2 = new JButton("B2");
            btnbar3 = new JButton("B3");
            btnbar4 = new JButton("B4");


            grpBar.add(btnbar1);
            grpBar.add(btnbar2);
            grpBar.add(btnbar3);
            grpBar.add(btnbar4);

            barPanel.add(btnbar1);
            barPanel.add(btnbar2);
            barPanel.add(btnbar3);
            barPanel.add(btnbar4);


             /** Add Panels
             */
            table4andbarPanel.add(tablefor4Panel, BorderLayout.NORTH);
            table4andbarPanel.add(barPanel,BorderLayout.CENTER);
            tablePanel.add(table4andbarPanel, 0);
            tablePanel.add(tablefor2Panel, 1);
            parentPanel.add(titlePanel, BorderLayout.NORTH);
            parentPanel.add(tablePanel, BorderLayout.CENTER);
            parentPanel.add(bottomPanel, BorderLayout.SOUTH);
            add(parentPanel);
        }



}

Answer 1

This is the closest layout that I could come up with MigLayout:

package com.zetcode;

import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JButton;
import javax.swing.SwingUtilities;

import net.miginfocom.swing.MigLayout;

/*
Demonstrating layout in MigLayout manager.
Author: Jan Bodnar
Website: zetcode.com
 */
public class MigLayoutBoxesEx extends JFrame {

    public MigLayoutBoxesEx() {

        initUI();
    }

    private void initUI() {

        JButton btn1 = new JButton("1");
        JButton btn2 = new JButton("2");
        JButton btn3 = new JButton("3");
        JButton btn4 = new JButton("4");
        JButton btn5 = new JButton("5");
        JButton btn6 = new JButton("6");

        JButton btn7 = new JButton("7");
        JButton btn8 = new JButton("8");
        JButton btn9 = new JButton("9");

        JButton btn10 = new JButton("10");
        JButton btn11 = new JButton("11");
        JButton btn12 = new JButton("12");
        JButton btn13 = new JButton("13");

        createLayout(btn1, btn2, btn3, btn4, btn5,
                btn6, btn7, btn8, btn9, btn10, btn11, btn12, btn13);

        setTitle("MigLayout example");
        setLocationRelativeTo(null);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    }

    private void createLayout(JComponent... arg) {

        setLayout(new MigLayout("gap 10lp 15lp, ins 15lp"));

        add(arg[0], "w 90lp, h 90lp");
        add(arg[1], "w 90lp, h 90lp");
        add(arg[2], "w 90lp, h 90lp");
        add(arg[6], "w 50lp, h 50lp, growy, split 3, flowy, spany 2");
        add(arg[7], "w 50lp, h 50lp, growy");
        add(arg[8], "w 50lp, h 50lp, growy, wrap");

        add(arg[3], "w 90lp, h 90lp");
        add(arg[4], "w 90lp, h 90lp");
        add(arg[5], "w 90lp, h 90lp, wrap");

        add(arg[9], "w 50lp, h 20lp, growx, split 4, span 3");
        add(arg[10], "w 50lp, h 20lp, growx");
        add(arg[11], "w 50lp, h 20lp, growx");
        add(arg[12], "w 50lp, h 20lp, growx");

        pack();
    }

    public static void main(String[] args) {

        SwingUtilities.invokeLater(() -> {
            MigLayoutBoxesEx ex = new MigLayoutBoxesEx();
            ex.setVisible(true);
        });
    }
}

Screenshot:

Answer 2

There are a few different ways to keep your Swing components from resizing. One way is to make use of absolute positioning. This basically involves removing any layout management (GridLayout, FlowLayout, BorderLayout, etc.). If you want to keep your layout manager but also disable component resizing, you need to force your component to a static size. Keep in mind that both of these solutions will disable any component resizing when resizing the parent window.

public class TableButton extends JButton {

    private Dimension staticSize;

    public TableButton(String text, Dimension size) {
        super(text);
        staticSize = size;
    }

    @Override
    public Dimension getSize() {
        return staticSize;
    }

    @Override
    public Dimension getMinimumSize() {
        return staticSize;
    }

    @Override 
    public Dimension getMaximumSize() {
        return staticSize;
    }

    @Override 
    public Dimension getPreferredSize() {
        return staticSize;
    }

    @Override
    public int getWidth() {
        return staticSize.width;
    }

    @Override
    public int getHeight() {
        return staticSize.height;
    }
}

Dimension largeTableSize = new Dimension(80,80);
btntable1 = new TableButton("T1", largeTableSize);
btntable2 = new TableButton("T2", largeTableSize);
btntable3 = new TableButton("T3", largeTableSize);
btntable4 = new TableButton("T4", largeTableSize);
btntable5 = new TableButton("T5", largeTableSize);
btntable6 = new TableButton("T6", largeTableSize);