Thread: On Screen Keyboard help

I am new to Java GUI and I wanted to make an onscreen keyboard.
I just need help regarding the caps lock button and the shift button..

any ideas on to how to implement the caps lock and shift function?

here's the code:

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.util.*;
 
@
SuppressWarnings("serial")
public class MainFrame extends JFrame {
        private JTextField textField;
        private PopUpKeyboard keyboard;
    public MainFrame() {
        super("pop-up keyboard");
        setDefaultCloseOperation(EXIT_ON_CLOSE);
 
        textField = new JTextField(20);
        keyboard = new PopUpKeyboard(textField);
 
        textField.addMouseListener(new MouseAdapter() {@
            Override
            public void mouseClicked(MouseEvent e) {
                Point p = textField.getLocationOnScreen();
                p.y += 30;
                keyboard.setLocation(p);
                keyboard.setVisible(true);
            }
        });
        setLayout(new FlowLayout());
        add(textField);
 
        pack();
        setLocationByPlatform(true);
    }
 
    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {@
            Override
            public void run() {
                new MainFrame().setVisible(true);
            }
        });
    }
 
    private class PopUpKeyboard extends JDialog implements ActionListener {
        private JTextField textField;
 
        public PopUpKeyboard(JTextField textField) {
                this.textField=textField;
            this.setResizable(false);
            this.getContentPane().setPreferredSize(new Dimension(1000, 250));
            this.setLocation(50, 50);
            keyboardVariables();
 
        }
 
        private void keyboardVariables() {
 
                    String firstRow[] = {
                        "~", "1", "2", "3", "4", "5", "6", "7", "8", "9", "0", "-", "+", "Back Space"
                    };
                    String secondRow[] = {
                        "Tab", "Q", "W", "E", "R", "T", "Y", "U", "I", "O", "P", "[", "]", "|"
                    };
                    String thirdRow[] = {
                        "A", "S", "D", "F", "G", "H", "J", "K", "L", ";", "'", "Enter"
                    };
                    String fourthRow[] = {
                        "Shift", "Z", "X", "C", "V", "B", "N", "M", ",", ".", "?"
                    };
                    String fifthRow[] = {
                        "Space"
                    };
 
                    JButton first[];
                    JButton second[];
                    JButton third[];
                    JButton fourth[];
                    JButton fifth[];
 
            setLayout(new BorderLayout());
            Font font;
            float size;
            JPanel jpNorth = new JPanel();
            JPanel jpCenter = new JPanel();
            JPanel jpKeyboard = new JPanel();
            JPanel jpNote = new JPanel();
            add(jpNorth, BorderLayout.NORTH);
            add(jpCenter, BorderLayout.CENTER);
            add(jpKeyboard, BorderLayout.SOUTH);
            jpNorth.setLayout(new BorderLayout());
            jpCenter.setLayout(new BorderLayout());
            jpKeyboard.setLayout(new GridLayout(5, 1));
            pack();
 
            first = new JButton[firstRow.length];
            JPanel p = new JPanel(new GridLayout(1, firstRow.length));
            for (int i = 0; i < firstRow.length; i++) {
                JButton b = new JButton(firstRow[i]);
                b.setPreferredSize(new Dimension(100, 50));
                b.addActionListener(this);
                first[i] = b;
                p.add(first[i]);
            }
            jpKeyboard.add(p);
 
            second = new JButton[secondRow.length];
            p = new JPanel(new GridLayout(1, secondRow.length));
            for (int i = 0; i < secondRow.length; ++i) {
                second[i] = new JButton(secondRow[i]);
                second[i].addActionListener(this);
                p.add(second[i]);
 
            }
            jpKeyboard.add(p);
 
            third = new JButton[thirdRow.length];
            p = new JPanel(new GridLayout(1, thirdRow.length));
            JToggleButton toggleButton = new JToggleButton("CapsLock");
            toggleButton.addActionListener(this);
            p.add(toggleButton);
            for (int i = 0; i < thirdRow.length; ++i) {
                third[i] = new JButton(thirdRow[i]);
                third[i].addActionListener(this);
                p.add(third[i]);
            }
            jpKeyboard.add(p);
 
            fourth = new JButton[fourthRow.length];
            p = new JPanel(new GridLayout(1, fourthRow.length));
            for (int i = 0; i < fourthRow.length; ++i) {
                fourth[i] = new JButton(fourthRow[i]);
                fourth[i].addActionListener(this);
                p.add(fourth[i]);
            }
 
            p.add(new JPanel());
            jpKeyboard.add(p);
            fifth = new JButton[fifthRow.length];
            p = new JPanel(new GridLayout(1, fifthRow.length));
            for (int i = 0; i < fifthRow.length; ++i) {
                JButton b = new JButton(fifthRow[i]);
                                fifth[i] = b;
                fifth[i].addActionListener(this);
                b.setPreferredSize(new Dimension(20, 10));
                p.add(fifth[i]);
            }
            jpKeyboard.add(p);
        }
 
                public void actionPerformed(ActionEvent e) {
                        String action = e.getActionCommand();
                        boolean capslock = false;
                        boolean shift = true;
                        if(action == "Back Space"){
                                textField.setText(textField.getText().substring(0, textField.getText().length()-1));
                        }else if (action == "Tab"){
                                textField.setText(textField.getText() + "\t");
                        }else if (action == "Space"){
                                textField.setText(textField.getText() + " ");
                        }else if (action == "Enter"){
                                textField.setText(textField.getText() + "\n");
                        }else if(action == "Shift"){
                                shift = false; //here
                        }else if(action == "CapsLock"){
                                textField.setText(textField.getText().toUpperCase()); //here
                        }
                        else{
                                textField.setText(textField.getText() + action.toLowerCase());
                        }
                }
    }
}

thanks in advance