ComboLock.java

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

@SuppressWarnings({ "rawtypes", "unchecked", "serial" })
public class ComboLock extends JPanel{

    @SuppressWarnings("unused")
public ComboLock() {
    JPanel combo = new JPanel();
    JLabel prompt = new JLabel("Please enter the combonation:");
    combo.add(prompt);
    prompt.setAlignmentY(Component.TOP_ALIGNMENT);
    prompt.setAlignmentX(Component.CENTER_ALIGNMENT);



    JOptionPane JOptionPane = new JOptionPane();
    int ccomp = 0;
    int icombo1 = 1;
    int icombo2 = 2;
    int icombo3 = 3;
    int ATS = 3;

    String[] lcombo = { "0", "1", "2", "3", "4", "5", "6", "7", "8", "9" };


    JComboBox c1 = new JComboBox(lcombo);
    combo.add(c1);
    c1.setAlignmentY(Component.CENTER_ALIGNMENT);
    c1.setAlignmentX(Component.LEFT_ALIGNMENT);


    JComboBox c2 = new JComboBox(lcombo);
    combo.add(c2);
    c2.setAlignmentY(Component.CENTER_ALIGNMENT);
    c2.setAlignmentX(Component.CENTER_ALIGNMENT);


    JComboBox c3 = new JComboBox(lcombo);
    combo.add(c3);
    c3.setAlignmentY(Component.CENTER_ALIGNMENT);
    c3.setAlignmentX(Component.RIGHT_ALIGNMENT);

    JButton check = new JButton("Check");
    combo.add(check);
    check.setAlignmentY(Component.BOTTOM_ALIGNMENT);
    check.setAlignmentX(Component.CENTER_ALIGNMENT);
    check.addActionListener(this);

    @Override
    public void actionPerformed(ActionEvent e) {

        int c1i = c1.getSelectedIndex();

        int c2i = c2.getSelectedIndex();

        int c3i = c3.getSelectedIndex();





        if (c1i == icombo1) {
            ccomp = ccomp  + 1;
        } else {
            ccomp = ccomp  - 1;
        }
        if (c2i == icombo1) {
            ccomp = ccomp + 1;
        } else {
            ccomp = ccomp  - 1;
        }
        if (c3i == icombo1) {
            ccomp = ccomp  + 1;
        } else {
            ccomp = ccomp  - 1;
        }

        if (ccomp == 3) {
            JOptionPane.setMessage("Combo Lock Unlocked");
            JOptionPane.setName("Info");
            JOptionPane.setMessageType(1);
            ATS = 3;
        } else {
            JOptionPane.setMessage("Combo Lock Not Correct, " + ATS + "attempts remaining!");
            JOptionPane.setName("Error");
            JOptionPane.setMessageType(3);
            c1.setSelectedIndex(0);
            c2.setSelectedIndex(0);
            c3.setSelectedIndex(0);
            ATS = ATS - 1;
    }
    }
    }

private static void createAndShowGUI() {


        JFrame frame = new JFrame("Combo Lock");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);


        ComboLock newContentPane = new ComboLock();
        newContentPane.setOpaque(true);
        frame.setContentPane(newContentPane);


        frame.pack();
        frame.setSize(450, 260);

        frame.setVisible(true);

}


    public static void main(String[] args) {
        javax.swing.SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                createAndShowGUI();
            }
        });
    }


        }