Close button does not work when I am using java.awt extends frame

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Java

GUI

I am using java to create a program that displays a quiz as a GUI interface using the code below. However when I run the program I can not close the window using the usual close X button. How do I over come this?

What I have tried:

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

/**
 *
 * @author Joseph
 */
public class PartA extends Frame implements ActionListener, WindowListener
{
    private Button checkButton;//Button displaying "check"
    private Button resetButton;//Button displaying "reset"
    private Panel option1;
    private Panel option2;
    private Panel option3;
    public JCheckBox answer1;//first possible answer
    public JCheckBox answer2;//second possible answer
    public JCheckBox answer3;//third possible answer
    
    private String outputAns;//Displays whether answer is correct
    
    public PartA () {
        setLayout(new FlowLayout());
        
        Label header = new Label("123 Practice Assesment\n Question 1\n");
        add(header);//Declare and add title to interface
        
        Label question = new Label("In Disney's animated movie 'Frozen', what is the name of the snowman that comes to help");
        add(question);//Declare and add question to interface
        
        //Add text to possible answers
        answer1 = new JCheckBox("Olaf");
        answer2 = new JCheckBox("Snowlaf");
        answer3 = new JCheckBox("Yolaf");
        
        //add first answer to interface
        option1 = new Panel();
        option1.add(answer1);
        add(option1);
        
        //add second answer to interface
        option2 = new Panel();
        option2.add(answer2);
        add(option2);
        
        //add third answer to interface
        option3 = new Panel();
        option3.add(answer3);
        add(option3);
        
        //add check button to interface
        checkButton = new Button("Check");
        add(checkButton);
        checkButton.addActionListener(this);
        
        //add reset button to interface
        resetButton = new Button("Reset");
        add(resetButton);
        resetButton.addActionListener(this);
        
        setTitle("X123 Practice Assesment\n Question");//Set title of interface to "X123 Practice Assessment"
        setSize(1650, 1080);//Make interface full screen
        
        setVisible(true);//Open interface on run
    }
    
    
    
    @Override
    public void actionPerformed(ActionEvent evt) {
       if(evt.getSource() == checkButton){
           if((answer1.isSelected()) && (!answer2.isSelected()) && (!answer3.isSelected()))
           {
               outputAns = "That was the correct answer";
           }else
           {
               outputAns = "That was the incorrect answer";
           }
           
           JOptionPane.showMessageDialog(null, outputAns);
       }else
       {
           if(answer1.isSelected())
           {
               answer1.setSelected(false);
           }
           if(answer2.isSelected())
           {
               answer2.setSelected(false);
           }
           if(answer3.isSelected())
           {
               answer3.setSelected(false);
           }
       }
    }
    
    @Override
    public void windowDeactivated(WindowEvent we){
        System.exit(0);
    }

    @Override
    public void windowOpened(WindowEvent e) {
        throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
    }

    @Override
    public void windowClosing(WindowEvent e) {
        System.exit(0);
    }

    @Override
    public void windowClosed(WindowEvent e) {
        System.exit(0);
    }

    @Override
    public void windowIconified(WindowEvent e) {
        throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
    }

    @Override
    public void windowDeiconified(WindowEvent e) {
        throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
    }

    @Override
    public void windowActivated(WindowEvent e) {
        throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
    }
}

/**
 *
 * @author Joseph
 */
public class CWq5 {

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        PartA partA = new PartA();
    }
    
}