Lab05 WidgetViewer Help

package lab05;

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

public class ChooseYourOperation {

    public static void main(String[] args) {

        WidgetViewer wv = new WidgetViewer();

        Random rand = new Random();

        int x = rand.nextInt(10); // Generate first random number 0-9 inclusive
        int y = rand.nextInt(10); // Generate second random number 0-9 inclusive

        String text = "x: " + x + " y: " + y; // Ask user what the answer is
        wv.add(new JLabel(text)); // Create text GUI

        String instruction = "Enter an operation number"; // Ask user what the answer is
        wv.add(new JLabel(instruction)); // Create text GUI

        JTextField textField = new JTextField(10); // Store users answer
        wv.add(textField);

        JButton button = new JButton("Press here when you've entered your operation"); // Button for user to hit once entered answer
        wv.addAndWait(button);

        button.addActionListener(new ActionListener() {

            @Override
            public void actionPerformed(ActionEvent arg0) {

                int operationNumber = Integer.parseInt(textField.getText()); // Evaluates stored value

                String result = "";

                if (operationNumber >= 1 && operationNumber <= 10) {
                    result = String.valueOf(x+y);

                }

                else if (operationNumber % 4 == 0) {
                    result = String.valueOf(x-y);

                }

                else if (operationNumber % 5 == 0) {
                    result = String.valueOf(x/y);
                }

                else if (operationNumber % 2 == 0) {
                    result = String.valueOf((float)x/y);
                }

                else {
                    result = String.valueOf(x*y);
                }
 // Ask user what the answer is
                wv.add(new JLabel(result)); // Create text GUI
            }
        });

    }

}