Up/Down Write a WidgetView GUI that has the following widgets: a button labeled

Question

Up/Down

Write a WidgetView GUI that has the following widgets:

a button labeled "go up/down"

a label initialized to 0 (we'll call this the left label)

a label initialized to 0 (we'll call this the right label)

a button labeled "go down/up"

When the "go up/down" button is pushed, a random number between 1 and 10 (inclusive) is generated and added to the left label, and another random number between 1 and 10 (inclusive) is generated and subtracted from the right label.

When the "go down/up" button is pushed, a random number between 1 and 10 (inclusive) is generated and subtracted from the left label, and another random number between 1 and 10 (inclusive) is generated and added to the right label.

Explanation / Answer

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.util.Random;
public class UpDown{
    private static JFrame mainFrame;
    private static JLabel leftLabel;
    private static JLabel rightLabel;
    private static JButton downupButton;
    private static JButton updownButton;
    private static JPanel controlPanel;
    static int leftval=0;
    static int rightval=0;
    public static void main(String[] args) {
        mainFrame = new JFrame("Up/Down");
        mainFrame.setSize(400, 400);
        mainFrame.setLayout(new GridLayout(3, 1));
        mainFrame.addWindowListener(new WindowAdapter() {
            public void windowClosing(WindowEvent windowEvent){
                System.exit(0);
            }
        });
        leftLabel = new JLabel("", JLabel.CENTER);
        rightLabel = new JLabel("", JLabel.CENTER);

        leftLabel.setSize(350,100);
        rightLabel.setSize(350,100);

        downupButton = new JButton("go down/up");
        downupButton.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                Random random = new Random();
                int rand = random.nextInt(10) + 1;
                leftval -= rand;
                String val = Integer.toString(leftval);
                leftLabel.setText(val);
                rand = random.nextInt(10) + 1;
                rightval += rand;
                val = Integer.toString(rightval);
                rightLabel.setText(val);
            }
        });

        updownButton = new JButton("go up/down");
        updownButton.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                Random random = new Random();
                int rand = random.nextInt(10) + 1;
                leftval += rand;
                String val = Integer.toString(leftval);
                leftLabel.setText(val);
                rand = random.nextInt(10) + 1;
                rightval -= rand;
                val = Integer.toString(rightval);
                rightLabel.setText(val);
            }
        });

        controlPanel = new JPanel();
        controlPanel.setLayout(new FlowLayout());

        mainFrame.add(leftLabel);
        mainFrame.add(controlPanel);
        mainFrame.add(rightLabel);
        mainFrame.setVisible(true);
        controlPanel.add(updownButton);
        controlPanel.add(downupButton);
        mainFrame.setVisible(true);
    }
}

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