Question

Consider the following Java program. Describe what it does in response to specific operations of the mouse, and how it does it. (You are encouraged to run the program for yourself to test its behavior. Then read through the program carefully to understand how that behavior arises.)

import java.awt.event.*;
import javax.swing.*;
public class MouseWhisperer extends JFrame implements MouseListener {
    MouseWhisperer() {
        super("COME CLOSER");
        setSize(300,100);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        addMouseListener(this);
        setVisible(true);
    }
    public void mouseClicked(MouseEvent e) { setTitle("OUCH"); }
    public void mousePressed(MouseEvent e) { setTitle("LET GO"); }
    public void mouseReleased(MouseEvent e) { setTitle("WHEW"); }
    public void mouseEntered(MouseEvent e) { setTitle("I SEE YOU"); }
    public void mouseExited(MouseEvent e) { setTitle("COME CLOSER"); }
    public static void main(String[] args) { new MouseWhisperer(); }
}

Answer 1

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

public class MouseWhisperer extends JFrame implements MouseListener {
    
    MouseWhisperer() {
        super("COME CLOSER"); // The title of the window at the start
        setSize(300, 100);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        addMouseListener(this);
        setVisible(true);
    }
    
    // this method gets called when mouse is clicked (after release of button)
    public void mouseClicked(MouseEvent e) {
        setTitle("OUCH");
    }

    // This gets called as soon as we start clicking the mouse
    public void mousePressed(MouseEvent e) {
        setTitle("LET GO");
    }

    // Gets called when mouse button is released
    public void mouseReleased(MouseEvent e) {
        setTitle("WHEW");
    }

    // When mouse comes from outside the panel to inside the panel
    public void mouseEntered(MouseEvent e) {
        setTitle("I SEE YOU");
    }

    // Gets called when mouse goes out of the panel
    public void mouseExited(MouseEvent e) {
        setTitle("COME CLOSER");
    }
    
    
    /*
     * Lifecycle:
     * 1. MouseEntered (Comes inside panel)
     * 2. mousePressed
     * 3. mouseReleased
     * 4. mouseClicked
     * 5. mouseExited (Leave panel)
     */

    public static void main(String[] args) {
        new MouseWhisperer();
    }
}

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