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

public class MouseLocator extends JFrame implements MouseListener {
    
    JPanel p;
    int previousX = 0, previousY = 0;
    
    public MouseLocator() {
        this.setSize(400, 400);
        this.setTitle("Mouse Locator");
        
        setupUI();
        
        this.setDefaultCloseOperation(EXIT_ON_CLOSE);
        this.setVisible(true);
    }
    
    public void setupUI () {
        p = new JPanel();
        p.setBackground(Color.YELLOW);
        p.addMouseListener(this);
        
        Container cp = this.getContentPane();
        cp.add(p, BorderLayout.CENTER);
    }
    
    public void mouseClicked(MouseEvent e)  {
        int currentX = e.getX();
        int currentY = e.getY();
        
        Graphics g = p.getGraphics();
        g.drawLine(previousX, previousY, currentX, currentY);
        
        previousX = currentX; previousY = currentY;
    }
        
    public void mouseEntered(MouseEvent e) {
        p.setBackground(Color.GREEN);
    }
        
    public void mouseExited(MouseEvent e) {
        p.setBackground(Color.YELLOW);
    }
        
    public void mousePressed(MouseEvent e) {
        
    }
          
    public void mouseReleased(MouseEvent e) {
        
    }
        

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