MouseListener interface and MouseEvent class in java
 //MouseListener interface and MouseEvent class import java.awt.*; import java.awt.event.*; import javax.swing.*; /* <applet code = "MouseListener_and_MouseEvent" width = 200 height = 200></applet> */ public class MouseListener_and_MouseEvent extends JApplet implements MouseListener {     Container con;     public void init()     {         con = getContentPane();         con.setLayout(new FlowLayout());         addMouseListener(this);     }     public void mouseEntered(MouseEvent me)     {         con.setBackground(Color.red);     }     public void mouseExited(MouseEvent me)     {         con.setBackground(Color.green);     }     public void mousePressed(MouseE...