MouseListener无法正常工作

Question

My Mouse Released is not working. In my code there are two JPanels(p1 and p2) in another JPanel(p). and there are two Buttons named RED and GREEN. My Code should work like when someone click the Buttons, The Panels should be changed Dynamically . But unfortunately When I am running my program, the Button "RED" and "GREEN" is not responding. Here I have Added my codes. Thank you.

package animat;

import java.awt.Color;
import java.awt.event.*;

import javax.swing.*;



public class Animat extends JFrame{

Animat(){


JFrame j=new JFrame();

j.setSize(400,400);
j.setVisible(true);
JPanel p=new JPanel();

p.setSize(300,400);
p.setLayout(null);
p.setBackground(Color.BLACK);
p.setVisible(true);
j.add(p);

JPanel p1=new JPanel();
p1.setBounds(0,50,400,350);
p1.setBackground(Color.red);
p1.setVisible(true);
p.add(p1);

JPanel p2=new JPanel();
p2.setBounds(0,50,400,350);
p2.setBackground(Color.GREEN);
p2.setVisible(true);
p.add(p2);

JButton b=new JButton("RED");
b.setBounds(0,0,100,50);
b.setVisible(true);
p.add(b);

JButton b1=new JButton("GREEN");
b1.setBounds(100,0,100,50);
b1.setVisible(true);
p.add(b1);

b.addMouseListener(new MouseAdapter(){
public void MouseReleased(MouseEvent e){
p.removeAll();
p.repaint();
p.revalidate();
p.add(p1);
}
});

b1.addMouseListener(new MouseAdapter(){
public void MouseReleased(MouseEvent e){
p.removeAll();
p.repaint();
p.revalidate();
p.add(p2);
}
});
}
public static void main(String[] args) {
   new Animat(); 
   }

}

Answer 1

You are - by accident - not overriding the function you meant to.

With this code:

b1.addMouseListener(new MouseAdapter(){
   public void MouseReleased(MouseEvent e){
      p.removeAll();
      p.repaint();
      p.revalidate();
      p.add(p2);
   }
});

You are adding a new function, instead of overriding the mouseReleased function. Hence it is never called. Just change the function-name to start with lower-case and it will work.

Note #1: You can verify my statement below by adding the @Override annotation to your function. You will be told by your IDE that you are in fact not overriding anything (due to the typo) Note #2: You should be probably using mousePressed instead. It is more logical in this case (but your code works as well)