Mouselistener does nothing

Question

So, I wrote this code in java. It should print "Click" when I click the mouse button, but does nothing.

import java.awt.Graphics; import java.awt.event.MouseEvent; import java.awt.event.MouseListener; import java.util.ArrayList; import java.util.List; import javax.swing.ImageIcon; import javax.swing.JPanel; public class mainPanel extends JPanel implements MouseListener { List<Integer> listLoc; List<ImageIcon> listImg; ImageIcon objPpc; ImageIcon ttlSpace; public mainPanel(){ loadImg(); fillBck(ttlSpace); addTtl(objPpc, 1); repaint(); } public void fillBck(ImageIcon fillingImg){ for(int i = 0; i < 16; i++){ addTtl(fillingImg, i); } } public void loadImg(){ objPpc = new ImageIcon ("img/obj/ppcBuild1.png"); ttlSpace = new ImageIcon ("img/ttl/spaceBuild1.png"); listLoc = new ArrayList<Integer>(); listImg = new ArrayList<ImageIcon>(); } public void addTtl(ImageIcon addedImg, int addedLoc){ System.out.println("----- addTtl -----"); System.out.println(addedImg); listImg.add(addedImg); System.out.println(addedLoc); listLoc.add(addedLoc); System.out.println("----- /addTtl -----"); System.out.println(""); } public void paint (Graphics g){ super.paint(g); for (int i = 0; i < listImg.size(); i ++) { g.drawImage((listImg.get(i)).getImage(), (listLoc.get(i) * (this.getWidth() / 16)), 0, (this.getWidth() / 16) , this.getHeight(), null); } } @Override public void mouseClicked(MouseEvent e) { // TODO Auto-generated method stub System.out.println("Mouse Click"); } @Override public void mouseEntered(MouseEvent e) { // TODO Auto-generated method stub } @Override public void mouseExited(MouseEvent e) { // TODO Auto-generated method stub } @Override public void mousePressed(MouseEvent e) { // TODO Auto-generated method stub } @Override public void mouseReleased(MouseEvent e) { // TODO Auto-generated method stub } } 

The java console only prints this and does not contain error codes:

 ----- addTtl ----- img/ttl/spaceBuild1.png 0 ----- /addTtl ----- ----- addTtl ----- img/ttl/spaceBuild1.png 1 ----- /addTtl ----- ----- addTtl ----- img/ttl/spaceBuild1.png 2 ----- /addTtl ----- ----- addTtl ----- img/ttl/spaceBuild1.png 3 ----- /addTtl ----- ----- addTtl ----- img/ttl/spaceBuild1.png 4 ----- /addTtl ----- ----- addTtl ----- img/ttl/spaceBuild1.png 5 ----- /addTtl ----- ----- addTtl ----- img/ttl/spaceBuild1.png 6 ----- /addTtl ----- ----- addTtl ----- img/ttl/spaceBuild1.png 7 ----- /addTtl ----- ----- addTtl ----- img/ttl/spaceBuild1.png 8 ----- /addTtl ----- ----- addTtl ----- img/ttl/spaceBuild1.png 9 ----- /addTtl ----- ----- addTtl ----- img/ttl/spaceBuild1.png 10 ----- /addTtl ----- ----- addTtl ----- img/ttl/spaceBuild1.png 11 ----- /addTtl ----- ----- addTtl ----- img/ttl/spaceBuild1.png 12 ----- /addTtl ----- ----- addTtl ----- img/ttl/spaceBuild1.png 13 ----- /addTtl ----- ----- addTtl ----- img/ttl/spaceBuild1.png 14 ----- /addTtl ----- ----- addTtl ----- img/ttl/spaceBuild1.png 15 ----- /addTtl ----- ----- addTtl ----- img/obj/ppcBuild1.png 1 ----- /addTtl ----- 

When I press any mouse button (even the [MOUSE3] wheel) on the screen, it does nothing.

How can i fix this?

Answer 1

Your code never adds MouseListener to the panel. You should have this line somewhere:

 this.addMouseListener(this); 

When you implement MouseListener, it means that you can listen to mouse events. To listen for mouse events, the listener must be added (registered) to some component that emits mouse events.

Answer 2

You need to register mouseListener add

 addMouseListener(this); 

Also see

• Tutorials for mouse listeners