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Thread: MouseListener

  1. #1
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    Default MouseListener

    import java.awt.Graphics;
    import java.awt.event.MouseListener;
    import java.awt.event.MouseMotionListener;
     
    import javax.swing.JFrame;
     
     
     
    public class MouseEvent implements MouseListener,MouseMotionListener
    {
     
    	static JFrame f = new JFrame();
    	String msg = " ";
    	int mouseX = 0,mouseY = 0;
     
    	public void init()
    	{
    		f.addMouseListener(this);
    		f.addMouseMotionListener(this);
     
    	}
     
    	@Override
    	public void mouseDragged(java.awt.event.MouseEvent arg0) {
    		// TODO Auto-generated method stub
     
    	}
     
    	@Override
    	public void mouseMoved(java.awt.event.MouseEvent arg0) {
    		// TODO Auto-generated method stub
     
    	}
     
    	@Override
    	public void mouseClicked(java.awt.event.MouseEvent e) {
    		// TODO Auto-generated method stub
    		mouseX = 0;
    		mouseY = 10;
    		msg = "Mouse clicked";
    		f.repaint();
    		System.out.println("Mouse clicked");
     
    	}
     
    	@Override
    	public void mouseEntered(java.awt.event.MouseEvent e) {
    		// TODO Auto-generated method stub
     
    	}
     
    	@Override
    	public void mouseExited(java.awt.event.MouseEvent e) {
    		// TODO Auto-generated method stub
     
    	}
     
    	@Override
    	public void mousePressed(java.awt.event.MouseEvent e) {
    		// TODO Auto-generated method stub
     
    	}
     
    	@Override
    	public void mouseReleased(java.awt.event.MouseEvent e) {
    		// TODO Auto-generated method stub
     
    	}
     
    	public void repaint(Graphics g)
    	{
    		g.drawString(msg,mouseX,mouseY);
     
    	}
     
    	   public static void main(String[] args) {
     
    		   	MouseEvent me = new MouseEvent();
    		   	me.init();
    		   	f.pack();
    	    	f.setVisible(true);
    	   }
     
     
     
    }
    The message is not shown on the frame.


  2. #2
    Super Moderator Norm's Avatar
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    Default Re: MouseListener

    Can you explain what you expect the posted code to do? For example what code is supposed to call the repaint() method defined in your MouseEvent class?

    BTW Using the class name of a Java SE class (MouseEvent) is a bad idea. Your class names should be unique.
    If you don't understand my answer, don't ignore it, ask a question.

  3. #3
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    Default Re: MouseListener

    The code,which i think,should print a message on the frame that the "Mouse is clicked",when the mouse is clicked. The repaint() will get called when the mouse is clicked.

  4. #4
    Super Moderator Norm's Avatar
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    Default Re: MouseListener

    The repaint() will get called when the mouse is clicked.
    There are two different repaint() methods. One without arguments and one with. The one without args belongs to the Component class. It is called in the mouseClicked() method. The posted code has the other repaint() method with the argument. The one with the argument is not called anywhere that I can see in the posted code. If it is not called, the drawString method will not be called.

    Your repaint() method is not in a component that is being displayed on any GUI like a JFrame. You need to look at how GUI coding works.
    Perhaps the tutorials:
    http://docs.oracle.com/javase/tutori...ing/index.html
    Last edited by Norm; June 23rd, 2012 at 09:31 PM.
    If you don't understand my answer, don't ignore it, ask a question.

  5. #5
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    Default Re: MouseListener

    what is @overide? explain?

  6. #6
    Super Moderator pbrockway2's Avatar
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    Default Re: MouseListener

    It's @Override: an annotation. See Annotations in Oracle's Tutorial.
    Last edited by pbrockway2; June 30th, 2012 at 02:23 AM.

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