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Thread: why my code does not work ?? ://

  1. #1
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    Default why my code does not work ?? ://

    //this program must draw line in a panel using mouse events .. 
     
     
    import java.awt.*;
    import java.awt.event.MouseAdapter;
    import java.awt.event.MouseEvent;
    import java.awt.event.MouseListener;
    import java.awt.geom.Line2D;
    import javax.swing.JFrame;
    import javax.swing.JPanel;
     
    public class MouseTest {
    	public static void main(String [] args)
    	{
    		MouseFrame frame = new MouseFrame() ;
    		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE) ;
    		frame.show() ;
    	}
     
    }
    	 class MouseFrame extends JFrame
    	{
    		MouseFrame()
    		{
    		  setTitle("Mouse"	) ;
    		  setSize(DEFAULT_WIDTH , DEFAULT_lENGTH) ;
    		  MousePanel panel = new MousePanel() ;
    		  Container contentPane = getContentPane() ;
    		  contentPane.add(panel) ;
    		}
    		public static final int DEFAULT_WIDTH = 350 ;
    		public static final int DEFAULT_lENGTH = 350 ;
    	}
     
     
     
    	 class MousePanel extends JPanel
    	 {
    		 Line2D line ;
     
    		 public MousePanel()
    		 {
     
    			addMouseListener(new MouseHandler()) ;
     
    		 }
     
     
    		 public void paintComponent(Graphics g)
    		 {
     
     
    			 super.paintComponent(g);
    			 Graphics2D g1 =(Graphics2D) g ;
    			 if(line!=null)
    			 {
    			 g1.draw(line) ;
    			 }
     
     
    		 }
     
    		 private class MouseHandler extends MouseAdapter
    		 {
    			 public void MousePressed( MouseEvent event)
    			 {
    				 line = new Line2D.Double(0 , 0 , event.getX() , event.getY()) ;
    				 repaint() ;
     
    			 } 
    		 }
    	 }
    Last edited by without name; May 6th, 2014 at 02:14 PM.


  2. #2
    Super Moderator Norm's Avatar
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    Default Re: why my code does not work ?? ://

    Please edit your post and wrap your code with code tags:
    [code=java]
    YOUR CODE HERE
    [/code]
    to get highlighting and preserve formatting.

    What happens when the code is compiled and executed?
    If you don't understand my answer, don't ignore it, ask a question.

  3. The Following User Says Thank You to Norm For This Useful Post:

    without name (May 6th, 2014)

  4. #3
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    Default Re: why my code does not work ?? ://

    gyna.jpg

    this photo will show you what happened ..
    just screen without any lines ..
    when i click on the mouse .. nothing happened ..

  5. #4
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    Default Re: why my code does not work ?? ://

    any help ?? please .. ://

  6. #5
    Super Moderator Norm's Avatar
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    Default Re: why my code does not work ?? ://

    Please edit your post and wrap your code with code tags:
    [code=java]
    YOUR CODE HERE
    [/code]
    to get highlighting and preserve formatting.
    If you don't understand my answer, don't ignore it, ask a question.

  7. #6
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    Default Re: why my code does not work ?? ://

    excuse me .. how can i make it ?

  8. #7
    Super Moderator Norm's Avatar
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    Default Re: why my code does not work ?? ://

    1) edit the post
    2) put
    [code]
    in front of the code
    2) put
    [/code]
    after the code
    2) Press save
    If you don't understand my answer, don't ignore it, ask a question.

  9. The Following User Says Thank You to Norm For This Useful Post:

    without name (May 6th, 2014)

  10. #8
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    Default Re: why my code does not work ?? ://

    thaaanks .. done
    waiting your help .. ^_^

  11. #9
    Super Moderator copeg's Avatar
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    Default Re: why my code does not work ?? ://

    Java - as with just about any programming language - is case sensitive. In other words, do all your methods that inherit from a parent class actually override the parent method signature?

  12. The Following User Says Thank You to copeg For This Useful Post:

    without name (May 6th, 2014)

  13. #10
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    Default Re: why my code does not work ?? ://

    yes .. i think that ..
    there is no errors in the code ..
    it just doesn't work well ..

  14. #11
    Super Moderator copeg's Avatar
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    Default Re: why my code does not work ?? ://

    Add some print line to debug - does the method you think should get called actually get called? If not, why might this be (see post #9)?

  15. #12
    Super Moderator Norm's Avatar
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    Default Re: why my code does not work ?? ://

    Also it is important to add the @Override annotation before any method you override so the compiler can verify that the override is valid.
    If you don't understand my answer, don't ignore it, ask a question.

  16. #13
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    Default Re: why my code does not work ?? ://

    i can't understand what you say ..
    can you speak arabic ??
    my language is arabic ..
    i can speak and understand english but not very good :/ !

  17. #14
    Super Moderator Norm's Avatar
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    Default Re: why my code does not work ?? ://

    From Google translate:
    أيضا من المهم لإضافة الشرح @ قبل أي تجاوز الأسلوب الذي تجاوز حتى المترجم يمكن أن تحقق من أن التجاوز غير صالحة.
    If you don't understand my answer, don't ignore it, ask a question.

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