Thread: 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() ;
 
			 } 
		 }
	 }

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?

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

1) edit the post
2) put
[code]
in front of the code
2) put
[/code]
after the code
2) Press save

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?

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)?

Also it is important to add the @Override annotation before any method you override so the compiler can verify that the override is valid.

From Google translate:
أيضا من المهم لإضافة الشرح @ قبل أي تجاوز الأسلوب الذي تجاوز حتى المترجم يمكن أن تحقق من أن التجاوز غير صالحة.