Java Programming

I have a picture of a little stick figure man and i want to make it appear as if he is jumping.
The code I have to do that is this:

		switch(e.getKeyCode()){
			case KeyEvent.VK_UP:
				for(int i=0; i<=10; i=i+1){
					y = y+1;  //the int y represents the images position of the y-axis
					repaint();
					try{Thread.sleep(200);}
						catch(InterruptedException ie){}
						
					if(i == 10){
						for(int j=0; j<=10; j=j+1){
							y = y-1;
							repaint();
							try{Thread.sleep(200);}
							catch(InterruptedException ie){}
						}
						break;
					}
				}
				break;

but for some reason the image just stays in one place and does not have the jumping effect I wanted.
(proabably has to do with the Thread.sleep(200); method I called, but I dont know how to fix it).

Thanks in advance!