Moving Box

[anilanar]

Hiya, I wrote a program that you move a box around using arrow keys. I figured how to move the box according to two keys pressed simultaneously like right and up. Here's the code:

public void keyReleased(KeyEvent evt){
		
		int rel = evt.getKeyCode();

		if(rel == KeyEvent.VK_UP) { 
			isUp = false;
		}
		if(rel == KeyEvent.VK_DOWN) {
			isDown = false;
		}
			
		if(rel == KeyEvent.VK_LEFT) {
			isLeft = false;
		} 
		if(rel == KeyEvent.VK_RIGHT) {
			isRight = false;
		}
		
	}

	public void keyPressed(KeyEvent evt) {
		
		key = evt.getKeyCode();


		if(key == KeyEvent.VK_LEFT) {
			
			if(isUp) { 
				squareY -= 5;
				if(squareY<3) squareY = 3;
			}
			
			if(isDown) {
				
				squareY += 5;
				if(squareY>getHeight()-43) squareY = getHeight() -43;
				
			}
			
			squareX -= 5;
			if(squareX<3) squareX = 3;
			isLeft = true;
			repaint();
		}
		
		if(key == KeyEvent.VK_RIGHT) {
			
			if(isUp) { 
				squareY -= 5;
				if(squareY<3) squareY = 3;
			}
			
			if(isDown) {
				
				squareY += 5;
				if(squareY>getHeight()-43) squareY = getHeight() -43;		
			}
			
			squareX += 5;
			if(squareX>getWidth()-43) squareX = getWidth()-43;
			isRight = true;
			repaint();
		}
		
		if(key == KeyEvent.VK_UP) {
			
			if(isRight) {
				squareX += 5;
				if(squareX>getWidth()-43) squareX = getWidth()-43;
			}
			
			if(isLeft) {
				squareX -= 5;
				if(squareX<3) squareX = 3;
			}
			
			
			squareY -= 5;
			if(squareY<3) squareY = 3;
			isUp = true;
			repaint();
		}
		
		if(key == KeyEvent.VK_DOWN) {
			
			if(isRight) {
				squareX += 5;
				if(squareX>getWidth()-43) squareX = getWidth()-43;
			}
			
			if(isLeft) {
				squareX -= 5;
				if(squareX<3) squareX = 3;
			}
			
			squareY += 5;
			if(squareY>getHeight()-43) squareY = getHeight() -43;
			isDown = true;
			repaint();
		}
	}

The problem is, for example: when I press UP + RIGHT, it goes that way ok cool, but when i release RIGHT, the box stops. I want it to keep going (to up in this case). Thank you :)

[mrmatt1111]

instead of handling the update position state on keyboard event, you could just record the event and have a seperate update thread that does the processing.

In other words, when keyboard happens then set a flag for up/down and left/right and have a thread that checks ever 50ms or so to update the position.

//inner class
private classs updateThread extends Thread
{
   public void run()
   {
      try
      {
          sleep(50); //sleep 50 ms
          ...
          //update pos on flags 
      }
      catch(Exception e) { ... }
   }
}

[anilanar]

I'm not familiar with threads, but I'll check some tutorials for it. Thank you.