Collision detection and Thread.sleep()

Game Mechanics
#1

I\m trying to create a simple platformer and trying to do collision detection with platforms. Also using the following gameloop “run()”. Unfortunately when I try to match player (x, y) coordinates with platforms (x, y) coordinates, because of Thread.sleep(10) (I think, but not sure.), the character skips it like 9/10 times and no collision happens.

If I remove Thread.sleep(), collision happens accurately, but when I move my character, he starts moving with immense speed. Could anyone please advise how to account for this?


public void run(){
        long previous = 0, start = 0;
        double delta = 1;
        
         while(true){
            start = System.nanoTime(); 
            
            if(previous != 0){
                delta = start - previous;
            }  
            
            doGameUpdates(delta); 
            
            
            try {
                Thread.sleep(10);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            
            
            previous = start;
            repaint();
        }        
    }

private void doGameUpdates(double delta){
        
        
        for(Platform p : plats){
            if(player.collidesWithPlatform(p)==true){
               //Do something
            }
        }
        player.Move(delta);
        
    }