I want to make my program to read which button is released when the "keyReleased" void is called. I'm using this code right know but it doesn't seem to work (it isn't making the booleans "false"). What am I doing wrong?

2. void keyReleased(){
3.  if (key == UP){
4.     keyUp = false;
5.  }
6.   else if (key == DOWN){
7.     keyDown = false;
8.   }
9.   else if (key == LEFT){
10.     keyLeft = false;
11.   }
12.   else if (key == RIGHT){
13.     keyRight = false;
14.   }
15. }
16.     

I've been searching for this kind of problems and I found out that I should do as I've done know. But as I said that doesn't work very good.