KeyPress - OpenProcessing

mySketch
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boolean aTyped = false;   // for character keys, 
boolean rightArrowTyped = false;
​
void setup () {
  size (300, 300);
}
​
void draw () {
  background (100, 100, 250);
  
  if (aTyped) {
    background (240, 10, 100);
  }
  
  if (rightArrowTyped) {
    ellipse (width/2, height/2, 50, 50);
  }
  text ("Press - A | Right Arrow", width/3-10, 30);
}
​
void keyPressed () {
  if (key == 'a') {   // single apostrophy 
    aTyped = true;
    //println ("pressed");
  }
  
  if (keyCode == RIGHT) {   // reserved variables for shift, arrow keys 
    rightArrowTyped = true;
  }
}
​
void keyReleased () {
  if (key == 'a') {
    aTyped = false;
    //println ("released");
​
  }
  
  if (keyCode == RIGHT) {
    rightArrowTyped = false;
  }
}