Keyboard buttons

Processing Coding Questions
3

If you are doing more than a few keys, another general option is to use implement @TfGuy44’s boolean approach using a HashMap.

import java.util.Map;
HashMap<Character,Boolean> flags = new HashMap<Character,Boolean>();

Any key that gets pressed, put it in the map with a true… any key that gets released, take it out with a false.

void keyPressed(){
  flags.put(key, Boolean.TRUE);
}
void keyReleased(){
  flags.put(key, Boolean.FALSE);
}

This can be used for simultaneous keypresses – or for a large collection of toggles:

void keyReleased(){
  if(flags.get(key)!=null){
    flags.put(key, !(flags.get(key)));
  } else {
    flags.put(key, Boolean.TRUE);
  }
}