ControlHandler.java

/*
The following class is hereby released into the public domain under a CC0 public domain dedication.
To the greatest extent permitted by law, I hereby fully, permanently, irrevocably, and unconditionally
waive all copyright protection that may apply to this class.
*/

import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;

import java.util.*;

public final class ControlHandler implements KeyListener{
	private static ControlHandler i;
	private ControlHandler(){};
	public static ControlHandler getInstance(){
		if(i==null)i=new ControlHandler();
		return i;
	}
	private static final Map<Integer,Boolean>keys=new HashMap<>();
	@Override 
	public void keyPressed(KeyEvent arg0) {
		keys.put(arg0.getKeyCode(),true);	
	}
	@Override
	public void keyReleased(KeyEvent arg0) {
		keys.put(arg0.getKeyCode(),false);
	}
	@Override
	public void keyTyped(KeyEvent arg0) {}
	
	public static boolean isKeyDown(int code){
		return keys.getOrDefault(code,false);
	}
	public static boolean isKeyDown(char key){
		return isKeyDown(KeyEvent.getExtendedKeyCodeForChar(key));
	}
}

SuperJedi224 what does G,3,1,3, G,2,2,3, and G,2,1,4 equal to in your Graham's Sequence? How do you make the 4th entry go up? On your website almost infinite. I'm having trouble understanding the 4th entry.