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leJOS (pronounced like the Spanish word "lejos" for "far") is a tiny Java Virtual Machine. In 2013 it was ported to the LEGO EV3 brick.

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package lejos.internal.ev3;

import lejos.hardware.LED;
import lejos.internal.io.NativeDevice;

public class EV3LED implements LED {	
	private static NativeDevice dev = new NativeDevice("/dev/lms_ui");
	public static int COLOR_NONE = 0;
  public static int COLOR_GREEN = 1;
  public static int COLOR_RED = 2;
  public static int COLOR_ORANGE = 3;
  public static int PATTERN_ON = 0;
  public static int PATTERN_BLINK = 1;
  public static int PATTERN_HEARTBEAT = 2;
	

	@Override
	public void setPattern(int pattern) {
		byte [] cmd = new byte[2];
	      
		cmd[0] = (byte)('0' + pattern);
		dev.write(cmd, cmd.length);	
	}
	
	public void setPattern(int color, int pattern) {
	  if (color == 0 ) {
	    setPattern(0);
	  }
	  else {
	    setPattern(pattern * 3 + color);
	  }
	}
}