Logger

Logger.java

public class Logger {

	private Level level = Level.WARNING;

	public void setLevel(Level level) {
		this.level = level;
	}

	public void log(Level level, { => String} message) {
		if (this.level == level) {
			String loggableMessage = message.invoke();
			log(loggableMessage);
		}
	}

	public void log(String message) {
		System.out.println(message);
	}

}