singleton.java

package com.silvenga.singleton;

import java.util.Random;

public class RandomSingleton
	
	// Basic interface for a Singleton
	public static Random getInstance() {
	
		// Return the instance of Random created in RandomContainer
		return Container.randomInstance;
	}

	// We use an enum for lazy loading. Load a new instance once and only when needed
	// Making a Singleton this way prevents any attempt of making multiple instances
	private static enum Container {
		
		// Required to prevent compiler optimization
		INSTANCE; 
		
		// When the Enum is first accessed it will create
		// a static instance of Random
		private static Random randomInstance = new Random(); 
	}
}