Java Quiz #45

Singleton.java

package com.quiz.pkg;

public class Singleton
{

	private static final Singleton INSTANCE = new Singleton();

	public static Singleton getInstance()
	{
		return INSTANCE;
	}

	private Singleton()
	{
		// <clinit> are the static initialization blocks for the class.
		if (!Thread.currentThread().getStackTrace()[2].getMethodName().equals("<clinit>"))
			throw new SecurityException();
	}

	public void sayHello()
	{
		System.out.println("Hello World !");
	}
}