New Singleton class

Thread-safe and lazy loading.

singleton/src/main/java/com/iluwatar/SingletonClass.java

@@ -0,0 +1,18 @@
+package com.iluwatar;
+
+public class SingletonClass {
+
+	private static SingletonClass singletonInstance = null;
+
+	public synchronized static SingletonClass getSingleton() {
+		/*
+		 * The instance gets created only when it is called for first time.
+		 * Lazy-loading
+		 */
+		if (singletonInstance == null) {
+			singletonInstance = new SingletonClass();
+		}
+
+		return singletonInstance;
+	}
+}