Java Design patterns

Java Design Patterns/creational/singleton/SingletonPatternDemo.java

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+package javadevjournal.design.creational.singleton;
+
+/**
+ * @author Kunwar
+ */
+public class SingletonPatternDemo {
+   public static void main(String[] args) {
+      /* Let's create 3 objects and see their hashcode and they will be same. */
+      System.out.println("in single threaded environment");
+      Singleton singleton1 = Singleton.getInstance();
+      Singleton singleton2 = Singleton.getInstance();
+      Singleton singleton3 = Singleton.getInstance();
+      System.out.println(singleton1.hashCode() +" "+ singleton2.hashCode() +" "+ singleton3.hashCode());
+
+      System.out.println("in multi threaded environment");
+      Thread1 t1 = new Thread1();
+      t1.run();
+      Thread2 t2 = new Thread2();
+      t2.run();
+      Thread3 t3 = new Thread3();
+      t3.run();
+
+   }
+}