Initial data commit

Task/Singleton/Java/singleton-2.java

@@ -0,0 +1,13 @@
+public class Singleton {
+    private Singleton() {
+        // Constructor code goes here.
+    }
+
+    private static class LazyHolder {
+        private static final Singleton INSTANCE = new Singleton();
+    }
+
+    public static Singleton getInstance() {
+        return LazyHolder.INSTANCE;
+    }
+}