1 /*
 2  * MySingleton.java
 3  *
 4  */
 5 
 6 package creational_patterns.my_singleton;
 7 
 8 /**
 9  *
10  * @author Sam Eldin
11  */
12 import java.lang.*;
13 import java.util.*;
14 import java.io.*;
15 
16 
17 public class MySingleton {
18     
19     private static MySingleton instance;
20     
21     /** Creates a new instance of MySingleton */
22     private MySingleton() {
23     }
24 
25     /*
26      *
27      */
28     private synchronized static void createAnInstance(){
29         if(null == instance){
30             instance = new MySingleton();
31             System.out.println("A new MySingleton is created");
32         }
33     }
34     /*
35      *
36      */
37     public  static MySingleton makeInstance(){
38         if(null == instance)
39             createAnInstance();
40         else
41            System.out.println("A copy of MySingleton is already created");
42         return instance;
43     }
44     /*
45      *
46      */
47     protected void finalize()  {
48         instance = null;
49         try {
50             super.finalize();
51         }
52         catch(Throwable myThrowable) {
53             System.out.println("finalize() catch clause");
54         }
55   }
56 }
57 
58