When singleton can break and how to resolve it

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Q1. When singleton can break and how to resolve it

^{2019-05-03 07:57:33}

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//Double Checked Locking Code
public static Singleton createInstance() {
   if(singleton == null){
      synchronized(Singleton.class) {
         if(singleton == null) {
            singleton = new Singleton();
         }
      }
   }
   return singleton;
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   synchronized(Singleton.class) {
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   }
   return singleton;
}

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