When you will synchronize a piece of your code?
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Java - Interview Questions and Answers

 Q1. When you will synchronize a piece of your code?
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Ans. When you expect your code will be accessed by different threads and these threads may change a particular data causing data corruption.

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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;
}

//Single checked locking code
public static Singleton createInstance() {
   synchronized(Singleton.class) {
      if(singleton == null) {
         singleton = new Singleton();
      }
   }
   return singleton;
}
 How can we ensure thread safety in static method ?
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