What is synchronization ?
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 Q1. What is synchronization ?Core Java
 This question was recently asked at 'ABS'.This question is still unanswered. Can you please provide an answer.


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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;
}
 What is meant by "Vector is synchronized and ArrayList isn't " ?
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