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Java - Code Samples

 Sample 1. Singleton Class ( using private constructor , object initialization using static method, doubly checked , thread safe, synchronized , volatile reference )

class Singleton {
private static volatile Singleton instance = null;
private Singleton(){}
public static Singleton getInstance() {
if (instance == null) {
synchronized(Singleton.class) {
if (instance== null)
instance = new Singleton();
}
}
return instance;
}
}

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