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Java example program to get the object's ID



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You are wrong
There are no Object Ids in Java. The HashCode value of an object is not unique. Different objects can have the same hash value. Take a look at the Java plattform documentation. 

Good Examples
We can find really good examples here. 

Invalid assumption
You state that hashCode will provide a unique identifier for every object. But this is incorrect. It is perfectly possible for two different objects to share the same hashcode. 

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