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. 

Java example program to get the object's ID
Java example program to get the object's ID       java get Object id In java there is no any specific method that provides us the object's ID. But each object has its own unique 

Java Get Example
example program to get the object's ID In java there is no any specific method....    Java example to get Graphics In this section you... example to get Object class name at runtime In java there is a way that makes us 

Java Get Example
example program to get the object's ID In java there is no any specific method....    Java example to get Graphics In this section you... example to get Object class name at runtime In java there is a way that makes us 

Get Session Id
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Java example to get Object class name at runtime
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Java Servlet : Get URL Example
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Java file get name
Java file get name In this section, you will learn how to get the name of the file. Description of code: You can see in the given example, we have created an object of File class and specified a file in the constructor. Then we have 

Java file get size
Java file get size In this section, you will learn how to get the size of a file. Description of code: You can see in the given example, we have created... is: " + filesizeInKB + " KB"); } } Through the method length(), you can get 

In Java how to get size of class and object?
In Java how to get size of class and object?  In Java how to get size of class and object