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difference between hash code and reference or address of an object?
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Two different Objects can have same hashCode . A reference is a unique pointer to an object where hashCode is a convenient computed attribute.
A hash code is an integer value that is associated with each object in Java. Its main purpose is to facilitate hashing in hash tables, which are used by data structures like HashMap.
The value returned by hashCode() is by no means guaranteed to be the memory address of the object. According to Java API, the calculation of hashcode is based on 32-bit internal JVM (Java Virtual Machine) address of the Object. It is true that the object moves during execution. But hashcode does not change.
What Does Hash Code Mean? Hash code in . NET framework is a numeric value which helps in identification of an object during equality testing and also can serve as an index for the object. The value contained in the hash code is not permanent in nature.
In JavaME, these three things are unrelated.
An object's hashCode is a semi-unique identifier for it.
A reference to an object is a scoped handle on that object.
An object's address is (probably) unobtainable, and certainly useless.
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