Is there any chance of accessing object from hashcode without hashTable in java?

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Suppose I have an Object obj1. Now I have its hashCode() stored in variable. Now I want to access obj1 through hashcode only.

Means get a reference of that object. Is there way of doing such way!!!

Posted 26-Dec-14 0:51am

28shivamsharma

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**Zoltán Zörgő** · Accepted Answer · 2014-12-26T01:15:00

Solution 1

Hastables[^] are just a form of collection. It is like an associative array. It des not replace references, but it is using references. The hashcode is used do generate a kind of index to the object, but the object itself is linked into the structure by it's reference. If no reference is kept to an object the garbage collector will destroy it. So if you loose all references, you can't access the object anymore. The hashcode is just a calculated property of an object (returned by a method), nothing more.

So, shortly: no.

But why do you think you need this?

Posted 26-Dec-14 1:15am

Zoltán Zörgő

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28shivamsharma 26-Dec-14 10:02am

Thanks for answer! Is there no chance to get object from any source!!!

Zoltán Zörgő 26-Dec-14 11:29am

Again: what is the exact situation where you need this?

28shivamsharma 26-Dec-14 16:42pm

I wanna to implement XOR linked list [http://en.wikipedia.org/wiki/XOR_linked_list] in java. Sorry for asking again.

Zoltán Zörgő 26-Dec-14 16:44pm

And why do you need the hashcode? Why don't you use the reference itself?
... I got it, you can't xor a reference...
As you can see on that page, GC is not a friendly environment for such lists :(

Zoltán Zörgő 26-Dec-14 16:48pm

Well, you will need unsafe code to have addresses instead of references. See this one: http://josephkirwin.com/category/xor-linked-list/

28shivamsharma 26-Dec-14 16:52pm

Thanks!! But I have already read that. I was hoping that there must be another way.. :(

Zoltán Zörgő 26-Dec-14 16:53pm

I doubt :(
C# is just not for that.