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  1. #1
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    What is hashCode?

    What is hashCode?

  2. #2
    Registered User robertclark1's Avatar
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    A hashcode is a number generated from any object. This is what allows objects to be stored/retrieved quickly in a Hashtable. Imagine the following simple example: On the table in front of you you have nine boxes, each marked with a number 1 to 9.

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    A hashcode is a number generated from any object. This is what allows objects to be stored/retrieved quickly in a Hashtable. Imagine the following simple example: On the table in front of you you have nine boxes, each marked with a number 1 to 9.

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    In the Java programming language, every class implicitly or explicitly provides a hashCode() method, which digests the data stored in an instance of the class into a single hash value (a 32-bit signed integer). This hash is used by other code when storing or manipulating the instance – the values are intended to be evenly distributed for varied inputs for use in clustering.
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  5. #5
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    HashCode is a mathematical formula that returns some integer value. This integer value is used as index in array.

  6. #6
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    I think we use #hasteg in facbook, google plus, twitter and pintrest

  7. #7
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    hashCode() is used for bucketing in Hash implementations like HashMap, HashTable, HashSet, etc.

    The value received from hashCode() is used as the bucket number for storing elements of the set/map. This bucket number is the address of the element inside the set/map.
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  8. #8
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    A hashcode is a number generated from any object. This is what allows objects to be stored/retrieved quickly in a Hashtable. Imagine the following simple example: On the table in front of you you have nine boxes, each marked with a number 1 to 9.

  9. #9
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    Hashcode is a digit generated from any object. This is what allows objects to be retrieved quickly in a Hash table.

  10. #10
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    A hashcode is a number produced from any article. This is the thing that permits articles to be put away/recovered rapidly in a Hashtable. Envision the accompanying straightforward case: On the table before you have nine boxes, each set apart with a number 1 to 9.

  11. #11
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    A hashcode is a number generated from any object. This is what allows objects to be stored/retrieved quickly in a Hashtable.
    Imagine the following simple example:
    On the table in front of you you have nine boxes, each marked with a number 1 to 9. You also have a pile of wildly different objects to store in these boxes, but once they are in there you need to be able to find them as quickly as possible.
    What you need is a way of instantly deciding which box you have put each object in. It works like an index; you decide to find the cabbage so you look up which box the cabbage is in, then go straight to that box to get it.
    Now imagine that you don't want to bother with the index, you want to be able to find out immediately from the object which box it lives in.
    In the example, let's use a really simple way of doing this - the number of letters in the name of the object. So the cabbage goes in box 7, the pea goes in box 3, the rocket in box 6, the banjo in box 5 and so on. What about the rhinoceros, though? It has 10 characters, so we'll change our algorithm a little and "wrap round" so that 10-letter objects go in box 1, 11 letters in box 2 and so on. That should cover any object.
    Sometimes a box will have more than one object in it, but if you are looking for a rocket, it's still much quicker to compare a peanut and a rocket, than to check a whole pile of cabbages, peas , banjos and rhinoceroses.
    That's a hash code. A way of getting a number from an object so it can be stored in a Hashtable. In Java a hash code can be any integer, and each object type is responsible for generating its own. Lookup the "hashCode" method of Object.

  12. #12
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    Quote Originally Posted by RH-Calvin View Post
    In the Java programming language, every class implicitly or explicitly provides a hashCode() method, which digests the data stored in an instance of the class into a single hash value (a 32-bit signed integer). This hash is used by other code when storing or manipulating the instance – the values are intended to be evenly distributed for varied inputs for use in clustering.
    Thank You Very Much...for all valuable explanation

  13. #13
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    A hash code is a numeric value that is used to identify an object during equality testing.

  14. #14
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    Hashcode is a number produced from any item. This is what allows things to be recovered easily in a Hash desk.

  15. #15
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    A hashcode is a number generated from any object. This is what allows objects to be stored/retrieved quickly in a Hashtable. Imagine the following simple example: On the table in front of you you have nine boxes, each marked with a number 1 to 9.

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