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Questions tagged hashcode

40 questions

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11
votes
4
answers

hashcode() and equals() method

java equals hashcode hashset
asked 2013-07-29T08:40:33.773
37
votes
5
answers

Is it proper for equals() to depend only on an ID?

java oop overriding equals hashcode
asked 2013-06-08T20:16:19.483
38
votes
1
answers

What's behind the hashCode() method for String in Java?

java hashcode
asked 2013-03-20T08:18:26.887
8
votes
2
answers

Why in Enum hashCode() refers to the Object hashCode() implementaion, instead of ordinal() function?

java enums hashcode jls
asked 2013-03-06T07:53:50.310
10
votes
6
answers

Java hashCode() method override is not needed if we don't use hashmap or hashset

java equals hashcode
asked 2013-02-08T20:35:31.437
8
votes
7
answers

hashCode() purpose in Java

java hashcode
asked 2013-02-06T17:32:07.047
22
votes
2
answers

"Normalizing" BigDecimal's hash code: howto?

java guava hashcode bigdecimal
asked 2013-01-14T02:33:22.650
9
votes
3
answers

Is there any reason to use Apache HashCodeBuilder over Objects.hash?

java hashcode
asked 2012-11-29T20:09:25.290
13
votes
2
answers

Using a larger prime as a multiplier when overriding hashCode()

java hash hashcode primes
asked 2012-08-22T15:48:21.737
8
votes
2
answers

Java: Only check hashCode in equals() of immutable object

java equals immutability guava hashcode
asked 2012-04-18T00:23:21.690
8
votes
5
answers

Different Enum HashCode generation?

java interface enums hashcode
asked 2012-02-24T18:18:12.203
44
votes
4
answers

What is the difference between `##` and `hashCode`?

scala hashcode
asked 2012-01-30T17:35:43.433
17
votes
10
answers

Why equals and hashCode were defined in Object?

java oop equals hashcode
asked 2011-11-13T18:39:44.940
23
votes
6
answers

how to get hash code of a string in c++

c++ string hash hashcode
asked 2011-11-11T13:42:25.007
34
votes
4
answers

Why do 2 delegate instances return the same hashcode?

c# .net delegates hashcode
asked 2011-07-08T12:03:14.877
267
votes
15
answers

How does a Java HashMap handle different objects with the same hash code?

java hashmap hashcode hash-function
asked 2011-06-27T13:31:40.790
17
votes
2
answers

How to customize hashCode() and equals() generated by Eclipse?

java eclipse hashcode eclipse-jdt
asked 2011-06-06T16:38:54.683
9
votes
9
answers

Unit testing equals and hashcode - a complexity story

java unit-testing complexity-theory equals hashcode
asked 2011-04-23T13:18:38.263
16
votes
4
answers

HashSet contains problem with custom objects

java hashcode hashset
asked 2011-02-24T20:56:41.277
13
votes
2
answers

Is Dictionary broken or should GetHashCode() only base on immutable members?

c# .net dictionary immutability hashcode
asked 2011-02-01T22:57:27.863
129
votes
6
answers

How will Object's .equals and .hashCode will work for my classes?

java object equals hashcode equality
asked 2010-11-14T18:40:06.000
18
votes
1
answers

How can I get checkstyle to skip equals() and hashcode() methods generated by eclipse?

java eclipse equals hashcode checkstyle
asked 2010-11-11T19:11:04.993
11
votes
7
answers

How should I define a good hashCode for a circular linked list in Java?

java overriding hashcode circular-list
asked 2010-09-19T19:45:51.243
208
votes
9
answers

Why use a prime number in hashCode?

java hashcode primes
asked 2010-08-31T20:46:23.743
9
votes
1
answers

How to implement equals() and hashcode() methods in BaseEntity of JPA?

java jpa equals hashcode tostring
asked 2010-06-30T07:20:02.800
9
votes
5
answers

is it incorrect to define an hashcode of an object as the sum, multiplication, whatever, of all class variables hashcodes?

c# java .net hashcode
asked 2010-04-29T05:52:05.560
552
votes
31
answers

Why do I need to override the equals and hashCode methods in Java?

java equals hashcode
asked 2010-02-15T11:17:59.683
74
votes
10
answers

Overriding equals() & hashCode() in sub classes ... considering super fields

java inheritance overriding equals hashcode
asked 2010-01-14T19:26:43.393
13
votes
2
answers

Isn't 'int GetHashCode' a bit short-sighted?

.net hashcode
asked 2010-01-14T14:11:19.910
12
votes
3
answers

A quick string checksum function in Perl generating values in the 0..2^32-1 range

perl string checksum cpan hashcode
asked 2009-12-22T12:53:12.903
64
votes
9
answers

Understanding the workings of equals and hashCode in a HashMap

java hashmap equals hashcode
asked 2009-12-12T19:00:10.177
23
votes
1
answers

How does Object.GetHashCode work when the GC moves an object?

.net hashcode
asked 2009-11-10T12:03:06.773
118
votes
10
answers

Quick and Simple Hash Code Combinations

c# algorithm hash hashcode
asked 2009-10-29T21:53:21.353
24
votes
4
answers

ConcurrentHashMap constructor parameters?

java hashcode concurrenthashmap
asked 2009-10-15T17:30:41.087
23
votes
4
answers

Java - TreeSet and hashCode()

java hashcode treeset
asked 2009-09-24T09:55:48.047
77
votes
5
answers

How does the JVM ensure that System.identityHashCode() will never change?

java jvm hashcode heap-memory
asked 2009-06-30T10:57:42.230
150
votes
8
answers

Consistency of hashCode() on a Java string

java string hashcode
asked 2009-04-24T09:11:04.903
9
votes
9
answers

Implementing `hashCode()` for very simple classes

java hashcode
asked 2009-01-30T19:07:17.020
1037
votes
77
answers

How can I determine equality for two JavaScript objects?

javascript object equality hashcode
asked 2008-10-14T13:41:07.357
330
votes
20
answers

Best implementation for hashCode method for a collection

java hash equals hashcode
asked 2008-09-22T06:53:35.333