Field Detail

• JAVA_HASHER

  static final HashingStrategy JAVA_HASHER

  A HashingStrategy which delegates to java's Object.hashCode() and Object.equals(Object).

Method Detail

• hashCode

  int hashCode​(T obj)

  Generate a hash code for obj.

  This method must obey the same relationship that Object.hashCode() has with Object.equals(Object):

  • Calling this method multiple times with the same obj should return the same result
  • If equals(Object, Object) with parameters a and b returns true then the return value for this method for parameters a and b must return the same result
  • If equals(Object, Object) with parameters a and b returns false then the return value for this method for parameters a and b does not have to return different results results. However this property is desirable.
  • if obj is null then this method return 0

• equals

  boolean equals​(T a,
                 T b)

  Returns true if the arguments are equal to each other and false otherwise. This method has the following restrictions:

  • reflexive - equals(a, a) should return true
  • symmetric - equals(a, b) returns true if equals(b, a) returns true
  • transitive - if equals(a, b) returns true and equals(a, c) returns true then equals(b, c) should also return true
  • consistent - equals(a, b) should return the same result when called multiple times assuming a and b remain unchanged relative to the comparison criteria
  • if a and b are both null then this method returns true
  • if a is null and b is non-null, or a is non-null and b is null then this method returns false