| public int hashCode() Overrides java.lang.Object.hashCode.
Doc from java.lang.Object.hashCode.
Returns a hash code value for this object. This method is
supported for the benefit of hash tables such as those provided by
java.util.HashMap.
The general contract of hashCode is:
- Whenever it is invoked on the same object more than once during
an execution of a Java application, the
hashCode method
must consistently return the same integer, provided no information
used in equals comparisons on the object is modified.
This integer need not remain consistent from one execution of an
application to another execution of the same application.
- If two objects are equal according to the
equals method, then calling the hashCode method on each of the two objects must produce the
same integer result.
- It is not required that if two objects are unequal
according to the
equals method, then
calling the hashCode method on each of the two objects
must produce distinct integer results. However, the programmer
should be aware that producing distinct integer results for
unequal objects may improve the performance of hash tables.
|