JDK-6273662 : At several places the way hashcode is built is either over or under specified
  • Type: Bug
  • Component: core-svc
  • Sub-Component: javax.management
  • Affected Version: 6
  • Priority: P3
  • Status: Closed
  • Resolution: Fixed
  • OS: generic
  • CPU: generic
  • Submitted: 2005-05-20
  • Updated: 2017-05-16
  • Resolved: 2005-07-22
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JDK 6
6 b45Fixed
Related Reports
Relates :  
JDK-6369229 - For several methods, the javadoc body comes from the ancestor in place of from the interface
Description
The javadoc of openmbean.ArrayType.hashCode and openmbean.CompositeDataSupport.hashCode (and possibly other classes) describes how the hashCode is computed by doing the sum of various elements. It appears some of these elements are primitive types (int & boolean) and the javadoc does not explain how the hashcode is computed for them.
There is a need for clarification.
###@###.### 2005-05-20 13:41:40 GMT
Comments
SUGGESTED FIX Specify that the hashCode for a primitive value is the hashCode of the corresponding boxed object. So for example the hashCode for "true" is Boolean.TRUE.hashCode(). ###@###.### 2005-05-20 14:34:07 GMT
20-05-2005
EVALUATION Detailing exactly how the hashCode is computed makes sense for interfaces (like CompositeData) and for classes that implement such interfaces, but is not particularly useful for other classes (like ArrayType). However, it's there, and code could depend on it, so we can't change it. Therefore we must complete the specification by saying explicitly how the hashCode is computed when primitive values enter into the calculation. ###@###.### 2005-05-20 14:34:07 GMT
20-05-2005