[COLLECTIONS-506] Result of CollectionUtils are different between version 3.2.1 and version 4.0

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 4.0
• Fix Version/s: 4.1
• Assignee: Unassigned
• Reporter: Anthony Communier
• Created: 22/Dec/13 19:13
• Updated: 27/Nov/15 21:11
• Resolved: 31/Dec/13 16:25

Description

CollectionUtils V3 uses equals to compute results but not CollectionUtils v4 (it seems to use ==)

The following exemple with subtract method :

List<ObjectTest> listA = new ArrayList<ObjectTest>();
List<ObjectTest> listB = new ArrayList<ObjectTest>();

listA.add(new ObjectTest("Test1"));
listA.add(new ObjectTest("Test2"));
listA.add(new ObjectTest("Test3"));

listB.add(new ObjectTest("Test1"));
listB.add(new ObjectTest("Test2"));

Collection<?> res1 = org.apache.commons.collections.CollectionUtils.subtract(listA, listB);
System.out.println("Res1 size = " +res1.size());
Collection<?> res2 = org.apache.commons.collections4.CollectionUtils.subtract(listA, listB);
System.out.println("Res2 size = " +res2.size());

Produces this :
Res1 size = 1
Res2 size = 3

The new behaviour is not useful. It would be better to have the V3 behaviour