发现CollectionUtils的bug了
public static void main(String[] args) {Collection<String> collection = new ArrayList<String>();Collection<String> remove = new ArrayList<String>();Collection<String> retain = new ArrayList<String>();collection.add(new String("A"));collection.add(new String("B"));collection.add(new String("C"));collection.add(new String("D"));remove.add(new String("A"));remove.add(new String("B"));remove.add(new String("C"));retain.add(new String("A"));retain.add(new String("D"));retain.add(new String("E"));Collection<String> result = (Collection<String>)CollectionUtils.removeAll(collection, remove);System.out.println(result.size());for (String string : result) {System.out.print(string);System.out.print(",");}System.out.println();result = (Collection<String>)CollectionUtils.retainAll(collection, retain);System.out.println(result.size());for (String string : result) {System.out.print(string);System.out.print(",");}}输出结果：
3A,B,C,2A,D,
实际上removeAll 应该返回一个包含字符串 D 的Collection才对，这里应该是CollectionUtils的一个bug
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