Properly removing an Integer from a List

Question

Here\'s a nice pitfall I just encountered. Consider a list of integers:

List list = new ArrayList();
list.add(5);
list.add(6);         


        

Answer 1

Note that even if the VM did not do the right thing, which it does, you could still ensure proper behaviour by using the fact that remove(java.lang.Object) operates on arbitrary objects:

myList.remove(new Object() {
  @Override
  public boolean equals(Object other) {
    int k = ((Integer) other).intValue();
    return k == 1;
  }
}