Getting UnsupportedOperationException

Asked Mar 16 '19 at 18:51

Active Mar 16 '19 at 21:38

Viewed 25 times

private void createObject(List<Activities> listOfActivities){
  ABC object1 = new ABC();
  String value = "";
    for (Activities list : listOfActivities) {
        if (list instanceof XYZ) {
          value= ((XYZ) list).getValue();
        }
    }
    object1.setValue(value)
    listOfActivities.add(object1);
    }
 }

In this method I am trying to add one more object, i.e. object1, but I am getting a java.lang.UnsupportedOperationException on the line listOfActivities.add(object1);.

How should I resolve this?

edited Mar 16 '19 at 21:38

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asked Mar 16 '19 at 18:51

Sangeet

2

You can only add objects of type `Activities` or subclasses thereof to a `List`. Unless `ABC` is a subclass of `Activities`, this is invalid. – RaminS Mar 16 '19 at 18:52
does class `ABC` inherit from `Activities` ? – AppleCiderGuy Mar 16 '19 at 18:53
Yes, Activities is an abstract super class and it has subclasses ABC and XYZ. XYZ object is already present in that list and I am trying to add ABC object. – Sangeet Mar 16 '19 at 18:56
@Gendarme it indeed is. Sangeet, you should refer that link. – AppleCiderGuy Mar 16 '19 at 19:15

Getting UnsupportedOperationException

0 Answers0