Question

While studying the Collection API, we find that some methods (add, remove,…) may throw a java.lang.UnsupportedOperationException if the current implementation of the Collection does not support those functionalities.

Is there,actually, in the JDK, a concrete Collection that does not support those methods ?

Thanks a lot for your answers.

Answer 1

The obvious examples are the implementations returned from, say, Collections.unmodifiableCollection() and other similar methods. Methods that would change the Collection throw this exception.