How do I create a read-only collection?

Created May 4, 2012

John Zukowski

The Collections class has six methods to help out here:

unmodifiableCollection(Collection c)
unmodifiableList(List list)
unmodifiableMap(Map m)
unmodifiableSet(Set s)
unmodifiableSortedMap(SortedMap m)
unmodifiableSortedSet(SortedSet s)

If you then get an Iterator from one of these unmodifiable collections, when you call remove() it will throw an UnsupportedOperationException.

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