Java Tutorial/Collections/Wrapped Collections
Read-Only Collections
<source lang="java">
public static Collection unmodifiableCollection(Collection c) public static List unmodifiableList(List l) public static Map unmodifiableMap(Map m) public static Set unmodifiableSet(Set s) public static SortedMap unmodifiableSortedMap(SortedMap m) public static SortedSet unmodifiableSortedSet(SortedSet s)</source>
Exception in thread "main" java.lang.UnsupportedOperationException at java.util.Collections$UnmodifiableCollection.clear(Collections.java:1037) at MainClass.main(MainClass.java:20)