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Java - Collection Framework - Collections [UnModifiableList] |
import java.util.ArrayList;
import java.util.Collections; import java.util.List; /* Example of: unmodifiableList(List<? extends T> list) method Parameters: list - the list for which an unmodifiable view is to be returned. Returns: an unmodifiable view of the specified list. */ public class CollectionsExample { public static void main(String[] args) { ArrayList<Integer> arrayList = new ArrayList<Integer>(); arrayList.add(2000); arrayList.add(3000); arrayList.add(4000); arrayList.add(1000); System.out.println("arrayList : " + arrayList + "\n"); /* * Returns an unmodifiable view of the specified list. * * This method allows modules to provide users with "read-only" access to internal * lists. * * Query operations on the returned list "read through" to the * specified list, and attempts to modify the returned list, whether * direct or via its iterator, result in an * UnsupportedOperationException. */ List<Integer> unmodifiableList = Collections.unmodifiableList(arrayList); System.out.println("unmodifiableList : " + unmodifiableList+"\n"); /* * We cannot modify the unmodifiableList. */ unmodifiableList.add(200); } }
arrayList : [2000, 3000, 4000, 1000] unmodifiableList : [2000, 3000, 4000, 1000] Exception in thread "main" java.lang.UnsupportedOperationException at java.util.Collections$UnmodifiableCollection.add(Collections.java:1055) at CollectionsExample.main(CollectionsExample.java:53)
https://sites.google.com/site/javaee4321/java-collections/CollectionsDemo-unmodifiableList.zip?attredirects=0&d=1
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