ArrayList - making list unmodifiable using Collections.unmodifiableList

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ArrayList - making list unmodifiable using Collections.unmodifiableList

import java.util.ArrayList; import java.util.Collections; import java.util.List; /** * Copyright (c), AnkitMittal JavaMadeSoEasy.com */ public class ArrayListTest {    public static void main(String args[]) {           // creates array with initial capacity of 10.           List<String> arrayList = new ArrayList<String>();           arrayList.add("ankit");           arrayList.add("javaMadeSoEasy");           // getting unmodifiable list           List<String> unmodifiableList = Collections.unmodifiableList(arrayList);                     /*           * Now any attempt to modify list will throw java.lang.UnsupportedOperationException           */           unmodifiableList.add("mittal");    } } /*OUTPUT Exception in thread "main" java.lang.UnsupportedOperationException    at java.util.Collections$UnmodifiableCollection.add(Unknown Source)    at arrayListUnModifiable.ArrayListTest.main(ArrayListTest.java:24) */

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