How avoid ConcurrentModificationException while iterating collection
Answer : For explanation please refer this. Please have java program to avoid CCM exception:
package com.javahonk.iteratorenumeration; import java.util.ArrayList; import java.util.Iterator; import java.util.List; public class AvoidCCMException { public static void main(String[] args) { List<String> arrayList = new ArrayList<String>(); arrayList.add("Java"); arrayList.add("Honk"); arrayList.add("CCMTest"); //avoid concurrent modification exception Iterator<String> iterator = arrayList.iterator(); while (iterator.hasNext()) { String string = (String) iterator.next(); System.out.println(string); if (string.equalsIgnoreCase("Honk")) { iterator.remove(); } } System.out.println("\nbelow code will throw exception"); //throw concurrent modification exception iterator = arrayList.iterator(); arrayList.remove(0); while (iterator.hasNext()) { String string = (String) iterator.next(); System.out.println(string); } } }
Output: