Let’s understand iterator pattern with a simple example. Suppose we have a list of Radio channels and the client program want to traverse through them one by one or based on the type of channel. For example some client programs are only interested in English channels and want to process on...
In Java, ListIterator is an interface in Collection API. It extends Iterator interface. To support Forward and Backward Direction iteration and CRUD operations, it has the following methods. We can use this Iterator for all List implemented classes like ArrayList, CopyOnWriteArrayList, LinkedList, Sta...
Exception in thread"main"java.util.ConcurrentModificationException at java.util.ArrayList$Itr.checkForComodification(ArrayList.java:901) at java.util.ArrayList$Itr.next(ArrayList.java:851) at com.howtodoinjava.example.ArrayListExample.main(ArrayListExample.java:22) 5. Differences betweenIteratorandListIt...
value2 Exception in thread "main" java.util.ConcurrentModificationException at java.util.ArrayList$Itr.checkForComodification(ArrayList.java:909) at java.util.ArrayList$Itr.next(ArrayList.java:859) at com.example.andya.demo.DemoApplication.main(DemoApplication.java:30) Process finished with exit code...
1. JavaListIteratorExample To obtain the reference ofListIterator, we use thelistIterator()method on theListobject. ListIteratoriterator=list.listIterator(); In the following example, we have a list containing four strings. We are iterating first in the forward direction and then in the backwar...
Exception in thread"main"java.util.ConcurrentModificationException at java.util.ArrayList$Itr.checkForComodification(ArrayList.java:909) at java.util.ArrayList$Itr.next(ArrayList.java:859) at com.example.andya.demo.DemoApplication.main(DemoApplication.java:30) ...
value2Exceptionin thread"main"java.util.ConcurrentModificationExceptionat java.util.ArrayList$Itr.checkForComodification(ArrayList.java:909)at java.util.ArrayList$Itr.next(ArrayList.java:859)at com.example.andya.demo.DemoApplication.main(DemoApplication.java:30)Processfinishedwithexit code1 ...
importjava.util.ArrayList;importjava.util.Iterator;publicclassConditionalIteratorExample{publicstaticvoidmain(String[]args){ArrayList<Integer>numbers=newArrayList<>();numbers.add(1);numbers.add(2);numbers.add(3);numbers.add(4);numbers.add(5);Iterator<Integer>iterator=numbers.iterator();System.out.pri...
The collections which are there from Java 1.2 (or even legacy) like ArrayList, Vector, HashSet, LinkedHashSet, TreeSet, HashMap all havefail-fast iteratorwhereas Concurrent collections added in Java 1.5 like ConcurrrentHashMap, CopyOnWriteArrayList, CopyOnWriteArraySet havefail-safe iterator. The iter...
Example Use an iterator to remove numbers less than 10 from a collection: import java.util.ArrayList; import java.util.Iterator; public class Main { public static void main(String[] args) { ArrayList<Integer> numbers = new ArrayList<Integer>(); numbers.add(12); numbers.add(8); numbers....