CopyOnWriteArrayList iterator() method in Java
The iterator() method of CopyOnWriteArrayList returns an iterator over the elements in this list in proper sequence. The iterator does NOT support the remove method.
Syntax:
public Iterator iterator()
Parameters: The function does not accept any parameters.
Return Value: The function returns an iterator over the elements in the list.
Below programs illustrate the above function:
Program 1:
// Java Program to illustrate the CopyOnWriteArrayList// iterator() method in Javaimport java.util.concurrent.CopyOnWriteArrayList;import java.util.*;  public class GFG {    public static void main(String[] args)    {          // create object of CopyOnWriteArrayList        CopyOnWriteArrayList<Integer> ArrLis            = new CopyOnWriteArrayList<Integer>();          // Add elements        ArrLis.add(32);        ArrLis.add(67);        ArrLis.add(67);        ArrLis.add(100);          // print CopyOnWriteArrayList        System.out.println("CopyOnWriteArrayList: " + ArrLis);          // Call iterator() method of        Iterator iteratorVals = ArrLis.iterator();          // Print elements of iterator        // created from CopyOnWriteArrayList        System.out.println("The iterator values"                           + " of CopyOnWriteArrayList are:");          // prints the elements using an iterator        while (iteratorVals.hasNext()) {            System.out.println(iteratorVals.next());        }    }} |
Output:
CopyOnWriteArrayList: [32, 67, 67, 100] The iterator values of CopyOnWriteArrayList are: 32 67 67 100
Program 2:
// Java Program to illustrate the CopyOnWriteArrayList// iterator() method in Javaimport java.util.concurrent.CopyOnWriteArrayList;import java.util.*;  public class GFG {    public static void main(String[] args)    {          // create object of CopyOnWriteArrayList        CopyOnWriteArrayList<String> ArrLis            = new CopyOnWriteArrayList<String>();          // Add elements        ArrLis.add("gopal");        ArrLis.add("gfg");        ArrLis.add("jgec");        ArrLis.add("sudo");          // print CopyOnWriteArrayList        System.out.println("CopyOnWriteArrayList: " + ArrLis);          // Call iterator() method of        Iterator iteratorVals = ArrLis.iterator();          // Print elements of iterator        // created from CopyOnWriteArrayList        System.out.println("The iterator values"                           + " of CopyOnWriteArrayList are:");          // prints the elements using an iterator        while (iteratorVals.hasNext()) {            System.out.println(iteratorVals.next());        }    }} |
Output:
CopyOnWriteArrayList: [gopal, gfg, jgec, sudo] The iterator values of CopyOnWriteArrayList are: gopal gfg jgec sudo
Reference: https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/CopyOnWriteArrayList.html#iterator–
