The listIterator() method of CopyOnWriteArrayList returns an listIterator over the elements in this list in proper sequence. The listIterator does NOT support the remove, set or add methods.
Syntax:
public ListIterator listIterator()
Parameters: The function does not accept any parameters.
Return Value: The function returns a list iterator over the elements in this list (in proper sequence)
Below programs illustrate the above function:
Program 1:
Java
// Java Program to illustrate the CopyOnWriteArrayList// listIterator() 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 listIterator() method of Iterator iteratorVals = ArrLis.listIterator(); // 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()); } }} |
CopyOnWriteArrayList: [32, 67, 67, 100] The iterator values of CopyOnWriteArrayList are: 32 67 67 100
The listIterator(index) method of CopyOnWriteArrayList returns an listIterator over the elements in this list in proper sequence starting from a particular index. The listIterator does NOT support the remove, set or add methods.
Syntax:
public ListIterator listIterator(int index)
Parameters: The function accepts a parameter index which specifies the index of the first element to be returned from the list iterator.
Return Value: The function returns a list iterator over the elements in this list starting from the specified index (in proper sequence).
Exceptions: The function throws IndexOutOfBoundsException if the index is out of range.
Below programs illustrate the above function:
Program 1:
Java
// Java Program to illustrate the CopyOnWriteArrayList// listIterator() 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 listIterator() method from 2nd index Iterator iteratorVals = ArrLis.listIterator(2); // 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()); } }} |
CopyOnWriteArrayList: [gopal, gfg, jgec, sudo] The iterator values of CopyOnWriteArrayList are: jgec sudo
Program 2:
Java
// Java Program to illustrate the CopyOnWriteArrayList// listIterator() method in Java, exceptionimport 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 listIterator() method from 6th index // hence exception is returned Iterator iteratorVals = ArrLis.listIterator(6); // 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:
Exception in thread "main" java.lang.IndexOutOfBoundsException: Index: 6
at java.util.concurrent.CopyOnWriteArrayList.listIterator(CopyOnWriteArrayList.java:1107)
at GFG.main(GFG.java:25)
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