List listIterator() Method in Java with Examples
This method returns a list iterator over the elements in the mentioned list (in proper sequence), starting at the specified position in the list.
Syntax:
ListIterator listIterator(int index)
Parameters: This method has only argument, i.e, index – index of the first element to be returned from the list iterator (by a call to next).
Returns: This method returns a list iterator over the elements in this list (in proper sequence), starting at the specified position in the list.
Exception: This method throws an exception IndexOutOfBoundsException – if the index is out of range (index size())
Below programs show the implementation of this method.
Program 1:
// Java program to demonstrate// listIterator() method// for List interfaceimport java.util.*; public class GFG1 { public static void main(String[] argv) throws Exception { try { // Creating object of List<Integer> List<Integer> arrlist = new ArrayList<>(); // adding element to arrlist arrlist.add(1); arrlist.add(3); arrlist.add(6); arrlist.add(9); // print arrlist System.out.println("ArrayList: " + arrlist); // Creating object of ListIterator<String> // using listIterator() method ListIterator<Integer> iterator = arrlist.listIterator(); // Printing the iterated value System.out.println("\nUsing ListIterator:\n"); while (iterator.hasNext()) { System.out.println("Value is : " + iterator.next()); } } catch (NullPointerException e) { System.out.println("Exception thrown : " + e); } }} |
Output:
ArrayList: [1, 3, 6, 9] Using ListIterator: Value is : 1 Value is : 3 Value is : 6 Value is : 9
Program 2: Below is the code to show implementation of list.subList() using Linkedlist.
// Java program to demonstrate// listIterator() method// for List interfaceimport java.util.*; public class GFG1 { public static void main(String[] argv) throws Exception { try { // Creating object of List<Integer> List<String> arrlist = new ArrayList<String>(); // adding element to arrlist arrlist.add("A"); arrlist.add("B"); arrlist.add("C"); arrlist.add("D"); // print arrlist System.out.println("ArrayList: " + arrlist); // Creating object of ListIterator<String> // using listIterator() method ListIterator<String> iterator = arrlist.listIterator(); // Printing the iterated value System.out.println("\nUsing ListIterator:\n"); while (iterator.hasNext()) { System.out.println("Value is : " + iterator.next()); } } catch (NullPointerException e) { System.out.println("Exception thrown : " + e); } }} |
Output:
ArrayList: [A, B, C, D] Using ListIterator: Value is : A Value is : B Value is : C Value is : D
Reference:
Oracle Docs
