What is the Vector.listIterator method in Java?

The Vector class is a growable array of objects. The elements of Vector can be accessed using an integer index, and the size of a Vector can be increased or decreased. Read more about the Vector here.

The listIterator method of the Vector class will return a ListIterator over the elements in this vector. The returned ListIterator contains the elements in proper sequence.

The ListIterator is an iterator which we can use to traverse the list in both directions (forwards and backwards), modify the list, and get the index of the current position of the iterator. Also, it doesn’t have the currentElement like Iterator. Read more about the ListIterator here.

Syntax

public ListIterator<E> listIterator()

Parameters

This method doesn’t take any arguments.

Return value

This method returns a ListIterator object with the elements of the Vector object.

Code

The below code demonstrates how to use the listIterator method.

import java.util.Vector;
import java.util.ListIterator;
class Capacity {
    public static void main( String args[] ) {
        Vector<Integer> vector = new Vector<>();  
        vector.add(1);
        vector.add(2);
        vector.add(3);
        vector.add(4);
        ListIterator<Integer> listIterator = vector.listIterator();
        System.out.println("The elements of the vector is ");
        while(listIterator.hasNext()) {
          System.out.print(listIterator.next() + " , ");
        }
    }
}

Explanation

In the above code:

  • In lines 1 and 2: We imported the Vector and ListIterator classes.

  • In line 5: We created a new Vector object with the name vector.

  • From lines 6-9: We added four elements(1,2,3,4) to the vector object using the add method.

  • In line 10: We used the listIterator method to get a ListIterator for the elements of the vector.

  • In line 13: We printed the elements of the ListIterator using the while loop. We used the hasNext method of the iterator object to check if the ListIterator contains more elements. We also used the next method to get the element at the next cursor position.

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