Java ListIterator previousIndex() Method

The previousIndex() method of ListIterator interface is used to return the index of the given element which is returned by a call to previous. The method may return -1 if and only if the iterator is placed at the beginning of the list.

Syntax

Parameters

Return

The above method is used to return the index of the given element which is returned by a call to previous. The method may return -1 if and only if the iterator is placed at the beginning of the list.

Example 1

import java.util.ArrayList;
import java.util.ArrayList;
import java.util.ListIterator;
public class JavaListIteratorpreviousIndexExample1 {
   public static void main(String[] args) {
	   ArrayList < Character > characters = new ArrayList < Character > ();
   	characters.add('R');
   	characters.add('E');
   	characters.add('A');
   	characters.add('L');
ListIterator < Character > listIterator = characters.listIterator();
System.out.println("The letters are listed as : "+characters);
       System.out.println("The Previous Index is : " + listIterator.previousIndex());
       listIterator.next();   
       System.out.println("The Previous Index is : " + listIterator.previousIndex());
       listIterator.next();
       System.out.println("The Next Index is : " + listIterator.previousIndex());
       listIterator.next();
       System.out.println("The Next index is : " + listIterator.previousIndex());     
   }
}

Test it Now

Output:

The letters are listed as : [R, E, A, L]
The Previous Index is : -1
The Previous Index is : 0
The Next Index is : 1
The Next index is : 2

Example 2

import java.util.ArrayList;
import java.util.ListIterator;
public class JavaListIteratorpreviousIndexExample2 {
  public static void main(String[] args) {
	  ArrayList < Long > number = new ArrayList < Long > ();
          number.add(34l);
          number.add(78l);
          number.add(57l);
	ListIterator < Long > listIterator = number.listIterator();
	System.out.println("The numbers are listed as : "+number);
	       System.out.println("The Previous Index is : " + listIterator.previousIndex());
	       listIterator.next();   
	       System.out.println("The Previous Index is : " + listIterator.previousIndex());
	       listIterator.next();
	       System.out.println("The Next Index is : " + listIterator.previousIndex());
  }
}

Test it Now

Output:

The numbers are listed as : [34, 78, 57]
The Previous Index is : -1
The Previous Index is : 0
The Next Index is : 1

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Java ListIterator Class