Java Collections lastIndexOfSubList() Method

The lastIndexOfSubList() method of Java Collections class is used to get the starting position of the last occurrence of the specified target list within the specified source list. It returns -1 if there is no such occurrence in the specified list.

Syntax

Following is the declaration of lastIndexOfSubList() method:

Parameter

Parameter	Description	Required/Optional
source	It is the list in which we search for the last occurrence of target.	Required
target	It is the list to search for as a subList of source.	Required

Returns

The lastIndexOfSubList() method returns the starting position of the last occurrence of the specified target list within the specified source list, or -1 if there is no such occurrence.

Exceptions

Compatibility Version

Java 1.4 and above

Example 1

import java.util.*;
public class CollectionsLastIndexOfSubListExample1 {
	public static void main(String[] args) {
		//Create Source array list objects       
	      List<String> srclist = new ArrayList<>();
	      //Add elements in the list
	      srclist.add("A");
	      srclist.add("B");
	      srclist.add("C");
	      srclist.add("D");
	      srclist.add("E"); 
	      //Create Target array list objects 
	      List<String> targetlist = new ArrayList<>();
	      //Add elements in the list
	      targetlist.add("C");
	      targetlist.add("D");
	      targetlist.add("E");
	      //Check target list in source list
	      int index = Collections.lastIndexOfSubList(srclist, targetlist);
	      System.out.println("Target Output: "+index); 
	      }	  
}

Test it Now

Output:

Target Output: 2

Example 2

import java.util.*;
public class CollectionsLastIndexOfSubListExample2 {
	public static void main(String[] args) {
	      //Create lists for source and destination    
	      List<Integer> source = Arrays.asList(1,2,3);
	      List<Integer> target = Arrays.asList(4,5,6,7,8);
	      //Check target list in source list
	      int index = Collections.lastIndexOfSubList(target, source);
		System.out.println("Target Output: "+index);	    
	      }	  
}

Test it Now

Output:

Target Output: -1

Example 3

import java.util.*;
public class CollectionsLastIndexOfSubListExample3 {
	public static void main(String[] args) {
	   //Creating array list with values
	   List<String> l1 = Arrays.asList("kitu mani raj karthi rahul gagan".split(" ")); 
	  //Printing array list
        System.out.println("List :" + l1);
        //Sublist which we need IndexOf
        List<String> sublist = Arrays.asList("karthi rahul".split(" "));                                                       
        Integer Index = Collections.lastIndexOfSubList(l1, sublist);                                                                  
        //Printing Last IndexOfSublist
        System.out.println("Last IndexOfSubList: " +Index);                                                           
	  }	  
}

Test it Now

Output:

List :[kitu, mani, raj, karthi, rahul, gagan]
Last IndexOfSubList: 3

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Java Collections lastIndexOfSubList() Method

Syntax

Parameter

Returns

Exceptions

Compatibility Version

Example 1

Example 2

Example 3