Java Collections indexOfSubList() Method

The indexOfSubList() method of Java Collections class is used to get the starting position of the first 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 indexOfSubList() method:

Parameter

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

Returns

The indexOfSubList() method returns the starting position of the first 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 CollectionsIndexOfSubListExample1 {
	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.indexOfSubList(srclist, targetlist);
	      System.out.println("Target list starts at index: "+index); 
	      }	  
}

Test it Now

Output:

Target list starts at index: 2

Example 2

import java.util.*;
public class CollectionsIndexOfSubListExample2 {
	public static void main(String[] args) {
	      //Create lists for source and destination    
	      List<Integer> source = Arrays.asList(3,4,5);
	      List<Integer> target = Arrays.asList(1,2,3,4,5,6,7,8);
	      //Check target list in source list
	      int index = Collections.indexOfSubList(target, source);
		System.out.println("Target list starts at index: "+index);	    
	      }	  
}	

Test it Now

Output:

Target list starts at index: 2

Example 3

import java.util.*;
public class CollectionsIndexOfSubListExample3 {
	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.indexOfSubList(l1, sublist);                                                                  
          //Printing IndexOfSublist
          System.out.println("IndexOfSubList: " +Index);                                                           
	    }	  
}

Test it Now

Output:

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

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Java Collections indexOfSubList() Method

Syntax

Parameter

Returns

Exceptions

Compatibility Version

Example 1

Example 2

Example 3