Java Collections indexOfSubList() Method with Examples

by Online Tutorials Library July 22, 2022

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 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 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 source = Arrays.asList(3,4,5);        List 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 l1 = Arrays.asList(“kitu mani raj karthi rahul gagan”.split(” “));       //Printing array list            System.out.println(“List :” + l1);            //Sublist which we need IndexOf            List 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 with Examples

Java Collections indexOfSubList() Method

Syntax

Parameter

Returns

Exceptions

Compatibility Version

Example 1

Example 2

Example 3

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