Java Utility Library

Java Collections - lastIndexOfSubList() Method

The java.util.Collections.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.

Syntax

public static int  lastIndexOfSubList(List<?> source, 
                                      List<?> target)

Here, T is the type of element in the collection.

Parameters

`source`	Specify the list in which to search for the last occurrence of target.
`target`	Specify the list to search for as a subList of source.

Return Value

Return 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.

Exception

NA.

Example:

In the example below, the java.util.Collections.lastIndexOfSubList() method is used to find the starting position of last occurrence of specified list in a given list.

import java.util.*;

public class MyClass {
  public static void main(String[] args) {
    //creating a list objects
    List<Integer> srclist = new ArrayList<Integer>();
    List<Integer> tgtlist = new ArrayList<Integer>();

    //populating srclist
    srclist.add(10);
    srclist.add(20);
    srclist.add(30);
    srclist.add(40);
    srclist.add(20);
    srclist.add(30);

    //populating tgtlist
    tgtlist.add(20);
    tgtlist.add(30);

    //printing the srclist
    System.out.println("srclist contains: " + srclist);  

    //finding the starting position of tgtlist in srclist
    int index = Collections.lastIndexOfSubList(srclist, tgtlist);
    System.out.println("Target list starts at: " + index); 
  }
}

The output of the above code will be:

srclist contains: [10, 20, 30, 40, 20, 30]
Target list starts at: 4

❮ Java.util - Collections