AbstractSequentialList lastIndexOf() method in Java with Example Last Updated : 24 Dec, 2018 Comments Improve Suggest changes Like Article Like Report The lastIndexOf() method of java.util.AbstractSequentialList class is used to return the index of the first occurrence of the specified element in this list, or -1 if this list does not contain the element. More formally, returns the lowest index i such that (o==null ? get(i)==null : o.equals(get(i))), or -1 if there is no such index. Syntax: public int lastIndexOf(Object o) Parameters: This method takes Object o as parameter which is the element to search for. Return Value: This method returns the index of the first occurrence of the specified element in this list, or -1 if this list does not contain the element. Exception: This method throws: ClassCastException: if the type of the specified element is incompatible with this list. NullPointerException: if the specified element is null and this list does not permit null elements. Below are the examples to illustrate the lastIndexOf() method. Example 1: Java // Java program to demonstrate lastIndexOf() // method for AbstractSequentialList import java.util.*; public class GFG { public static void main(String[] args) { // Creating object of AbstractSequentialList AbstractSequentialList<Integer> arrlist1 = new LinkedList<Integer>(); // Populating arrlist1 arrlist1.add(10); arrlist1.add(20); arrlist1.add(30); arrlist1.add(40); arrlist1.add(50); // print arrlist1 System.out.println("AbstractSequentialList: " + arrlist1); // getting the index of element 30 // using lastIndexOf() method int index = arrlist1.lastIndexOf(30); // print the index System.out.println("Last Index of 30: " + index); } } Output: AbstractSequentialList: [10, 20, 30, 40, 50] Last Index of 30: 2 Example 2: Java // Java program to demonstrate lastIndexOf() // method for AbstractSequentialList import java.util.*; public class GFG1 { public static void main(String[] args) { // Creating object of AbstractSequentialList AbstractSequentialList<Integer> arrlist1 = new LinkedList<Integer>(); // Populating arrlist1 arrlist1.add(10); arrlist1.add(20); arrlist1.add(30); arrlist1.add(40); arrlist1.add(50); // print arrlist1 System.out.println("LinkedListlist: " + arrlist1); // getting the index of element 100 // using lastIndexOf() method int index = arrlist1.lastIndexOf(100); // print the index System.out.println("Last Index of 100: " + index); } } Output: LinkedListlist: [10, 20, 30, 40, 50] Last Index of 100: -1 Comment More infoAdvertise with us Next Article AbstractSequentialList hashCode() method in Java with Example C code_r Follow Improve Article Tags : Java Java-Collections Java - util package Java-Functions java-AbstractSequentialList +1 More Practice Tags : JavaJava-Collections Similar Reads AbstractSequentialList in Java with Examples The AbstractSequentialList class in Java is a part of the Java Collection Framework and implements the Collection interface and the AbstractCollection class. 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