Vector lastIndexOf() Method in Java Last Updated : 24 May, 2023 Comments Improve Suggest changes Like Article Like Report The Java.util.Vector.lastIndexOf(Object element) method is used to check and find the occurrence of a particular element in the vector. If the element is present in the vector then the lastIndexOf() method returns the index of last occurrence of the element otherwise it returns -1. This method is used to find the last occurrence of a particular element in a vector. Syntax: Vector.lastIndexOf(Object element) Parameters: The parameter element is of type Vector. It refers to the element whose last occurrence is required to be checked. Return Value: The method returns the position of the last occurrence of the element in the Vector. If the element is not present in the Vector then the method returns -1. The returned value is of integer type. Below programs illustrate the Java.util.Vector.lastIndexOf() method: Program 1: Java // Java code to illustrate lastIndexOf() import java.util.*; public class VectorDemo { public static void main(String args[]) { // Creating an empty Vector Vector<String> vec_tor = new Vector<String>(); // Use add() method to add elements in the Vector vec_tor.add("Geeks"); vec_tor.add("for"); vec_tor.add("Geeks"); vec_tor.add("10"); vec_tor.add("20"); // Displaying the Vector System.out.println("Vector: " + vec_tor); // The last position of an element is returned System.out.println("Last occurrence of Geeks is at index: " + vec_tor.lastIndexOf("Geeks")); System.out.println("Last occurrence of 10 is at index: " + vec_tor.lastIndexOf("10")); } } Output:Vector: [Geeks, for, Geeks, 10, 20] Last occurrence of Geeks is at index: 2 Last occurrence of 10 is at index: 3 Program 2: Java // Java code to illustrate lastIndexOf() import java.util.*; public class VectorDemo { public static void main(String args[]) { // Creating an empty Vector Vector<Integer> vec_tor = new Vector<Integer>(); // Use add() method to add elements in the Vector vec_tor.add(10); vec_tor.add(22); vec_tor.add(3); vec_tor.add(10); vec_tor.add(20); // Displaying the Vector System.out.println("Vector: " + vec_tor); // The last position of an element is returned System.out.println("Last occurrence of 10 is at index: " + vec_tor.lastIndexOf(10)); System.out.println("Last occurrence of 20 is at index: " + vec_tor.lastIndexOf(20)); } } Output:Vector: [10, 22, 3, 10, 20] Last occurrence of 10 is at index: 3 Last occurrence of 20 is at index: 4 Time complexity: O(n). // n is the size of the vector.Auxiliary Space: O(n). Comment More infoAdvertise with us Next Article Vector lastIndexOf() Method in Java K kundankumarjha Follow Improve Article Tags : Misc Java Java-Collections Java - util package Java-Functions Java-Vector +2 More Practice Tags : JavaJava-CollectionsMisc Similar Reads Java Vector copyInto() Method In Java, the copyInto() method is used to copy all the components from one vector to another array, having enough space to hold all of the components of the vector. It is to be noted that the index of the elements remains unchanged. The elements present in the array are replaced by the elements of t 3 min read Java Vector elementAt() Method In Java, the elementAt() method is used to fetch or retrieve an element at a specific index from a Vector. 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