Vector lastIndexOf() Method in Java

Last Updated : 24 May, 2023

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).

Vector lastIndexOf() Method in Java

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