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")); }} |
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)); }} |
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).
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