Java Vector lastIndexOf() Method with Example

Vector Class lastIndexOf() method: Here, we are going to learn about the lastIndexOf() method of Vector Class with its syntax and example.
Submitted by Preeti Jain, on March 19, 2020

Vector Class lastIndexOf() method

Syntax:

    public int lastIndexOf (Object ob);
    public int lastIndexOf (Object ob, int indices);

lastIndexOf() method is available in java.util package.
lastIndexOf(Object ob) method is used to return the index of the last occurrence of the given element.
lastIndexOf(Object ob, int indices) method is used to find the index of the last occurrence of the given object in this Vector and searching starts at the given indices.
These methods may throw an exception at the time of returning an index.
IndexOutOfBoundsException: This exception may throw when the given parameter is not in a range.
These are non-static methods and it is accessible with class objects and if we try to access these methods with the class name then we will get an error.

Parameter(s):

In the first case, lastIndexOf(Object ob)
- Object ob – represents the object for which the last occurrence element index to be returned.
In the first case, lastIndexOf (Object ob, int indices)
- Object ob – represents the object for which the last occurrence element index to be returned.
- int indices – represents the index of searching starts.

Return value:

In both the cases, the return type of the method is int - it gets the index of the last occurrence of the given object when exists otherwise it returns -1.

Example:

// Java program to demonstrate the example 
// of lastIndexOf() method of Vector

import java.util.*;

public class LastIndexOfVector {
 public static void main(String[] args) {
  // Instantiates a vector object     
  Vector < String > v = new Vector < String > (10);

  // By using add() method is to add
  // the elements in vector
  v.add("C");
  v.add("C++");
  v.add("SFDC");
  v.add("C++");
  v.add("JAVA");

  //Display Vector
  System.out.println("v: " + v);

  // By using lastIndexOf(object) method is used
  // to return the index of last occurrence of the
  // given object
  System.out.println("v.lastIndexOf(C++): " + v.lastIndexOf("C++"));

  // By using lastIndexOf(object, indices) method is used
  // to return the index of last occurrence of the
  // given object and searching starts from the 
  // given indices
  System.out.println("v.lastIndexOf(C++,4): " + v.lastIndexOf("C++", 4));
 }
}

Output

v: [C, C++, SFDC, C++, JAVA]
v.lastIndexOf(C++): 3
v.lastIndexOf(C++,4): 3

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