java.util.Vector.indexOf() Method

Description

The indexOf(Object elem) method is used to search the first occurence of the given argument.The equality is tested by using the equals method.

Declaration

Following is the declaration for java.util.Vector.indexOf() method

public int indexOf(Object elem)

Parameters

elem − The input parameter is an object

Return Value

The return value is the index of the first occurrence of the argument in this vector.It returns -1 if the object is not found.

Exception

NA

Example

The following example shows the usage of java.util.Vector.indexOf() method.

package com.tutorialspoint;

import java.util.Vector;

public class VectorDemo {
   public static void main(String[] args) {

      // create an empty Vector vec with an initial capacity of 4      
      Vector<Integer> vec = new Vector<Integer>(4);

      // use add() method to add elements in the vector
      vec.add(4);
      vec.add(3);
      vec.add(2);
      vec.add(3);

      // let us get the index of 3
      System.out.println("Index of 3 is :"+vec.indexOf(3));
   }   
}

Let us compile and run the above program, this will produce the following result. Please note the index of first occurrence of 3 is 1 so 1 is printed instead of 3.

Index of 3 is :1

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