java.util.Vector.indexOf() Method

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Description

This is another variant of previous indexOf() method.The only difference is that the search for the first occurence of the given argument starts at the index position mentioned as the second parameter.

Declaration

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

public int indexOf(Object elem,int index)

Parameters

• elem − The input parameter is an object

• index − This is the non-negative index to start searching from

Return Value

The method call returns the index of the first occurrence of the object argument in this vector at position index or later in the vector.

Exception

IndexOutOfBoundsException − This exception is thrown if the index is negative

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);
      vec.add(2);
      vec.add(3);

      /** let us get the index of 3
      * starting search from 2nd index
      */
      System.out.println("Index of 3 :"+vec.indexOf(3,2));
   }    
}

Let us compile and run the above program, this will produce the following result.

Index of 3 :3