Vector : indexOf(Object o, int index)

public synchronized int indexOf(Object o, int index)

Returns the index of the first occurrence of the specified element in this vector, searching forwards from index, or returns -1 if the element is not found.

import java.util.*;

class VectorIndexOf1{
 public static void main(String args[]){
  Vector<Integer> myVector;
  myVector = new Vector<> ();
  
  /*Add Elements to myVector*/
  myVector.add(10);
  myVector.add(11);
  myVector.add(12);
  myVector.add(10);
  myVector.add(12);
  
  System.out.println("Elements in myVector");
  System.out.println(myVector); 
  
  System.out.print("\nIndex of 12 is ");
  System.out.println(myVector.indexOf(12,2));
  System.out.print("\nIndex of 10 is ");
  System.out.println(myVector.indexOf(10,1));
  System.out.print("\nIndex of 11 is ");
  System.out.println(myVector.indexOf(11,2));
 }
}

Output

Elements in myVector
[10, 11, 12, 10, 12]

Index of 12 is 2

Index of 10 is 3

Index of 11 is -1

1. Throws IndexOutOfBoundsException if the specified index is negative

import java.util.*;

class VectorIndexOfIndexOut{
 public static void main(String args[]){
  Vector<Integer> myVector;
  myVector = new Vector<> ();
  
  /*Add Elements to myVector*/
  myVector.add(10);
  myVector.add(11);
  myVector.add(12);
  myVector.add(10);
  myVector.add(12);
  
  System.out.println("Elements in myVector");
  System.out.println(myVector); 
  
  System.out.print("\nIndex of 12 is ");
  System.out.println(myVector.indexOf(12,-1));
 }
}

Output

Elements in myVector
[10, 11, 12, 10, 12]

Index of 12 is Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: -1
        at java.util.Vector.indexOf(Vector.java:404)
        at VectorIndexOfIndexOut.main(VectorIndexOfIndexOut.java:19)

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