java.util.Vector.contains() Method

Description

The contains(Object elem) method is used to test the existence of an element in a vector.

Declaration

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

public boolean contains(Object elem)

Parameters

elem − This is an object as input.

Return Value

true − It returns true if and only if the specified object is the same as a component in this vector.Otherwise it returns false.

Exception

• ClassCastException − if the type of the specified element is incompatible with this collection (optional).

• NullPointerException − if the specified element is null and this collection does not support null elements (optional).

Example

The following example shows the usage of java.util.Vector.contains() 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(1);

      // let us check the existence of number 4 in the vector
      System.out.println("Checking the existence of number 4 :- "+vec.contains(4));
   }
}

Let us compile and run the above program, this will produce the following result.The method call returns true as the number exists in the vector

Checking the existence of number 4 :- true