What is the vector.contains method in Java?

The contains() method of the Vector class can be used to check if an element is present in the Vector object.

Syntax

public boolean contains(Object o)

Return value

This method returns true if the passed element present in the vector object. Otherwise, it returns false.

The element is matched using the equals method. Internally, the element and passed argument is matched using:

(argument==null ? element == null : argument.equals(element))

Code

import java.util.Vector;
class VectorContainsElementExample {
    public static void main( String args[] ) {
        // Creating Vector
        Vector<Integer> vector = new Vector<>();
        // add elememts 
        vector.add(1);
        vector.add(2);
        vector.add(3);
        System.out.println("The vector is : " + vector);
        System.out.println("Checking if 1 is present : " + vector.contains(1));
        System.out.println("Checking if 2 is present : " + vector.contains(2));
        System.out.println("Checking if 5 is present : " + vector.contains(5));
        
    }
}

Explanation

In the code above, we created a Vector object and added elements 1, 2, 3 to it using the add method. We then used the contains(index) method to check if the element is present in the Vector object.

For the value 1 and 2 the contains method returns true. For the value 5 it returns false because 5 is not present in the Vector object.

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