# Java Vector ensureCapacity( ) Method with Example

In the previous article, we have discussed about Java Vector capacity( ) Method with Example

In this article, we are going to see the use of Java Vector ensureCapacity() method along with examples.

## Java Vector ensureCapacity( ) Method with Example

This java.util.Vector.ensureCapacity() method ensures that the vector can hold a minimum number of elements passed to the method as a minimum capacity argument. It increases the size of the vector. Its return type is void.

Syntax:

vectorName.ensureCapacity(int minimum_req_capacity);

Where,

• vectorName refers to the name of the Vector.
• minimum_req_capacity refers to the parameter passed to the method which sets the minimum capacity required in the vector.

Approach:

• Create a vector of string data type and add some elements to it.
• Print the elements.
• Set the capacity of the vector to 20 by passing it to ensureCapacity( ) method.
• Now print the new capacity of the vector.

Program:

import java.util.*;
public class Main
{
public static void main(String[] args)
{
// Create a Vector of string datatype
Vector<String> vec = new Vector<String>();
// Adding some elements to the vector
// Prints the vector elements
System.out.println("The vector elements are "+vec);
// Prints the capacity of the vector
System.out.println("The capacity of the vector is "+vec.capacity());
// increases the capacity to 20
vec.ensureCapacity(20);
// Prints the new capacity of the vector
System.out.println("The new capacity of the vector is "+vec.capacity());
}
}

Output:

The vector elements are [One, Two, Three, Four, Five, Six, Seven]
The capacity of the vector is 10
The new capacity of the vector is 20

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