Java Vector ensureCapacity( ) Method with Example

Java Vector ensureCapacity( ) Method with Example

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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
       vec.add("One");
       vec.add("Two");
       vec.add("Three");
       vec.add("Four");
       vec.add("Five");
       vec.add("Six");
       vec.add("Seven");
       // 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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