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Vector capacity() Method in Java

Last Updated : 17 Aug, 2018

The Java.util.Vector.capacity() method in Java is used to get the capacity of the Vector or the length of the array present in the Vector.

Syntax:

Vector.capacity()

Parameters: The method does not take any parameter.

Return Value: The method returns the capacity or the internal data array’s length present in the Vector, which is an integer value.

Below programs illustrate the Java.util.Vector.capacity() method:

Program 1: Vector with string elements.

// Java code to illustrate capacity() 
import java.util.*; 
  
public class VectorDemo { 
    public static void main(String args[]) 
    { 
        // Creating an empty Vector 
        Vector<String> vec_tor = new Vector<String>(); 
  
        // Use add() method to add elements into the Vector 
        vec_tor.add("Welcome"); 
        vec_tor.add("To"); 
        vec_tor.add("Geeks"); 
        vec_tor.add("4"); 
        vec_tor.add("Geeks"); 
  
        // Displaying the Vector 
        System.out.println("Vector: " + vec_tor); 
  
        // Displaying the capacity of Vector 
        System.out.println("The capacity is: " + vec_tor.capacity()); 
    } 
} 

Output:

Vector: [Welcome, To, Geeks, 4, Geeks]
The capacity is: 10

Program 2: Vector with Integer elements.

// Java code to illustrate capacity() 
import java.util.*; 
  
public class VectorDemo { 
    public static void main(String args[]) 
    { 
        // Creating an empty Vector 
        Vector<Integer> vec_tor = new Vector<Integer>(); 
  
        // Use add() method to add elements into the Vector 
        vec_tor.add(10); 
        vec_tor.add(15); 
        vec_tor.add(30); 
        vec_tor.add(20); 
        vec_tor.add(5); 
  
        // Displaying the Vector 
        System.out.println("Vector: " + vec_tor); 
  
        // Displaying the capacity of Vector 
        System.out.println("The capacity is: " + vec_tor.capacity()); 
    } 
} 

Output:

Vector: [10, 15, 30, 20, 5]
The capacity is: 10

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