Java Vector capacity() Method

The capacity() method of Java Vector class is used to get the current capacity of the vector which is in use.

Syntax:

Following is the declaration of capacity() method:

Parameter:

This method does not accept any parameter.

Returns:

This method returns the current capacity of the vector which is in use.

Exceptions:

Compatibility Version:

Java 1.2 and above

Example 1:

import java.util.Vector;
public class VectorCapacityExample1 {  
	public static void main(String arg[]) {
		//Create an empty Vector with initial capacity of 5      
		Vector<Integer> vecObject = new Vector<Integer>(5);
		//Add values in the vector
		vecObject.add(3);
		vecObject.add(5);
		vecObject.add(2);
		vecObject.add(4);
		vecObject.add(1);
	      System.out.println("Current capacity of Vector is: "+vecObject.capacity());	      
            }
}

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Output:

Current capacity of Vector is: 5

Example 2:

import java.util.Vector;
public class VectorCapacityExample2 {  
	public static void main(String arg[]) {
		//Create an empty Vector with an initial capacity of 3      
	      Vector<String> vc = new Vector<>(3);
	      //Add elements in the vector
	      vc.add("A");
	      vc.add("B");
	      vc.add("C");	      
	      //Print all the elements of a Vector
	      System.out.println("Elements of Vector are: "+vc); 	      
	      System.out.println("Current capacity of Vector: "+vc.capacity());
	      //Add new element
	      vc.add("JavaTpoint");
	      //After addition, print all the elements again 
	      System.out.println("Elements after addition: "+vc); 	      
	      System.out.println("Current capacity of Vector after modification: "+vc.capacity());
            }
}

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Output:

Elements of Vector are: [A, B, C]
Current capacity of Vector: 3
Elements after addition: [A, B, C, JavaTpoint]
Current capacity of Vector after modification: 6

Example 3:

import java.util.Vector;
public class VectorCapacityExample3 {  
	public static void main(String arg[]) {
		//Create an empty Vector    
	      Vector<String> vc = new Vector<>();
	      //Add elements in the vector
	      vc.add("A");
	      vc.add("B");
	      vc.add("C");	      	      
	      System.out.println("Default capacity of Vector: "+vc.capacity());
            }
}

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Output: