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Java StringBuffer int capacity() method with Example

Java StringBuffer int capacity() method: Here, we are going to learn about the int capacity() method of StringBuffer class with its syntax and example.
Submitted by Preeti Jain, on June 29, 2019

StringBuffer Class int capacity()

• This method is available in package java.lang.StringBuffer.capacity().
• This method is used to return the capacity of the StringBuffer(i.e. It is the amount of extra storage for the object that we can store beyond allocation).
• The formula to find the capacity of any StringBuffer object is 16 + "No. of characters".

Syntax:

    int capacity(){
    }

Parameter(s):

We don't pass any object as a parameter in the method of the StringBuffer.

Return value:

The return type of this method is int that means this method returns capacity of the StringBuffer object in number.

Java program to demonstrate example of capacity() method

import java.lang.StringBuffer;

public class StringBufferClass {
    public static void main(String[] args) {

        StringBuffer sb = new StringBuffer("Java is a programming language");

        // use capacity() it will return the capacity(i.e 16 + 30) 
        // of the StringBuffer object sb.
        System.out.println("The capacity of the StringBuffer object is :" + sb.capacity());

        sb = new StringBuffer("10");

        // use capacity() it will return the capacity(i.e. 16 + 2) 
        // of the another StringBuffer object sb .
        System.out.println("The capacity of the another StringBuffer object is :" + sb.capacity());

        sb = new StringBuffer(" ");

        // use capacity() it will return the capacity(i.e. 16 + 1) 
        // of the another StringBuffer object sb.
        System.out.println("The capacity of the another StringBuffer object is :" + sb.capacity());
    }
}

Output

D:\Programs>javac StringBufferClass.java

D:\Programs>java StringBufferClass
The capacity of the StringBuffer object is :46
The capacity of the another StringBuffer object is :18
The capacity of the another StringBuffer object is :17