On this document we will be showing a java example on how to use the length() method of StringBuilder Class. Basically the length() method returns the character count of the contents of this StringBuilder.


  • This method is specified by length in interface CharSequence.

Method Syntax

public int length()

Method Argument

Data Type Parameter Description

Method Returns

The length() method returns the length of the sequence of characters currently represented by this object.


Requires Java 1.5 and up

Java StringBuilder length() Example

Below is a java code demonstrates the use of length() method of StringBuilder class. The example presented might be simple however it shows the behavior of the length() method.


import java.util.Scanner;

 * A java example source code to demonstrate
 * the use of length() method of StringBuilder class

public class StringBuilderLengthExample {

	public static void main(String[] args) {

        // initialize the StringBuilder object
        StringBuilder sb = new StringBuilder("");
        // ask for user input
        System.out.print("Please enter your name:");
        Scanner s = new Scanner(;
        // print the number of characters of the StringBuilder object
        System.out.println("Length of your name:"+sb.length());


The above java example source code demonstrates the use of length() method of StringBuilder class. Basically this code just takes a user input and then the program will display the character length of the user input. This source code is a good example in learning on how to initialize StringBuilder object, modify the contents of the StringBuilder object and printing the length of how many characters stored on the buffer.

Sample Output

Below is the sample output when you run the above example.

StringBuilder length() example output