StringBuilder Vs. StringBuffer: Differences and Applications

StringBuilder Vs. StringBuffer: Differences and Applications

6 mins read509 Views Comment
Updated on Jun 5, 2023 16:55 IST

This article will explore StringBuilder Vs. stringBuffer topic where you will also explore the applications of StrinBuilder and StringBuffer

2023_01_MicrosoftTeams-image-5.jpg

Strings are one of the most commonly used classes in Java. The StringBuffer and StringBuilder classes provide methods for manipulating strings. Both the Android development community and the public, in general, are familiar with strings. A string is a sequence of characters stored in a file or a database. In computer science, strings are used to store text, numeric values, and binary data. Android has its built-in string class that provides fast access to strings stored on the Android device. However, many third-party libraries provide faster access to strings stored in memory. This can be a useful optimization for slow or expensive database calls or file operations. Let’s take a look at StringBuilder Vs. stringBuffer. StringBuffer vs. StringBuilder is a common question in Java interviews.

Table of contents

Difference Between StringBuilder and StringBuffer

Feature StringBuilder StringBuffer
Thread-Safety Not thread-safe Thread-safe
Performance More efficient Slightly less efficient due to thread-safety
Synchronization Not synchronized Synchronized
Mutability Mutable Mutable
Usage Suitable for single-threaded environments Suitable for multi-threaded environments
Modifiability Supports modification and appending Supports modification and appending
Memory Allocation Less memory allocation overhead Slightly more memory allocation overhead
Recommended in Non-concurrent scenarios, performance-critical operations Concurrent scenarios, thread-safe environments

Also read: Difference between Static and Dynamic memory allocation

What is StringBuilder?

StringBuilder is a class in the Java programming language that allows you to create mutable (modifiable) strings. It is similar to the String class, which represents fixed-length, immutable character sequences. Still, StringBuilder is more efficient when you need to make many modifications to a string, such as appending multiple strings together or deleting characters from the middle of a string.

Here are some key points about StringBuilder:

  • StringBuilder is not synchronized, meaning it is not thread-safe, so it should not be used in a multithreaded environment. If you need to use a mutable string in a multithreaded environment, you should use StringBuffer instead.
  • StringBuilder has many methods that allow you to modify the String, such as append, insert, and delete.
  • StringBuilder is more efficient than StringBuffer when you need to make many modifications to a string, but it is less efficient than String when you only need to read the String or concatenate a few strings together.
  • StringBuilder was introduced in Java 1.5.

Syntax

 
StringBuffer abc = new StringBuffer(str);
Copy code
Multithreading in Java
Multithreading in Java
The below article goes through explaining the concepts of Multithreading in Java and its implementation. Let’s begin the tutorial.
Understanding ArrayList in Java
Understanding ArrayList in Java
The below article goes through explaining ArrayList in Java with suitable examples. It covers the creation and operations on ArrayList along with a few methods in it. Let’s begin!
Polymorphism in Java: Meaning and its Types
Polymorphism in Java: Meaning and its Types
Polymorphism is a fancy-sounding word that really just means “many shapes.” And in the world of Java programming, it refers to the ability of objects to take on different forms...read more

For more information, Read: Data Types in Java – Primitive and Non-Primitive Data Types Explained.

For more, Read: OOPs Concepts in Java.

Applications of StringBuilder

Here are some examples of situations where you might use a StringBuilder:

StringBuilder
Copy code
is used for efficient string building and manipulation.
  • It is suitable for concatenating multiple strings or dynamically constructing strings.
  • It is more efficient than using the “+” operator for string concatenation.
  • StringBuilder
    Copy code
    allows in-place modifications of strings.
  • It is commonly used in loop iterations to accumulate and build strings.
  • StringBuilder
    Copy code
    provides methods for formatting strings and appending formatted data.
  • It is helpful for custom string manipulation algorithms or operations.
  • Using
  • StringBuilder
    Copy code
    can improve performance and memory utilization compared to regular string concatenation.
  • It is a versatile class for efficient string handling in Java programming.
  • For more information: Method Overloading in Java

    Must check: Java Online Courses & Certifications

    Also explore: Free Java Courses Online

    What is a Stringbuffer?

    StringBuffer is a class in the Java programming language that allows you to create mutable (modifiable) strings. It is similar to the String class, which represents fixed-length, immutable character sequences. Still, StringBuffer is more efficient when you need to make many modifications to a string, such as appending multiple strings together or deleting characters from the middle of a string.

    Syntax

     
    StringBuilder abc = new StringBuilder(str);
    Copy code

    Here are some key points about StringBuffer:

    • StringBuffer is synchronized, meaning its methods are thread-safe and can be safely used in a multithreaded environment. If you need to use a mutable string in a single-threaded environment, it is generally more efficient to use StringBuilder instead.
    • StringBuffer has many methods that allow you to modify the String, such as append, insert, and delete. It also has some additional methods not available in StringBuilder, such as reverse and strength.
    • StringBuffer is more efficient than StringBuilder when you need to make many modifications to a string in a multithreaded environment. Still, it is not as efficient as String when you only need to read the String or concatenate a few strings together.
    • StringBuffer was introduced in Java 1.0.

    Applications of StringBuffer

    StringBuffer
    Copy code
    is used for efficient string manipulation and modification.
  • It provides thread-safe operations, making it suitable for multi-threaded environments.
  • It allows for appending, inserting, and deleting characters or strings within the buffer.
  • StringBuffer
    Copy code
    is commonly used when there is a need for mutable strings that can be modified by multiple threads simultaneously.
  • It is useful in scenarios where synchronization and thread safety are important requirements.
  • StringBuffer
    Copy code
    can be used for building and manipulating large strings or when working with concurrent data processing.
  • It provides methods to efficiently reverse, replace, or concatenate strings within the buffer.
  • StringBuffer
    Copy code
    is suitable for scenarios where the order of string operations needs to be preserved.
  • It offers better performance than regular string concatenation in multi-threaded scenarios due to its synchronization capabilities.
  • StringBuffer
    Copy code
    is a versatile class for efficient and synchronized string manipulation in Java programming.

    Key Differences between StringBuilder and StringBuffer 

    They both are used to create mutable (modifiable) strings in Java. Some differences are listed below-

    • StringBuffer is synchronized, meaning its methods are thread-safe and can be safely used in a multithreaded environment. On the other hand, StringBuilder is not synchronized, which makes it faster than StringBuffer, but it is not thread-safe and should not be used in a multithreaded environment.
    • StringBuffer has all of the same methods as StringBuilder, but StringBuilder has some additional methods that make it easier to use, such as appendCodePoint and insert.
    • StringBuffer was introduced in Java 1.0, while StringBuilder was introduced in Java 1.5.

    In general, if you need to use a mutable string in a single-threaded environment, it is recommended to use StringBuilder because it is faster. If you need to use a mutable string in a multithreaded environment, you should use StringBuffer.

    Conclusion

    A string builder implements the C++ standard library class using an internal buffer instead of a constant-length memory pool. This allows for faster app processing. However, it also increases memory consumption and processor load since the buffer must be copied into main memory as each new String is created. Typically, string builders are slower than regular string buffers when accessing very large strings or repetitive characters. However, they’re faster when accessing smaller strings that only produce a few repetitions of a similar pattern.

    Related reads:

    The Ultimate Singleton Class Guide: Boost Your Java Code Efficiency Today
    The Ultimate Singleton Class Guide: Boost Your Java Code Efficiency Today
    In this article, we will learn what a singleton class in Java is, how it works, and how it can benefit your java programming projects. Explore the real-world examples, and...read more
    All About indexOf() Method of String Class in Java
    All About indexOf() Method of String Class in Java
    Explore the power of the indexOf() method in Java’s String class with our in-depth guide. Understand its syntax, return values, overloads, and practical uses in string manipulation. Suitable for newbies...read more
    All About Inner Class in Java
    All About Inner Class in Java
    Uncover the intricacies of inner classes in Java with our extensive guide. From basic concepts to practical examples, learn how to define, instantiate, and use inner classes effectively. Ideal for...read more

    FAQs

    Can I convert StringBuffer to StringBuilder and vice versa?

    Yes, you can convert between StringBuffer and StringBuilder by using their respective constructors. However, keep in mind that the thread safety aspect will be lost when converting from StringBuffer to StringBuilder

    Which one should I choose, StringBuilder or StringBuffer?

    Choose StringBuilder if you are working in a single-threaded environment or if you can ensure thread safety through other means. Choose StringBuffer if you are working in a multi-threaded environment and require thread safety.

    Which one is faster, StringBuilder or StringBuffer?

    In general, StringBuilder is faster than StringBuffer because it doesn't incur the overhead of synchronization. However, the performance difference may be negligible in certain scenarios.

    About the Author

    This is a collection of insightful articles from domain experts in the fields of Cloud Computing, DevOps, AWS, Data Science, Machine Learning, AI, and Natural Language Processing. The range of topics caters to upski... Read Full Bio