Difference Between StringBuilder and StringBuffer in Java

1. the StringBuffer in Java
2. the StringBuilder in Java
3. Differences Between StringBuilder and StringBuffer in Java

This tutorial will discuss the differences between Java’s StringBuilder and StringBuffer classes. So let’s get started!

the StringBuffer in Java

The StringBuffer class gives us a means by which we can use mutable string data in Java. These strings may be utilized in an unconcerned manner by numerous threads at the same time without risk.

Syntax:

StringBuffer b = new StringBuffer("Shanii");

Example:

public class BufferexamplebyZeeshan {
  public static void main(String[] args) {
    StringBuffer b = new StringBuffer(" Hi! ");
    b.append(" Muhammad Zeeshan Here! ");
    b.append(" Let's Code ");
    System.out.println(b);
  }
}

Output:

Hi! Muhammad Zeeshan Here! Let's Code

the StringBuilder in Java

StringBuilder also gives us access to mutable strings, though this implementation has no thread safety. Numerous threads can’t utilize it at the same time.

Because this class does not apply this additional functionality, it is much quicker than StringBuffer.

Syntax:

StringBuilder s1 = new StringBuilder("Shani");

Example:

public class BuilderexamplebyZeeshan {
  public static void main(String[] args) {
    StringBuilder s = new StringBuilder(" Hey!");
    s.append("I am a Programmer");
    System.out.println(s);
  }
}

Output:

Hey!I am a Programmer

Differences Between StringBuilder and StringBuffer in Java

Let’s see the differences between StringBuilder and StringBuffer by the below statements:

Example Using StringBuilder and StringBuffer

StringBuilder is quicker than StringBuffer since it’s not synchronized. Let’s have a look at a basic example to compare both StringBuilder and StringBuffer:

public class Main {
  public static void main(String[] args) {
    int RandomNumber = 5677839;
    long time;
    StringBuffer s = new StringBuffer();
    time = System.currentTimeMillis();
    for (int i = RandomNumber; i-- > 0;) {
      s.append("");
    }
    System.out.println(System.currentTimeMillis() - time);

    StringBuilder b = new StringBuilder();
    time = System.currentTimeMillis();
    for (int i = RandomNumber; i > 0; i--) {
      b.append("");
    }
    System.out.println(System.currentTimeMillis() - time);
  }
}

Output:

161
17

The above example provides the numerical comparison of 161 milliseconds for StringBuffer and 17 milliseconds for StringBuilder, which makes it quite evident that StringBuilder is the more efficient option.