Difference between String buffer and String builder in Java

JavaObject Oriented ProgrammingProgramming

String buffer and StringBuilder both are mutable classes which can be used to do operation on string objects such as reverse of string, concating string and etc. We can modify string without creating a new object of the string. A string buffer is thread-safe whereas string builder is not thread-safe.  Therefore, it is faster than a string buffer. Also, a string concat + operator internally uses StringBuffer or StringBuilder class. Below are the differences.

Sr. No.KeyString BufferString Builder
1
Basic
StringBuffer was introduced with the initial release of Java 
It was introduced in Java 5
2
Synchronized
It is synchronized 
It is not synchronized 
3Performance 
It is thread-safe. So, multiple threads can’t access at the same time, therefore, it is slow.
It is not thread-safe hence faster than String Buffer 
4Mutable 
It is mutable. We can modify string without creating an object 
It is also mutable 
5
Storage 
Heap
Heap

Example of StringBuilder

public class StringBuilderExample{
   public static void main(String[] args){
      StringBuilder builder=new StringBuilder("Hi");
      builder.append("Java 8");
      System.out.println("StringBuilderExample" +builder);
   }
}

Example of StringBuffer

public class StringBufferExample{
   public static void main(String[] args){
      StringBuffer buffer=new StringBuffer("Hi");
      buffer.append("Java 8");
      System.out.println("StringBufferExample" +buffer);
   }
}
raja
Published on 18-Nov-2019 07:16:40
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