The difference between string buffers and string builders in Java

String buffer and StringBuilder are mutable classes that can be used to perform operations on string objects, such as reversing strings, compressing strings, etc. We can modify strings without creating new string objects. String buffer is thread-safe, while StringBuilder is not thread-safe. Therefore, it is faster than string buffer. In addition, string concat +Operators are internally used by StringBuffer or StringBuilder class. Here are the differences.

Index	Key	String Buffer	String Generator
1	Basic	StringBuffer was introduced in the initial version of Java	It was introduced in Java 5introduced
2	Synchronous	It is synchronous	Asynchronous
3	Performance	It is thread-safe. Therefore, multiple threads cannot access it at the same time, so it is slow.	It is not thread-safe, so it is faster than the string buffer
4	Mutable	It is mutable. We can modify the string without creating an object	It is also mutable
5	storage	heap	heap

StringBuilder Example

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

StringBuffer Example

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

Basic Tutorial