In Java, the
StringBuffer class is part of the
java.lang package and provides a mutable sequence of characters. This means you can modify the content of a
StringBuffer object without creating a new object each time a modification is made. The
StringBuffer class is similar to the
String class, but it is mutable, whereas
String objects are immutable.
Here are some key points about
- Mutable: Unlike strings, which are immutable in Java,
StringBufferallows you to modify the contents of the string without creating a new object.
StringBufferis thread-safe, meaning it’s designed to be used by multiple threads concurrently without causing data inconsistency issues. However, this comes at the cost of performance, as the methods are synchronized.
- Performance Implications: While
StringBufferprovides thread safety, it can be less efficient than its non-synchronized counterpart,
StringBuilder, which was introduced in Java 5. If you don’t need thread safety, it’s generally recommended to use
StringBuilderfor better performance.
These are just a few examples of the methods provided by
StringBuffer. Remember, if you don’t need thread safety, you may prefer to use
StringBuilder for better performance in a non-threaded environment.