What are the classes in Java for handling strings?

Several classes in Java are dedicated to handling strings.

1. The String class is the most commonly used class for strings in Java, it is used to store strings and provides various common string manipulation methods such as concatenation, substring, and replace.
2. StringBuilder class: used to handle mutable strings, allowing for a large number of string concatenation operations with higher efficiency than the String class.
3. StringBuffer class: Similar to the StringBuilder class, it is used to handle mutable strings, but it is thread-safe and suitable for string operations in a multi-threaded environment.
4. StringTokenizer class: used for splitting strings, it can separate a string into multiple substrings based on a specified delimiter.
5. Pattern and Matcher classes: used for matching and processing regular expressions, allowing for complex pattern matching on strings using regular expressions.
6. DecimalFormat class: used to format strings of numbers and currency values, converting numbers into strings according to a specified format.

The above are commonly used classes in Java for processing strings. Choose the appropriate class based on specific needs and scenarios for string manipulation.