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Characters and Strings

The Java platform contains four classes that you can use when working with character data:

• Character—A class whose instances can hold a single character value. This class also defines handy methods that can manipulate or inspect single-character data.
• String—A class for working with immutable (unchanging) data composed of multiple characters.
• StringBuffer—A class for storing and manipulating mutable data composed of multiple characters. This class is safe for use in a multi-threaded environment.
• StringBuilder—A faster, drop-in replacement for StringBuffer, designed for use by a single thread only.

This section covers these string-related topics:

• Characters
• Strings and String Buffers
• Creating Strings and String Buffers
• Getting the Length of a String or String Buffer
• Getting Characters by Index from a String or String Buffer
• Searching for a Character or a Substring within a String
• Comparing Strings and Portions of Strings
• Manipulating Strings
• Modifying String Buffers
• Strings and the Compiler
• Summary of Characters and Strings

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