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| • The char data type represents a single character. • The char constant is denoted by a single quotation mark, for example, ‘a’. • The character coding scheme used widely today is ASCII (American Standard Code for Information Exchange). • Java uses Unicode, which is capable of representing characters of diverse languages. ASCII is compatible with Unicode. • Astring is a sequence of characters, and in Java, strings are represented by String objects. • The Pattern and Matcher classes are introduced in Java 2 SDK 1.4. They provide support for pattern-matching applications. • Regular expression is used to represent a pattern to match (search) in a given text. • The String objects are immutable. Once they are created, they cannot be changed. • To manipulate mutable strings, use StringBuffer. • Strings are objects in Java, and the rules for comparing objects apply when comparing strings. • Only one String object is created for the same literal String constants. • The standard classes described or used in this chapter are: String Pattern StringBuffer Matcher StringBuilder |