Java Tokens

Tokens used in Java Programs

Reserved Keywords, Identifiers, Literals, Operators, Separators

A Java program is basically a collection of classes. A class is defined by a set of declaration statements and methods containing executable statements. Most statements contain expressions, which describe the actions carried out on data. Smallest individual unit in a program are known as tokens. The compiler recognizes them for building up expressions and statements. 

Java Character Set

The smallest units of Java language are the characters used to write Java tokens. These characters are defined by the Unicode character set, and emerging standard that tries to create characters for a large number of scripts world wide.
The Unicode is a 16-bit character coding system and currently supports more than 34,000 defined characters derived from 24 languages from America, Europe, Middle East, Africa and Asia. However, most of us use only  the basic ASCII characters, which include letters, digits and punctuation marks, used in normal English. We therefore, have used only ASCII character character set (a subset of UNICODE character set) in developing the programs. 

Java language includes five types of tokens and they are:

• Reserved Keywords

• Identifiers

• Literals

• Operators

• Separators

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