Explain Java Tokens?

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 units in a program are known as tokens.

In simple, a Java program is a collection of tokens, comments and white space.

Java language includes five types of tokens: 1)  Reserved keywords   2) Identifiers        3) Literals 4) Operators 5) Separators Keywords : Keywords are an essential part of a language definition. ® Java language has reserved words as keyword. ® Keywords have specific meaning in Java we cannot use them as names for variables, classes, methods and so … on. ® All keywords are to be written in lower case letters. ® Java is case sensitive. Identifies : ® Identifiers are programmer designed tokens. ® They are used for naming classes, methods, variable objects, labels, packages and interfaces in a program. ® Java identifiers follow the following rules. 1) They can have alphabets, digits & underscore & dollar sign characters. 2) They must not begin with a digit. 3) Upper case & lower case letters are distinct. 4) They can be of any length. Literal : Literals in Java are a sequence of character (digits, letters and other character) that represent constant values to be stored in variables.       Integer literals Floating point literals Character literals String literals Boolean literals Operators :  An operator is a symbol that takes one or more argyments and operates on them to produce a result. Separators :  Separators are symbols used to indicate where groups of code are divided and arranged. Parentheses ( ) : Used to enclosed parameters in method definition. Braces { }: 1. Define a block of code for classes methods and local scope. 2. Automatically initialize values to array. Brackets [ ] : Used to declare array types. Semicolon (;) : Used to separate statement. Comma (,) : Used to separate identifiers in a variable deceleration.