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.

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Java language has reserved words as keyword.

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Keywords have specific meaning in Java we cannot use them as names for variables, classes, methods and so … on.

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All keywords are to be written in lower case letters.

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Java is case sensitive.

Identifies :

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Identifiers are programmer designed tokens.

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They are used for naming classes, methods, variable objects, labels, packages and interfaces in a program.

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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.

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