#Coding || Java Tokens
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.
Basically,A java program is a collection of tokens, comments and white spaces.Java language includes five types of tokens. They are:-
- Reserved Keywords
- Identifiers
- Literals
- Operators
- Separators.
Java Character Set
The smallest units of Java language are the characters used to write Java tokens. These characters an defined by the Unicode character set, an emerging standard that tries to create characters for a large numbe of scripts worldwide.
The Unicode is a 16-bit character coding system and currently supports more than 34,000 define characters derived from 24 languages from America, Europe, Middle East, Africa and Asia (including India). However, most of us use only the basic ASCII characters, which include letters, digits and punctuation marks, used in normal English.
Keywords
*Keywords are an essential part of a language definition. They implement specific features of the language .
*Java language has reserved 50 words as keywords.
* Keyword 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, one can use these words as identifiers by changing one or more letters to upper case.
Java Keywords
abstract byte case do class extends for const double continue finally interface default float return super throw void final goto instanceof native if protected static synchronize transient while import long private short switch throws volatile now public strictip this try
Note: We should also not attempt to use the boolean values true and false or null as names in our programs.
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