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Java Tokens

? Java Tokens

? Quick Overview

Java tokens are the smallest individual units in a Java program. The Java compiler breaks source code into tokens to understand the structure and meaning of the program.

? Key Concepts

  • Tokens are the building blocks of Java programs
  • Every valid Java program is a sequence of tokens
  • Whitespace and comments separate tokens
  • Tokens follow strict Java syntax rules

? Syntax / Theory

Java tokens are classified into five main categories:

  • Keywords – Reserved words with predefined meaning
  • Identifiers – Names of variables, classes, methods
  • Literals – Constant values used in code
  • Operators – Symbols performing operations
  • Separators – Special characters that separate code
? View Code Example
// Example showing different Java tokens
int number = 10;
String name = "Java";
if(number > 5){
System.out.println(name);
}

?️ Live Output / Explanation

In the example above:
int, String, if are keywords
number, name are identifiers
10, "Java" are literals
=, > are operators
;, { } are separators

? Tips & Best Practices

  • Do not use Java keywords as identifiers
  • Use meaningful and readable identifier names
  • Follow Java naming conventions strictly
  • Avoid unnecessary symbols and spacing

? Try It Yourself

  • Write a Java program and identify all tokens
  • List keywords used in a simple class
  • Separate literals and identifiers from code
  • Create examples for each token type