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Java Basics

Java is a high-level, class-based, object-oriented programming language that is designed to have as few implementation dependencies as possible. It is a general-purpose programming language intended to let application developers write once, run anywhere (WORA), meaning that compiled Java code can run on all platforms that support Java without the need to recompile.

Hello World Example

                
                        
                        
                            public class HelloWorld {
                                public static void main(String[] args) {
                                    System.out.println("Hello, World!");
                                }
                            }

Variables and Data Types

Java has various data types to store different types of values. Here are some basic ones:

  • int: Stores integer values (whole numbers).
  • double: Stores floating-point numbers (numbers with decimals).
  • boolean: Stores true or false values.
  • char: Stores a single character.
  • String: Stores a sequence of characters (text).

                    int age = 30;
                    double price = 19.99;
                    boolean isJavaFun = true;
                    char initial = 'J';
                    String greeting = "Hello, Java!";

Operators

Java supports various operators for performing operations on variables and values.

  • Arithmetic operators: +, -, *, /, %
  • Comparison operators: ==, !=, >, <, >=, <=
  • Logical operators: && (AND), || (OR), ! (NOT)

                    int a = 10;
                    int b = 5;
                    int sum = a + b; // sum is 15
                    boolean isEqual = (a == b); // isEqual is false
                    boolean isTrue = a > 0 && b >