Java Programming

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Module 1: Getting Started with Java

Introduction to Java

intro-java

Your First Java Program

hello-java

Comments in Java

java-comments

Module 2: Variables & Data Types

Primitive Data Types

primitive-types

Strings

java-strings

Type Casting

type-casting

Module 3: Control Flow

If-Else Statements

if-else

For Loops

for-loops

While Loops

while-loops

Module 4: Object-Oriented Programming

Classes and Objects

classes-objects

Constructors

constructors

Inheritance

inheritance

Module 5: Arrays & Collections

Arrays

arrays

ArrayList

arraylist

HashMap

hashmap

Variables & Data Types

Primitive Data Types

Java has 8 primitive data types.

Numeric Types

Type	Size	Range
`byte`	1 byte	-128 to 127
`short`	2 bytes	-32,768 to 32,767
`int`	4 bytes	~±2 billion
`long`	8 bytes	Very large numbers
`float`	4 bytes	Decimal (less precise)
`double`	8 bytes	Decimal (more precise)

Other Types

Type	Description	Example
`boolean`	true or false	`true`
`char`	Single character	`'A'`

Declaration

int age = 25;
double price = 19.99;
boolean isActive = true;
char grade = 'A';

Visualizer

assigned to

age

Interactive Visualization

java

Output

Run execution to see output...