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Java Fundamentals

A Comprehensive Review for Beginners

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Executive Summary

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Java is a platform-independent, object-oriented language created in 1995
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Key features: bytecode compilation, JVM execution, and strong typing
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Covers syntax, data types, input/output, and basic operations
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Hands-on examples include 'Hello World' and user input programs

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Introduction to Java

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What is Java?

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Created in 1995 by Sun Microsystems
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Object-oriented: nearly everything is an object
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Platform-independent: runs on any JVM

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Originally named 'Oak' for the Green Team project
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Renamed to Java, inspired by Java coffee
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First public version: Java 1.0 (1995)

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Getting Started with Java

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Setting Up Your Environment

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Option 1: Online editors like W3Schools for instant coding
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Option 2: Local installation with JDK and an IDE
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First program: 'Hello World' demonstrates basic structure

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Hello World in Java

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Screenshot of a simple Java 'Hello World' program with code and output

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Core Java Syntax and Concepts

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Java Syntax Rules

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Case-sensitive: 'Main' is not the same as 'main'
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Class names start with uppercase (e.g., MyClass)
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Method names start with lowercase (e.g., calculateSum)

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File name must match the public class name
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Statements end with semicolons
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Code blocks use curly braces { }

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Output and Comments

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System.out.print() outputs text without a new line
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System.out.println() outputs text and moves to a new line
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Single-line comments use //
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Multi-line comments use /* ... */

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Variables and Data Types

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Variables store data values with syntax: type variableName = value
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Primitive types: byte, short, int, long, float, double, char, boolean
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String is a non-primitive type for text
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Scanner class enables user input (e.g., nextLine(), nextInt())

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Combining variables, arithmetic, and user input demonstrates Java's power in just a few lines of code.

Java Fundamentals Reviewer

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Key Takeaways and Next Steps

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Java is platform-independent and object-oriented • Master syntax, data types, and basic I/O for a strong foundation • Practice with small programs to reinforce concepts • Explore Oracle’s official documentation for deeper learning

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