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Java for Beginners – A Friendly Start

Java for Beginners

Welcome to Java!
It’s a powerful, object-oriented programming language used for everything from Android apps to enterprise software. Let’s get you coding in no time.

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🧰 1. Setting Up Your Environment

Step 1: Install JDK (Java Development Kit)

Download from: Oracle Java Downloads
➡️ Choose JDK 21 or later (LTS version recommended)

Step 2: Install an IDE (Recommended)

Pick your favorite:

• IntelliJ IDEA Community (Free)

• VS Code + Java Extension Pack

• Or simply use a text editor + terminal

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💻 2. Your First Java Program

Create a file named HelloWorld.java

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

Compile & Run:

javac HelloWorld.java
java HelloWorld

Output:

Hello, World!

💡 Note: The file name must match the public class name.

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🧠 3. Basic Syntax Cheat Sheet

Concept	Example
Variables	int age = 25;
Strings	String name = "Alice";
Print	System.out.println("Hi");
Input	Use Scanner (see below)
Comments	// single line or /* multi line */

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🔢 4. Data Types

int age = 25;           // whole numbers
double price = 19.99;   // decimal numbers
char grade = 'A';       // single character
boolean isStudent = true; // true or false
String name = "Bob";    // text

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🧾 5. Taking Input (Using Scanner)

import java.util.Scanner;

public class InputExample {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        System.out.print("Enter your name: ");
        String name = scanner.nextLine();

        System.out.print("Enter your age: ");
        int age = scanner.nextInt();

        System.out.println("Hello " + name + ", you are " + age + " years old.");

        scanner.close();
    }
}

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⚖️ 6. Conditionals (if, else)

int age = 18;

if (age >= 18) {
    System.out.println("You can vote!");
} else {
    System.out.println("Too young to vote.");
}

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🔁 7. Loops

for loop

for (int i = 1; i <= 5; i++) {
    System.out.println("Count: " + i);
}

while loop

int i = 1;
while (i <= 5) {
    System.out.println("Count: " + i);
    i++;
}

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🧮 8. Methods (Functions)

public class Calculator {
    public static int add(int a, int b) {
        return a + b;
    }

    public static void main(String[] args) {
        int sum = add(5, 3);
        System.out.println("5 + 3 = " + sum);
    }
}

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🧑‍💻 9. Mini Project: Simple Calculator

import java.util.Scanner;

public class SimpleCalculator {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        System.out.print("Enter first number: ");
        double num1 = sc.nextDouble();

        System.out.print("Enter second number: ");
        double num2 = sc.nextDouble();

        System.out.println("Sum: " + (num1 + num2));
        System.out.println("Difference: " + (num1 - num2));
        System.out.println("Product: " + (num1 * num2));

        if (num2 != 0) {
            System.out.println("Division: " + (num1 / num2));
        } else {
            System.out.println("Cannot divide by zero!");
        }

        sc.close();
    }
}

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🚀 Next Steps

✅ Learn Arrays →

int[] numbers = {1, 2, 3};

✅ Learn OOP Basics → Classes, Objects, Constructors

✅ Practice on:

• HackerRank

• CodingBat

• LeetCode (Easy)

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📚 Useful Resources

Resource	Link
Official Java Tutorials	https://docs.oracle.com/javase/tutorial/
YouTube Course	Search "Java Programming for Beginners – freeCodeCamp"
Interactive Practice	https://www.w3schools.com/java/

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💪 Keep Going!

Even 15 minutes of coding daily adds up fast.
Keep learning, experimenting, and building — you’ve got this!