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Day -1 JAVA DSA INTRO

 

🎯 Goals of the Day

  • Understand why Java is a great choice for DSA

  • Set up your development environment

  • Learn Java basics required for DSA

  • Write your first Java program

    📘 1. Why Choose Java for DSA?

    • Object-Oriented: Easier to model real-world problems

    • Rich Standard Library: Collections like ArrayList, HashMap, etc.

    • Strong Typing & Readability: Prevents bugs and improves clarity

    • Platform Independent: Write once, run anywhere (thanks to JVM)

    • Used in Competitions & Interviews

      🧰 2. Java Setup

      Install:

      • JDK (Java Development Kit) – Download JDK 17+

      • IDE (Optional):

        • VS Code (with Java Extension Pack)

        • IntelliJ IDEA (recommended)

        • Eclipse

          Check Installation:

          bash
          java -version
          javac -version

          🧠 3. Java Basics You Need for DSA

          Focus only on these essentials first:

          🔹 Data Types & Variables:


          int, long, float, double, boolean, char, String

          🔹 Conditionals:



          if, else if, else, switch

          🔹 Loops:



          for, while, do-while

          🔹 Arrays & ArrayLists:


          int[] arr = new int[5];
ArrayList<Integer> list = new ArrayList<>();

          🔹 Functions (Methods):



          public static int sum(int a, int b) {
    return a + b;
}

          ✏️ 4. Your First Java Program


          public class Main {
    public static void main(String[] args) {
        System.out.println("Welcome to Java DSA!");
    }
}

          ✅ Compile & run:

          bash

          javac Main.java
java Main

          📚 5. What to Prepare for Day 1

          Tomorrow you’ll dive into Arrays: declaration, traversal, searching, and simple problems like max/min, sum, etc.

          Before that:

          • Revise basic Java syntax

          • Explore Scanner for input handling


          Scanner sc = new Scanner(System.in);
int n = sc.nextInt();

          🔥 Pro Tip:

          Start practicing small coding questions on platforms like:

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