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Introduction to Java Programming

Jul 13, 2024

Introduction to Java Programming

Course Outline

  • Divided into 2 parts:
    1. Introduction to Programming
    2. Data Structures and Algorithms

Introduction to Programming

  • Understanding code, coding, and programming
  • Learning Java fundamentals
  • 12 classes to cover various topics

Real-Life Analogy

  • Human communication uses languages (e.g., Hindi, English)
  • Computers use binary (0s and 1s)
    • High voltage = 1
    • Low voltage = 0
  • Binary representation examples
    • Decimal 0 = Binary 0
    • Decimal 1 = Binary 1
    • Decimal 2 = Binary 10
  • High-level languages (Java) make programming more understandable
  • Compiler converts Java code to binary

Programming Concepts

  • Giving instructions to computers requires programming
  • Using Java to command a computer

Example: Making Maggi

  • Instructions: ingredients, steps to cook, conditions
  • This is similar to giving instructions to a computer

Flowcharts and Pseudocode

  • Visual representation of process steps using flowcharts
  • Pseudocode: Written in plain English, later converted to actual code

Basic Program Example

Task: Add Two Numbers

  1. Start
  2. Input numbers
  3. Calculate sum
  4. Print result
  5. Exit

Pseudocode Representation

  1. Set up environment
  2. Input numbers
  3. Calculate sum
  4. Print sum
  5. Exit

Setting Up Java Development Environment

  • Install Java Development Kit (JDK)
  • Install a code editor or IDE (e.g., Visual Studio Code, IntelliJ, Eclipse)
  • Tutorial videos available for installation

Structure of a Java Program

  • Source code to be saved with .java extension
  • Compilation: Convert source code to bytecode
  • Execution: Bytecode run on Java Virtual Machine (JVM)

Writing and Running Java Code

  • Example code: Hello World
  • Save file as FirstClass.java
  • Run code to print Hello World
  • Understanding the output

Key Java Concepts

  • Functions/methods: Blocks of code performing tasks
  • Classes: Larger entities containing methods (similar to a kitchen containing various containers)
  • public static void main: Entry point of Java program

Homework

  • Download and install JDK and a code editor (e.g., Visual Studio Code)
  • Practice coding to understand concepts better

Full transcript