In this repository I have tried to include what I have learnt about java. I'm also going to add code and Handwritten notes parallely.
❗Press CTRL+F to find any topic in this document.

! To Work with java, jdk(java development kit) is necessary. Learn more about this

• To check the Java version installed in your machine
  • press Windows key & type CMD
  • press Enter key and type command to check java version

   java -version

  • if output displayed like : then your system have installed the java.
    ! Note : your java version can be different.
  • If it does not shows up like it then you must need to install java on your system.
• For downloading installer to install java on your system click here

• Visual Studio Code (install java extension)
• IntelliJ IDEA
• Notepad + CMD
  1. First create folder.
  2. Save file in that folder with .java extension to that file.
  3. Go to that folder and right click and open that folder in CMD / Terminal.
  4. First compile that file by command

  javac fileName.java
  

  5. Now if it have no errors lets run it by command

  java className
  

• 1.0 Introduction
  • 1.1 History
  • 1.2 Working of Java and code breakdown
  • 1.3 Data Types
  • 1.4 Types of Variables
  • 1.5 Reading Data from KeyBoard
• 2.0 Operators and Expression
  • 2.1 Types of operators
  • 2.2 Precedence of operators
  • 2.3 Increment and decrement operators
  • 2.4 Working of Bitwise operator
• 3.0 Control Statements
  • 3.1 Conditionals ( If , if-else, if-elseif-else, switch)
  • 3.2 Iteration/Loops
  • 3.3 Break & Continue statement
  • 3.4 Type Casting (Off the topic but important)
• 4.0 Number System
  • 4.1 Number System
  • 4.2 ASCII Values
• 5.0 Array
  • 5.1 Array
  • 5.2 Multi Dimensional Array
• 6.0 OOP
  • 6.1 Class & Objects
  • 6.2 Constructor
  • 6.3 Instance and static block
  • 6.4 Methods
    • Static Method
    • Method Overloading
    • Variable arguments(varargs)
  • 6.5 Static
  • 6.6 Inner class
  • 6.7 Singleton class
• 7.0 OOP Terminology
  • 7.1 Inheritance
  • 7.2 Polymorphism
  • 7.3 Abstraction
  • 7.4 Encapsulation
  • 7.5 Super and Final keyword
  • 7.6 Types of relationship
  • 7.7 Aggregation
  • 7.8 Abstract class and abstract method
• 8.0 Interfaces
  • 8.1 Info
  • 8.2 Extending an interface
• 9.0 Arraylist (Dynamic array)
  • 9.1 Array vs Arraylist
  • 9.2 Creating Arraylist
• 10.0 Exception handling
  • 10.1 Basic Info(Exception, errors)
  • 10.2 Types of Exceptions
  • 10.3 Handling Exceptions
    • try..... catch block
    • try..... finally block
    • Catching multiple exceptions
    • Throw and throws keyword
• 11.0 Multitasking , multithreading and multiprocessing
  • 11.1 Multitasking
  • 11.2 Multiprocessing
  • 11.3 Single threading
  • 11.4 Multithreading
    • multithreading vs multiprocessing
    • Advantages
    • Thread class
      • Lifecycle of thread
      • Execution
      • Methods in thread class
  • 11.5 Synchronization
• 12.0 Collections framework
  • 12.1 Interfaces of collections framework
  • 12.2 Collection Interface
    • Collections Interface vs Collections framework
    • Subinterfaces of Collections
      • List interface
      • Set interface
      • Queue interface
      • Map interface
      • Iterator Interface
        • Methods of Iterator
    • List interface
      • ArrayList
      • LinkedList
    • Vector class
    • Stack class
    • Set Interface
      • Hashset class
      • Linkedhashset class
      • Treeset class
    • Map Interface
    • HashMap set
      • LinkedHashMap Class

I love connecting with different people so if you want to say hi, I'll be happy to meet you more! 😊