OOP through Java - R23 - Important topics

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 OOP through Java - R23 - Important topics

Unit I: Object-Oriented Programming

✅ Most Important

  • Basic Concepts & Principles of OOP

  • Program Structure in Java (Class, Objects, Methods)

  • Data Types, Variables, Operators (esp. Arithmetic, Relational, Logical, Assignment, Increment/Decrement, Ternary)

  • Control Statements (if-else, switch, loops)

⭐ Important

  • Command Line Arguments, User Input, Escape Sequences

  • Precedence & Associativity of Operators

  • Scope of Variables, Static Variables/Methods, Final Keyword

🔹 Medium

  • Formatted Output using printf()

  • Comments & Coding Style

Unit II: Classes and Objects

✅ Most Important

  • Class Declaration & Object Creation

  • Constructor Methods (Default, Parameterized, Overloaded)

  • Access Specifiers (public, private, protected, default)

  • Passing Arguments by Value and by Reference

⭐ Important

  • Nested Classes, Final Class & Methods

  • Overloaded Methods, Recursive Methods

  • Static Methods and Variables

🔹 Medium

  • Class Objects as Parameters

  • Access Control for Class Members

Unit III: Arrays, Inheritance, Interfaces

✅ Most Important

  • Declaration, Initialization, and Storage of Arrays

  • Two-dimensional & Multidimensional Arrays

  • Inheritance: Types, super Keyword, Method Overriding, Dynamic Method Dispatch

  • Abstract Classes & Interfaces (Declaration & Implementation)

⭐ Important

  • Array Operations (search, sort, assign, copy, resizing)

  • Multilevel Inheritance, Multiple Interfaces

  • Default & Static Methods in Interfaces

🔹 Medium

  • Vectors and Arrays of Varying Lengths

  • Functional Interfaces, Annotations

Unit IV: Packages and Java Library, Exception Handling, Java I/O

✅ Most Important

  • Defining & Importing Packages, Access Control, java.lang Package

  • Wrapper Classes, Auto-boxing & Unboxing

  • Exception Handling: try, catch, finally, throw, throws

  • Checked vs Unchecked Exceptions

⭐ Important

  • java.util Classes (Enumeration, Date/Time API, Formatter)

  • Java I/O Streams (Byte Streams, Character Streams, File Handling basics)

🔹 Medium

  • Temporal Adjusters, Adjusters Class

  • Scanner Class, Path & ClassPath

Unit V: String Handling, Multithreading, JDBC, JavaFX

✅ Most Important

  • String Handling (String, StringBuffer, StringBuilder) – operations, comparison, modification

  • Multithreading: Thread Class, Runnable Interface, Thread Life Cycle, Synchronization, Deadlock

  • JDBC Architecture & Establishing DB Connection

  • JavaFX GUI Basics (Stage, Scene, Controls)

⭐ Important

  • Thread Priorities, Inter-thread Communication

  • ResultSet Interface in JDBC

  • Event Handling in JavaFX

🔹 Medium

  • String Methods for Searching & Extracting

  • Deadlock Case Situations

Preparation Strategy for Students:

  1. Focus on Most Important topics for theory + coding questions.

  2. Practice coding for Important topics (especially constructors, inheritance, exception handling, strings, multithreading).

  3. Skim Medium topics for short answers/2-mark questions.

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