JAVA-Daily-Tasks

Day 12 - OOP Advanced

Introduction

Day 12 focuses on advanced Object-Oriented Programming concepts in Java. The practice programs cover inheritance, method overriding, the super keyword, abstract classes, interfaces, and polymorphism.

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Objectives

• Understand inheritance
• Practice different types of inheritance
• Understand method overriding
• Learn the super keyword
• Understand abstract classes and methods
• Learn interfaces
• Understand multiple interfaces
• Practice runtime polymorphism

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Topics Covered

• Single Inheritance
• Multilevel Inheritance
• Hierarchical Inheritance
• Method Overriding
• super Keyword
• Abstract Class
• Abstract Method
• Interface
• Multiple Interfaces
• Polymorphism

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Folder Structure

Day-12-OOP-Advanced/
│
├── Questions/
│   └── Questions.txt
│
├── Solutions/
│   ├── Q01_Single_Inheritance.java
│   ├── Q02_Multilevel_Inheritance.java
│   ├── Q03_Hierarchical_Inheritance.java
│   ├── Q04_Method_Overriding.java
│   ├── Q05_Super_Keyword.java
│   ├── Q06_Abstract_Class.java
│   ├── Q07_Abstract_Method.java
│   ├── Q08_Interface.java
│   ├── Q09_Interface_Multiple_Inheritance.java
│   └── Q10_Polymorphism.java
│
├── Screenshots/
│   ├── Output_1.png
│   ├── Output_2.png
│   ├── Output_3.png
│   ├── Output_4.png
│   ├── Output_5.png
│   ├── Output_6.png
│   ├── Output_7.png
│   ├── Output_8.png
│   ├── Output_9.png
│   └── Output_10.png
│
└── README.md

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Practice Questions

Q01 - Single Inheritance

Create a parent Animal class and a child Dog class using inheritance.
Solution: Q01_Single_Inheritance.java
Output:

Q02 - Multilevel Inheritance

Implement inheritance through Animal, Dog, and Puppy classes.
Solution: Q02_Multilevel_Inheritance.java
Output:

Q03 - Hierarchical Inheritance

Implement multiple child classes using a common parent class.
Solution: Q03_Hierarchical_Inheritance.java
Output:

Q04 - Method Overriding

Implement method overriding using parent and child classes.
Solution: Q04_Method_Overriding.java
Output:

Q05 - Super Keyword

Use the super keyword to access a parent class variable.
Solution: Q05_Super_Keyword.java
Output:

Q06 - Abstract Class

Create an abstract class and implement its abstract method.
Solution: Q06_Abstract_Class.java
Output:

Q07 - Abstract Method

Implement an abstract method in a child class.
Solution: Q07_Abstract_Method.java
Output:

Q08 - Interface

Create and implement a Java interface.
Solution: Q08_Interface.java
Output:

Q09 - Multiple Interfaces

Implement two interfaces in a single class.
Solution: Q09_Interface_Multiple_Inheritance.java
Output:

Q10 - Polymorphism

Implement runtime polymorphism using parent class references.
Solution: Q10_Polymorphism.java
Output:

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How to Compile and Run

Open PowerShell and go to the Solutions folder:

cd "C:\Disk D\Full Stack fol\JAVA-Daily-Tasks\Day-12-OOP-Advanced\Solutions"

Compile all Java programs:

javac *.java

Run the programs individually:

java Q01_Single_Inheritance
java Q02_Multilevel_Inheritance
java Q03_Hierarchical_Inheritance
java Q04_Method_Overriding
java Q05_Super_Keyword
java Q06_Abstract_Class
java Q07_Abstract_Method
java Q08_Interface
java Q09_Interface_Multiple_Inheritance
java Q10_Polymorphism

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Solutions

No.	Topic	Solution
Q01	Single Inheritance	Q01_Single_Inheritance.java
Q02	Multilevel Inheritance	Q02_Multilevel_Inheritance.java
Q03	Hierarchical Inheritance	Q03_Hierarchical_Inheritance.java
Q04	Method Overriding	Q04_Method_Overriding.java
Q05	Super Keyword	Q05_Super_Keyword.java
Q06	Abstract Class	Q06_Abstract_Class.java
Q07	Abstract Method	Q07_Abstract_Method.java
Q08	Interface	Q08_Interface.java
Q09	Multiple Interfaces	Q09_Interface_Multiple_Inheritance.java
Q10	Polymorphism	Q10_Polymorphism.java

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Key Learning

Through these programs, I practiced:

• Inheritance
• Method overriding
• super keyword
• Abstract classes
• Abstract methods
• Interfaces
• Multiple interfaces
• Runtime polymorphism
• Object-oriented design

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Technologies Used

• Java
• VS Code
• Git
• GitHub

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Progress

Day	Topic	Status
Day 01	Java Basics	Completed
Day 02	Conditional Statements	Completed
Day 03	Real-World Conditions	Completed
Day 04	Loops	Completed
Day 05	Number Programs	Completed
Day 06	Pattern Programs	Completed
Day 07	Arrays Basics	Completed
Day 08	Arrays Problem Solving	Completed
Day 09	String Basics	Completed
Day 10	Methods	Completed
Day 11	OOP Basics	Completed
Day 12	OOP Advanced	Completed

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Learning Goal

The goal of this daily Java practice is to strengthen Java fundamentals, Object-Oriented Programming concepts, logical thinking, problem-solving skills, and technical interview preparation.

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Status

Day 12 - OOP Advanced → Completed ✅

Next: Day 13 - Collections