Java OOP: Object Oriented Programming with Exercises - 2025

• Definition and explanation of a class in Java

• Creating a class and understanding its structure

• Fields

• Methods

This quiz covers the essential concepts of classes in Java, focusing on class definitions, fields, methods, and initialization techniques.

• Definition and explanation of an object in Java

• Creating an object from a class

• Understanding the relationship between classes and objects

• Using the dot operator to access object methods and variables

• Understanding the difference between an object's reference and its value

This quiz covers the essential concepts of objects in Java, focusing on object creation, the relationship between classes and objects, constructors, and accessing object fields.

• 'static' keyword

• Access modifiers

• Initialization blocks

• Nested classes

• Getters and setters

This quiz covers advanced concepts of classes and objects in Java, including the use of the static keyword, access modifiers, initialization blocks, nested classes, and getters and setters.

• Definition and explanation of constructors in Java

• Types of constructors: default and parameterized

• 'this' keyword

• How constructors are used when creating objects

This quiz covers the essential concepts of constructors in Java, focusing on their definition, usage, types, overloading, and chaining.

• Overview of interfaces in Java

• Defining an interface

• Implementing an interface

• Extending an interface

• Default and static methods in interfaces

This quiz covers the essential concepts of interfaces in Java, focusing on their definition, implementation, multiple inheritance, default methods, and static methods.

• Overview of abstract classes in Java

• Defining an abstract class

• Extending an abstract class

• Abstract methods and concrete methods

• Abstract classes vs concrete classes

This quiz covers the essential concepts of abstract classes in Java, focusing on their definition, usage, and the differences between abstract and concrete methods.

• Differences between interfaces and abstract classes

• When to use interfaces and when to use abstract classes

• Extending an abstract class and implementing an interface

• Differences between "implements" and "extends"

This quiz covers the essential concepts of combining interfaces and abstract classes in Java, focusing on their differences, usage, and the implementation of both in a single class.

• Definition and explanation of inheritance in OOP

• Examples of inheritance in real-world scenarios

• How inheritance allows for code reuse and organization

• Extending classes in Java

• Understanding the relationship between parent and child classes

• Overriding methods in child classes

• Understanding the use of the "super" keyword

• Understanding the "is-a" relationship in inheritance

This quiz covers the essential concepts of inheritance in Java, focusing on class hierarchies, method overriding, the super keyword, and access control.

• Definition and explanation of polymorphism in OOP

• How polymorphism allows for flexibility and dynamic behavior in code

• Understanding the difference between overloading and overriding methods

• Examples of polymorphism in use, such as with the "instanceof" operator

This quiz covers the essential concepts of polymorphism in Java, focusing on method overloading, method overriding, the instanceof operator, and dynamic dispatch.

• Understanding the use of the "final" keyword in classes and methods

• Understanding the use of the "protected" access modifier

• Understanding the difference between "composition" and "inheritance"

• Understanding the use of inner classes and anonymous classes in polymorphism

• Understanding the use of typecasting and downcasting

This quiz covers advanced concepts of inheritance and polymorphism in Java, focusing on the final keyword, protected access modifier, composition vs inheritance, inner and anonymous classes, typecasting, and downcasting.

• Definition of Encapsulation

• Explanation of how encapsulation works

• Explanation of public, private, protected and default access modifiers

• Use of access modifiers in classes, methods and variables

• Code examples of encapsulation in practice

This quiz covers the essential concepts of encapsulation in Java, focusing on access modifiers, getter and setter methods, and the benefits of encapsulation in software development.

• Explanation of the acronym SOLID and its meaning

• Definition and explanation of the Single Responsibility Principle

• Definition and explanation of the Open-Closed Principle

• Definition and explanation of the Liskov Substitution Principle

• Definition and explanation of the Interface Segregation Principle

• Definition and explanation of the Dependency Inversion Principle

This quiz covers the essential concepts of the SOLID principles in Java, focusing on each principle's definition, benefits, and application in software development.