Java Core Class (Type, File)

3. Classloader (Hierarchy: Bootstrap, Extensions, System, User-defined…)

1. What is the mechanism of classloading?

2. Default hierarchy of classloaders.

3. What is the role of every element in hierarchy?

4. Why don’t use only one or two classloaders?

5. Life cycle of a ‘class’ when it loads by classloaders.

6. Stages of class construction.

7. User-defined classloader. Why and when we need it? Best practice.

8. Library Version Conflicts and how classloaders resolve it.

9. A possibility to load different version of the same libs.

10. Types of Exceptions are thrown by classloading mechanism.

4. Abstraction

1. What is it Abstraction?

2. Maintaining/ Achieving abstraction in java, best practice.

5. Polymorphism

1. Description of the essence of the idea.

2. What are the types of it?

3. Implementation and support ‘Polymorphism’ in Java.

4. Polymorphism and data members in Java.

5. Overloading and overriding methods.

6. What is run time and compile time polymorphism?

7. Polymorphism and best practice in Java.

8. Possibility to override of overload static methods in Java.

6. Inheritance

1. What is inheritance?

2. Inheritance in java, supported types.

3. Ways to use inheritance in java.

4. Difference between inheritance and abstraction.

5. Polymorphism and inheritance differences.

6. Composition vs inheritance.