Trainee Quality Engineer Interview Questions and Answers for Freshers

Polymorphism is the ability of an object to take on many forms.

• Polymorphism allows objects of different classes to be treated as if they are of the same class.

• It is achieved through method overriding and method overloading.

• Examples include function overloading, operator overloading, and inheritance.

• Polymorphism helps in achieving loose coupling and flexibility in code design.

Abstraction is the process of simplifying complex systems by focusing on essential details.

• Abstraction involves hiding unnecessary details and focusing on important ones.

• It helps in reducing complexity and making systems easier to understand and use.

• Examples of abstraction include programming languages, where complex code is abstracted into simpler functions and classes.

• Another example is a car dashboard, which abstracts the complex workings of the car into simple indicators ...read more

In Java, there are 4 types of inheritance: Single, Multilevel, Hierarchical, and Multiple.

• Single inheritance involves one class inheriting from another class.

• Multilevel inheritance involves a class inheriting from a class that has already inherited from another class.

• Hierarchical inheritance involves multiple classes inheriting from a single class.

• Multiple inheritance involves a class inheriting from multiple classes, which is not supported in Java.