Worker Union Support Interview Questions and Answers

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 can be achieved through method overloading or method overriding.

• Example: A shape class can have multiple subclasses like circle, square, etc. and all can be treated as shapes.

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

An interface is a contract that specifies the methods that a class must implement. An abstract class is a class that cannot be instantiated.

• An interface can be implemented by multiple classes.

• An abstract class can have both abstract and non-abstract methods.

• An interface can only have abstract methods.

• An abstract class can have instance variables.

• An interface can be used to achieve multiple inheritance in Java.

• An abstra...read more