Abstract class - Whetehere sub class should implement all the abstract methods of base class ?

[kri shan]

public abstract class Vehicle {

abstract int total();

}


public class Car extends Vehicle {

}


Is it mandatory to implement abstract method total in the sub class Car?

[Bear Bibeault]

No. But if you don't, Car must also be abstract.

[Rob Spoor]

In other words, if the class is not abstract then yes. After all, a non-abstract class can have no abstract methods, even not inherited from an abstract super class.