Week 3 Class Activity

Activity 1

Implement the abstract Calculable class below:

Calculable

+plus(that: Calculable): Calculable +minus(that: Calculable): Calculable +doubleValue(): double +intValue(): int

Activity 2

Implement a concrete Double class that extends the Calculable class.

Activity 3

Implement a concrete Integer class that extends the Calculable class.

Activity 4

Modify the Complex class (see Putting it All Together section) so that the following is possible:

Calculable c = new Complex(3, 2);

Activity 5

Should Calculable be an interface instead of an abstract class?