Flashcards

Quiz 3 1302

marc30599 . Inglês 8 flashcards

Flashcards do conjunto (8)

1What are Abstract Classes/Methods?A class or method that is declared with abstract keyword
2How to write abstract class?"public 'abstract' class className"
3What are characteristics of abstract class?Cannot be instantiated
can have constructors
can have non-abstract methods
no restrictions on attributes
&
keywords: "abstract class extends"
4How to write abstract method?"public 'abstract' datatype methodName();"
5What is Polymorphism?The ability of an object to take on many forms, used in implementing inheritance.
6What are Interfaces?It is like a abstract class but only has abstract methods.
7What are characteristics of Interfaces?cannot be instantiated
cannot have constructors
can only have abstract methods
&
attributes MUST be "public static final" keyword interface
8How woud you write a interface named "pluggable" with a method "plugIn" that returns a boolean for whether a device is receiving power from the outlets and has a parameter for the voltage needed as an "int"public interface Pluggable {
public abstract boolean plugIn(int voltage);
}