Java Level 2|商業線上App不用買-HotApp4Game

Java Level 2

This level 2 quiz will give you in-depth and thorough understanding of OO concepts. Do you know . . .

• how to look at a program and see its overall structure?

• why main must be static?

• why a variable declared inside or outside a method is conceptually different?

• whether it is correct to say polygon is a class and circle is an object?

• whether a variable has a default value or not depends on its nature?

• what are the implications of adding the modifier static to a variable?

• whether a class will deal with byte or character data stream from its name?

. . . you will learn this and more from the quiz!

Oh yeah, is it also correct to say stationery is a class and pen is an object? How do you tell what is a class and what is an object?

There are 100 questions covering object-oriented concepts, classes and objects, class structure, superclasses, reference types, method calls with reference types, generics,, exceptions, inner classes, graphics, applets, IO streams, serialization, and so on

Coming soon! Level 3 will deal with GUI, polymorphism, software reuse techniques, and other advance stuff. And yes, you may know what an abstract class is. Or an abstract method. But do you know *why* we have such oddities?