OCPChapter1 REVIEW

Question 1

What is overriding?

Answer 1

Same method name but same parameter lists

Question 2

What is overloading

Answer 2

Same method name but different parameter list like type/numbers

Question 3

Can you have the static word to override? Why or why not?

Answer 3

nope. because if you have the static then the method will be hidden

Question 4

What are the three ways that you can fill the blank codes: 
abstract class Cat
{

}
class Lion extends Cat
{
 void clean(){}
}

Answer 4

1. empty (like what)
2. abstract void clean{}
3. void clean(){}

Empty cause the abstract class is not required to have any methods in it

Question 5

Can a class be both abstract and final?

Answer 5

nope. Because abstract classes is made to be subclassed. but final cannot be subclassed so it defeats the purpose.

Question 6

Page 7 pattern not detected

Answer 6

what import question pa

Question 7

Page 7 pattern not detected

Answer 7

what import question pa

Question 8

All java classes inherit from what?

Answer 8

the Object.

Question 9

Explain why this happens:
HeavyAnimal hippo = new Hippo();
boolean b4= hippo instanceof Object; 
Why is this true?
so if you do null??

Answer 9

because that is an object and unless it is null.

It will be false

Question 10

What is annotation?

Answer 10

provides extra information about the pgram and it is a type of metadata and used by the compiler and even at runtime
@Override and then u overload then give compile error and you as a programmer will be able to fix it

Question 11

What is toString() used for?

Answer 11

print an object.