Arrays

Question 1

What are Arrays of objects initialized to?

Answer 1

Null.

This is not the same as nothing.

Question 2

Can a superclass reference be assigned to a subclass reference variable?

Answer 2

Yes, but only if it is derived from the superclass. Even then it needs a cast.

Question 3

Can you put array size information on the left hand side of an asignment operator?

char foo[2][1] = new char [ ] [ ] { {‘b’, ‘a’}, {‘r’} };

Answer 3

Good God, no.

Question 4

Can an array of Objects hold an array of integers?

Object [ ] o = new int [10];

Answer 4

No, of course not.

Question 5

Is an array of integers an Object?

Object obj = new int [ ] { 1, 2, 3 };

Answer 5

Why yes, it is.

Question 6

What will the isArray( ) method of an array class return?

Answer 6

True.