1Z0-819 Free Practice Test

Given:
public class X {
}
and
public final class Y extends X {
}
What is the result of compiling these two classes?

1. A. The compilation fails because there is no zero args constructor defined in class X.
2. B. The compilation fails because either class X or class Y needs to implement the toString() method.
3. C. The compilation fails because a final class cannot extend another class.
4. D. The compilation succeeds.

Correct Answer: B

Given:

When is the readObject method called?

1. A. before this object is deserialized
2. B. after this object is deserialized
3. C. before this object Is serialized
4. D. The method is never called.
5. E. after this object is serialized

Correct Answer: B

Which two statements independently compile? (Choose two.)

1. A. List<? super Short> list = new ArrayList<Number>();
2. B. List<? super Number> list = new ArrayList();
3. C. List<? extends Number> list = new ArrayList();
4. D. List<? extends Number> list = new ArrayList<Object>();
5. E. List<? super Float> list = new ArrayList();

Correct Answer: AC