1. Which among the following statements are valid for a Java abstract class?
[ ] A1.1 - Can contain abstract methods
[ ] A1.2 - Can contain abstract attributes
[ ] A1.3 - All contained method must be abstract
[ ] A1.4 - Can be instantiated as a normal class
[ ] A1.5 - Cannot be instantiated


2. What is the purpose of the operator `<>`?
[ ] A2.1 - define a conditional expression
[ ] A2.2 - define a reverse assignment
[ ] A2.3 - define generic parameters using type inference
[ ] A2.4 - define *method reference*
[ ] A2.5 - extend a class

3. What can be demonstrated with tests?
[ ] A3.1 - Program quality
[ ] A3.2 - Absence of defects
[ ] A3.3 - Maintainability of program
[ ] A3.4 - Presence of defects
[ ] A3.5 - Complexity of program

4. What is included in the top section of a UML class?
[ ] A4.1 - Name of the class
[ ] A4.2 - Implementation
[ ] A4.3 - Interface
[ ] A4.4 - Methods
[ ] A4.5 - Attributes

To select an answer place a "X" in the "[ ]" --> "[X]"