1. In Java, which technique can be implemented using the private access specifier? a. Constructor Collection b. Encapsulation c. Garbage Collection d. None of the above. 2. In Java, which of the following allow us to define an IS-A relationship? a. A class b. An interface c. a. and b. d. None of the above. 3. Some graduate students updated the algorithm used by the submit server and now testing a project takes 40% less time than before. We don't know what the students did, only that testing takes less time now. This scenario is an example of? a. Data Abstraction b. Procedural Abstraction c. Efficient TA Execution d. None of the above 4. Which of the following allow us to avoid code duplication?

a. Auxiliary(private) methods that several methods rely on. b. Inheritance c. a. and b. d. Garbage Collection e. None of the above. 5. In Java, a class can: a. Extend only one class, and implement multiple interfaces. b. Extend more than one class and implement multiple interfaces. c. Extend only one class and implement only one interface. d. None of the above. 6. Class A compiles, and has a single constructor that takes a string as parameter. Class B extends class A. If "super()" is the first statement in the constructor of class B, then: a. B's constructor will compile. b. We need to define a default constructor in class A in order for B's constructor to compile. c. We need to remove the "super()" from the class B's constructor for it to compile. d. None of the above.

7. The Programmer class defines a method named "implement" that has the following prototype: protected String implement(int linesOfCode); The JavaProgrammer class extends the Programmer class. Which of the following is the prototype of a method in the JavaProgrammer class that OVERRIDES the "implement" method of the Programmer class? a. public String implement(int linesOfCode); b. private String implement(int linesOfCode); c. public String implement(); d. a. and b. e. a. and c. 8. This question relies on the same information as the previous one. The Programmer class defines a method named "implement" that has the following prototype: protected String implement(int linesOfCode); The JavaProgrammer class extends the Programmer class. Which of the following is the prototype of a method in the JavaProgrammer class that OVERLOADS (not OVERRIDES as in the previous question) the "implement" method of the Programmer class? a. public String implement(int linesOfCode); b. private String implement(int linesOfCode); c. public String implement(); d. a. and b. e. a. and c. 9. We can tell whether two objects belong EXACTLY to the same class by using: a. The instanceof operator. b. The getClass() method. c. a. or b. d. None of the above. 10. Class A defines a method called clear(). Class B, extends class A and provides a method clear() (it has the same prototype as the one in class A). Which clear() method will be called in the following code fragment if we assume early/static binding is being used? You can assume A and B have default constructors. A obj = new B(); obj.clear(); a. The clear() method of class A. b. The clear() method of class B. c. The clear() method in the Object class. d. None of the above. 11. Class A is an abstract class with a single abstract method called analyze(). Class B extends class A, only defines a single non-abstract method called task(), and does not provide an implementation for analyze(). Which of the following are true? a. Class B will compile whether it is defined abstract or not. b. Class B must be defined abstract, otherwise the code will not compile. c. We can create instances of B, but not of A. d. None of the above. 12. The average(int x) method in a class called "Tools" performs a special average computation. We would like classes extending the "Tools" class to use the method, but not to change the computation the method does. How should the average method be defined in order to provide this guarantee? a. The method should be defined as protected. b. The method should be defined as static. c. The method should be defined as final. d. None of the above. 13. The method sum() is called in the linearize() method. If sum() can throw a checked exception, then: public void linearize() { sum(); }

a. The above linearize() method will compile. b. The above linearize() method will not compile. c. None of the above. 14. A set of tests generate 90% test coverage for a piece of code. This means that: a. 90% of the code has no bugs and 10% has bugs. b. 90% of the code has no bugs and 10% may or may not have bugs. c. 90% of the code has bugs and 10% has no bugs. d. None of the above. 15. Class A is an immutable class. If we have an array of references to objects of type A, which copying process will allow us to have an array copy where changes to any component of the array will not affect the original? We need the most efficient copying process.

a. Deep copy, where the array and each of the objects the array refers to are duplicated. b. Shallow copy, where only the array is duplicated, but references to the objects are shared between the two arrays. c. Reference copy, where we only make a copy of the address that points to the original array object. d. None of the above. 16. In the expression a.separate(b), a and b are reference variables of the same type. Inside of the separate method, which object is associated with the current object reference ("this")? a. The same object associated with a. b. The same object associated with b. c. There is no object associated with "this". d. None of the above. 17. A Car class does not define an equals method (one that returns a boolean and has an Object reference parameter). If a and b are Car references, a.equals(b) is equivalent to: a. a == b b. a != b c. a < b d. None of the above.

17 MultipleChoice please, upvote for get 80% correct or higher, thanks!