Collections and Generics - SCJP Sun Certified Programmer for Java Platform SE6 - page 480

C. hellohiola
D. hihello
E. The code does not compile.
7. Which of the following statements are valid? (Choose three.)
A. List<String> list = new Vector<String>();
B. HashSet<Number> hs = new HashSet<Integer>();
C. Map<String, ? extends Number> hm = new HashMap<String, Integer>();
D. HashSet<? super ClassCastException> set = new HashSet<Exception>();
E. List<Object> values = new LinkedHashSet<Object> ();
8. What is the result of the following program?
1. public class Hello<T> {
2. T t;
3.
4. public Hello(T t) {
5. this.t = t;
6. }
7.
8. public String toString() {
9. return t.toString();
10. }
11.
12. public static void main(String [] args) {
13. System.out.print(new Hello<String>(“hi”));
14. System.out.print(new Hello(“there”));
15. }
16. }
A. hi
B. hi followed by a runtime exception
C. hithere
D. Compiler error on line 9
E. Compiler error on line 14
9. Given the following statements:
6. Set<Number> numbers = new HashSet<Number>();
7. numbers.add(new Integer(86));
8. numbers.add(75);
9. numbers.add(new Integer(86));
10. numbers.add(null);