Collections and Generics - SCJP Sun Certified Programmer for Java Platform SE6 - page 481

11. numbers.add(309L);
12. Iterator iter = numbers.iterator();
13. while(iter.hasNext()) {
14. System.out.print(iter.next());
15. }
Which of the following statements are true? (Select two.)
A. The code compiles successfully.
B. The output is 8675null309.
C. The output is indeterminate.
D. Line 6 generates a compiler error.
E. Line 12 generates a compiler error.
10. What is the result of the following statements?
7. TreeSet<String> tree = new TreeSet<String>();
8. tree.add(“one”);
9. tree.add(“One”);
10. tree.add(“ONE”);
11. System.out.println(tree.ceiling(“On”));
A. one
B. One
C. ONE
D. On
11. Given the following declaration:
Map<String, Double> map = new HashMap<String, Double>();
which of the following statements are valid?
A. map.add(“pi“, 3.14159);
B. map.add(“e“, 2.71828D);
C. map.add(“log(1)“, new Double(0.0));
D. map.add('x', new Double(123.4));
E. None of the above.
12. What is the result of the following program?
import java.util.*;
public class MyComparator implements Comparator<String> {
public int compare(String a, String b) {