单项选择题
10. class Nav{
11. public enum Direction { NORTH， SOUTH， EAST， WEST }
12. }
13. public class Sprite{
14. // insert code here
15. }
Which code， inserted at line 14， allows the Sprite class to compile？（）
A. Direction d = NORTH；
B. Nav.Direction d = NORTH；
C. Direction d = Direction.NORTH；
D. Nav.Direction d = Nav.Direction.NORTH；
相关考题
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单项选择题
public class Pass { public static void main（String [1 args） { int x 5； Pass p = new Pass（）； p.doStuff（x）； System.out.print（” main x = “+ x）； } void doStuff（int x） { System.out.print（” doStuff x = “+ x++）； } } What is the result？（）
A. Compilation fails.
B. An exception is thrown at runtime.
C. doStuffx = 6 main x = 6
D. doStuffx = 5 main x = 5
E. doStuffx = 5 main x = 6
F. doStuffx = 6 main x = 5 -
单项选择题
23. Object [] myObjects = { 24. new integer（12）， 25. new String（”foo”）， 26. new integer（5）， 27. new Boolean（true） 28. }； 29. Arrays.sort（myObjects）； 30. for（ int i=0； i31. System.out.print（myObjects[i].toString（））； 32. System.out.print（” “）； 33. } What is the result？（）
A. Compilation fails due to an error in line 23.
B. Compilation fails due to an error in line 29.
C. A ClassCastException occurs in line 29.
D. A ClassCastException occurs in line 31.
E. The value of all four objects prints in natural order. -
单项选择题
public class Person { private name； public Person（String name） { this.name = name； } public int hashCode（） { return 420； } } Which is true？（）
A. The time to find the value from HashMap with a Person key depends on the size of the map.
B. Deleting a Person key from a HashMap will delete all map entries for all keys of typePerson.
C. Inserting a second Person object into a HashSet will cause the first Person object to beremoved as a duplicate.
D. The time to determine whether a Person object is contained in a HashSet is constant and does NOT depend on the size of the map.
