單項(xiàng)選擇題

11. class Snoochy {
12. Boochybooch；
13. public Snoochy（） { booch = new Boochy（this）； }
14. }
15.
16. class Boochy {
17. Snoochy snooch；
18. public Boochy（Snoochy s） { snooch = s； }
19. }
And the statements：
21. public static void main（String[] args） {
22. Snoochy snoog = new Snoochy（）；
23. snoog = null；
24. // more code here
25. }
Which statement is true about the objects referenced by snoog， snooch， and booch immediately after line 23 executes？（）

A. None of these objects are eligible for garbage collection.
B. Only the object referenced by booch is eligible for garbage collection.
C. Only the object referenced by snoog is eligible for garbage collection.
D. Only the object referenced by snooch is eligible for garbage collection.
E. The objects referenced by snooch and booch are eligible for garbage collection.

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單項(xiàng)選擇題

11. rbo = new ReallyBigObject（）；
12. // more code here
13. rbo = null；
14. /* insert code here */
Which statement should be placed at line 14 to suggest that the virtual machine expend effort toward recycling the memory used by the object rbo？（）

A. System.gc（）；
B. Runtime.gc（）；
C. System.freeMemory（）；
D. Runtime.getRuntime（）.growHeap（）；
E. Runtime.getRuntime（）.freeMemory（）；

單項(xiàng)選擇題

11. public void genNumbers（） {
12. ArrayList numbers = new ArrayList（）；
13. for （int i=0； i<10； i++） {
14. int value = i * （（int） Math.random（））；
15. Integer intObj = new Integer（value）；
16. numbers.add（intObj）；
17. }
18. System.out.println（numbers）；
19. }
Which line of code marks the earliest point that an object referenced by intObj becomes a candidate for garbage collection？（）

A. Line 16
B. Line 17
C. Line 18
D. Line 19
E. The object is NOT a candidate for garbage collection.

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11. rbo = new ReallyBigObject（）； 12. // more code here 13. rbo = null； 14. /* insert code here */ Which statement should be placed at line 14 to suggest that the virtual machine expend effort toward recycling the memory used by the object rbo？（）

11. rbo = new ReallyBigObject（）；
12. // more code here
13. rbo = null；
14. /* insert code here */
Which statement should be placed at line 14 to suggest that the virtual machine expend effort toward recycling the memory used by the object rbo？（）