单项选择题
A. put Poker.jar in directory /stuff/java， and set the CLASSPATH to include /stuff/java
B. put Poker.jar in directory /stuff/java， and set the CLASSPATH to include /stuff/java/*.jar
C. Put Poker.jar in directory /stuff/java， and set the CLASSPATH to include /stuff/java/Poker.jar
D. put Poker.jar in directory /stuff/java/games/cards， and set the CLASSPATH to include /stuff/java
E. put Poker.jar in directory /stuff/java/games/cards， and set the CLASSPATH to include /stuffijava/*.jar
F. put Poker.jar in directory /stuff/java/games/cards， and set the CLASSPATH to include /stuff/java/Poker.jar
单项选择题 1. public class GC { 2. private Object o； 3. private void doSomethingElse（Object obj） { o = obj； } 4. public void doSomething（） { 5. Object o = new Object（）； 6. doSomethingElse（o）； 7. o = new Object（）； 8. doSomethingElse（null）； 9.o=null； 10. } 11. } When the doSomething method is called， after which line does the Object created in line 5 become available for garbage collection？（）
单项选择题 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？（）
单项选择题 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？（）