Which two CANNOT directly cause a thread to stop executing？（）

A. Calling the yield method.
B. Calling the wait method on an object.
C. Calling the notify method on an object.
D. Calling the notifyAll method on an object.
E. Calling the start method on another Thread object.

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单项选择题

Which statement is true？（）

A. If only one thread is blocked in the wait method of an object， and another thread executes the modify on that same object， then the first thread immediately resumes execution.
B. If a thread is blocked in the wait method of an object， and another thread executes the notify method on the same object， it is still possible that the first thread might never resume execution.
C. If a thread is blocked in the wait method of an object， and another thread executes the notify method on the same object， then the first thread definitely resumes execution as a direct and sole consequence of the notify call.
D. If two threads are blocked in the wait method of one object， and another thread executes the notify method on the same object， then the first thread that executed the wait call first definitely resumes execution as a direct and sole consequence of the notify call.

单项选择题

public class Foo implements Runnable （
public void run （Thread t） {
system.out.printIn（“Running.”）；
}
public static void main （String[] args） {
new thread （new Foo（））.start（）；
}
）
What is the result？（）

A. An exception is thrown.
B. The program exists without printing anything.
C. An error at line 1 causes compilation to fail.
D. An error at line 2 causes the compilation to fail.
E. “Running” is printed and the program exits.

填空题

1. public class test {
2. public static string output = “”
3.
4. public static void foo（int i） {
5. try {
6. if（i= =1） {
7. throw new Exception （）；
8. }
9. output += “1”；
10.}
11. catch（Exception e） {
12. output += “2”；
13. return；
14.}
15. finally （
16. output += “3”；
17. ）
18. output += “4”；
19. }
20.
21. public static void main （string args[]）（
22. foo（0）；
23. foo（1）；
24.
25. ）
26. }
What is the value of the variable output at line 24？（）

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