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問題 #1

What are two differences between Callable and Runnable?

A. A Callable can throw an Exception when executing, but a Runnable cannot.
B. A Callable can be executed by a ExecutorService, but a Runnable cannot.
C. A Callable can return a value when executing, but a Runnable cannot.
D. A Callable can be passed to a Thread, but a Runnable cannot.

問題 #2

Given:

Which two are true?

A. One new thread of execution is started within the main method.
B. Greeting is printed once.
C. A runtime exception is thrown on line 9.
D. Two new threads of execution are started within the main method.
E. No new threads of execution are started within the main method.
F. Greeting is printed twice.
G. No output is produced.

問題 #3

Given the code fragment:

What is the result when the result.txt file already exists in c:\student?

A. The program replaces the file contents and the file's attributes and prints Equal.
B. The program replaces the file contents as well as the file attributes and prints Not equal.
C. An UnsupportedOperationException is thrown at runtime.
D. The program replaces only the file attributes and prints Not equal.

問題 #4

Given:

Which two statements are true about the writer class?

A. It compiles if the code void write (String s); is added at line***.
B. It compiles if the code void write (string s) { } is added at line ***.
C. It compiles if the code write () {}is added at line ***.
D. It compiles if the code void write (); is added at line ***.
E. It compiles without any changes.

問題 #5

Given:

What is the result of invoking Car's scop method?

A. Vehicles stop method is invoked.
B. Both vehicles and Motorized's stop methods are invoked.
C. The implementation of the Car's stop determines the behavior.
D. Compilation fails.
E. Motorized's stop method is invoked-

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