2024 JAVA 819 模擬測驗八

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2024 JAVA 819 模擬測驗八

請填寫姓名 *

1.Which code is correct? *

100 points

A. Runnable r = “Message”-> System.out.println();

B. Runnable r = ()- > System.out::print;

C. Runnable r = () -> {System.out.println(“Message”);};

D. Runnable r = > System.out.println(“Message”);

E. Runnable r = {System.out.println(“Message”)};

2.Which annotation should be used to remove warnings from compilation? *

100 points

A. @SuppressWarnings on the main and print methods

B. @SuppressWarnings("unchecked") on main and @SafeVarargs on the print method

C. @SuppressWarnings("rawtypes") on main and @SafeVarargs on the print method

D. @SuppressWarnings("all") on the main and print methods

3.Which code fragment correctly forms a short list of words containing the letter "e"? *

100 points

4.Assuming the source file and destination folder exist, what Is the result? *

100 points

A. A java.nio.file.FileAlreadyExistsException is thrown on line 1.

B. A java.nio.file.NoSuchFileException is thrown on line 2.

C. A copy of /repo/a/a.txt is moved to the /repo directory and /repo/a/a.txt is deleted.

D. a.txt is renamed repo.

5.Which pattern formats the date as Friday 7th of February 1997? *

100 points

A. "eeee dd+"th of"+ MMM yyyy"

B. "eeee dd’th of’ MMM yyyy"

C. "eeee d+"th of"+ MMMM yyyy"

D. "eeee d’th of’ MMMM yyyy"

6.Which code fragment can be inserted into the switch statement to print Best? *

100 points

A. QUALITY.A.ValueOf()

B. A

C. A.toString()

D. QUALITY.A

7.What is the result ?

100 points

A. Orange Juice

B. The compilation fails.

D. The program prints nothing.

Clear selection

8.Which three annotation uses are valid? (Choose three.)

100 points

A. Function<String, String> func = (@NonNull x) -> x.toUpperCase();

B. var v = "Hello" + (@Interned) "World"

C. Function<String, String> func = (var @NonNull x) -> x.toUpperCase();

D. Function<String, String> func = (@NonNull var x) -> x.toUpperCase();

E. var myString = (@NonNull String) str;

F. var obj = new @Interned MyObject();

9.Which two statements correctly describe capabilities of interfaces and abstract classes? (Choose two.)

100 points

A. Interfaces cannot have protected methods but abstract classes can.

B. Both interfaces and abstract classes can have final methods.

C. Interfaces cannot have instance fields but abstract classes can.

D. Interfaces cannot have static methods but abstract classes can.

E. Interfaces cannot have methods with bodies but abstract classes can.

10.Why?

100 points

A. A, because it sends exactly the value of user provided by the calling code.

B. B, because enquoting values provided by the calling code prevents SQL injection.

C. A and B are functionally equivalent.

D. A, because it is unnecessary to enclose identifiers in quotes.

E. B, because all values provided by the calling code should be enquoted.

Clear selection

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