2022 JAVA 819模擬測驗十三

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2022 JAVA 819模擬測驗十三

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1.What does executing this code fragment do? *

100 points

A. inserts two rows (101, ‘SMITH’, ‘HR’) and (102, ‘JONES’, NULL)

B. inserts two rows (101, ‘SMITH’, ‘HR’) and (102, ‘JONES’, ‘HR’)

C. inserts one row (101, ‘SMITH’, ‘HR’)

D. throws a SQLException

2.Which two statements, independently, would allow this code to compile? (Choose two.) *

100 points

A. Replace line 5 with widgetStream.filter(a -> ((Widget)a).getPrice() > 20.00).

B. Replace line 1 with List<Widget> widgetStream = widgets.stream();.

C. Replace line 5 with widgetStream.filter((Widget a) -> a.getPrice() > 20.00).

D. Replace line 4 with Stream<Widget> widgetStream = widgets.stream();.

Required

3.Which two statements are correct? (Choose two.) *

100 points

A. The ServiceProvider module is the only module that, at run time, can provide the com.example.api API.

B. The placement of the com.example.api API in a separate module, ServiceAPI, makes it easy to install multiple provider modules.

C. The Consumer module should require the ServiceProvider module.

D. The ServiceProvider module should export the com.myimpl package.

E. The ServiceProvider module does not know the identity of a module (such as Consumer) that uses the com.example.api API.

Required

4.Which method can be added to meet these requirements? *

100 points

5.Which one is correct? *

100 points

A. An IllegalThreadStateException is thrown at run time.

B. Three threads are created.

C. The compilation fails.

D. Four threads are created.

6.Which describes the fragment? *

100 points

A. It throws IllegalMonitorStateException.

B. It is subject to deadlock.

C. It is subject to livelock.

D. The code does not compile.

7.What is the result?

100 points

A. /scratch/exam/new.txt and /scratch/new.txt are deleted.

B. The program throws a FileaAlreadyExistsException.

C. The program throws a NoSuchFileException.

D. A copy of /scratch/exam/new.txt exists in the /scratch directory and /scratch/exam/new.txt is deleted.

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8.What is required to make the Foo class thread safe?

100 points

A. No change is required.

B. Make the declaration of lock static.

C. Replace the lock constructor call with new ReentrantLock (true).

D. Move the declaration of lock inside the foo method.

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9.Which statement on line 1 enables this code to compile?

100 points

A. Function<Integer, Integer> f = n -> n * 2;

B. Function<Integer> f = n -> n * 2;

C. Function<int> f = n -> n * 2;

D. Function<int, int> f = n -> n * 2;

E. Function f = n -> n * 2;

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10.Which statement will accomplish this?

100 points

A. String result = fruits.stream().filter(f -> f.contains("n")).findAny();

B. fruits.stream().filter(f -> f.contains("n")).forEachOrdered(System.out::print);

C. Optional<String> result = fruits.stream().filter(f -> f.contains("n")).findFirst ();

D. Optional<String> result = fruits.stream().anyMatch(f -> f.contains("n"));

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