リリースOracle 1Z0-819更新された問題PDF [Q31-Q53]

リリースOracle 1Z0-819更新された問題PDF

1Z0-819問題集と練習テスト（262試験問題)

Oracle 1Z0-819試験を合格するために、候補者は効率的で信頼性の高く保守可能なJavaコードを書く能力、主要なJavaの概念や機能に関する理解を示す必要があります。また、共通のプログラミングエラーやパフォーマンスのボトルネックを特定して修正する能力も必要です。この認定資格は多くの雇用主にとって、Java開発者にとって価値のある証明書として認められており、競争の激しい求人市場で候補者が目立つのを助けることができます。さらに、Javaプログラミングのさらなる専門的な発展における堅固な基盤を提供することができます。

質問 # 31
You replace the code on line 1 to use ParallelStream.

Which one is correct?

A. A NoSuchElementException is thrown at run time.
B. The compilation fails.
C. The code may produce a different result.
D. The code will produce the same result.

正解：C

質問 # 32
Given:

What is the result?

A. The compilation fails.
B. Keys: 4 Values: 4 Map: 0
C. Keys: 0 Values: 0 Map: 0
D. Keys: 4 Values: 4 Map: 4
E. Keys: 0 Values: 0 Map:

正解：D

質問 # 33
Given:

Which two methods modify field values? (Choose two.)

A. setCCount
B. setGCount
C. setACount
D. setAllCounts
E. setTCount

正解：B、D

質問 # 34
Given:

What is the result?

A. b2
B. b3
C. b1
D. 0
E. 1
F. 2
G. The compilation fails due to an error in line 1.

正解：D

解説：

質問 # 35
Given:

Which two are secure serialization of these objects? (Choose two.)

A. Declare fields transient.
B. Implement only readResolve to replace the instance with a serial proxy and not writeReplace.
C. Implement only writeReplace to replace the instance with a serial proxy and not readResolve.
D. Make the class abstract.
E. Define the serialPersistentFields array field.

正解：B、E

質問 # 36
Given an application with a main module that has this module-info.java file:

Which two are true? (Choose two.)

A. An implementation of country.countryDetails can be added to the main module.
B. A module providing an implementation of country.CountryDetails must have a requires main; directive in its module-info.java file.
C. A module providing an implementation of country.CountryDetails can be compiled and added without recompiling the main module.
D. To compile without an error, the application must have at least one module in the module source path that provides an implementation of country.CountryDetails.
E. To run without an error, the application must have at least one module in the module path that provides an implementation of country.CountryDetails.

正解：B、D

質問 # 37
Given:

Which three classes successfully override showFirst ()?
A)

B)

C)

D)

E)

F)

A. Option B
B. Option D
C. Option F
D. Option E
E. Option C
F. Option A

正解：E

質問 # 38
Given:
String originalPath = "data\\projects\\a-project\\..\\..\\another-project"; Path path = Paths.get(originalPath); System.out.print(path.normalize()); What is the result?

A. data\projects\a-project\another-project
B. data\\projects\\a-project\\..\\..\\another-project
C. data\another-project
D. data\projects\a-project\..\..\another-project

正解：D

解説：

質問 # 39
Given:

Which is true?

A. System.in is the standard input stream. The stream is already open.
B. System.out is the standard output stream. The stream is open only when System.out is called.
C. System.in cannot reassign the other stream.
D. System.out is an instance of java.io.OutputStream by default.

正解：A

質問 # 40
Given:

What is the result?

A. 0
B. 1
C. 0 4 9
D. nothing

正解：D

質問 # 41
Given the code fragment:

You want to examine whether path is a directory.
Which code inserted on line 1 will accomplish this?

A. BasicFileAttributes attributes = Files.readAttributes(path, BasicFileAttributes.class
B. BasicFileAttributes attributes =Files.getAttribute (path, ''insdirectory'');
C. BasicFileAttributes attributes = Files, readAttributes (path, FileAttributes, class);
D. BasicFileAttributes attributes = Files isDirectory (path);

正解：C

質問 # 42
Given the declaration:

Examine this code fragment:
/* Loc1 */ class ProcessOrders { ... }
Which two annotations may be applied at Loc1 in the code fragment? (Choose two.)

A. @Resource(priority=100)
B. @Resource(name="Customer1")
C. @Resource(priority=0)
D. @Resource(name="Customer1", priority=100)
E. @Resource

正解：A、C

質問 # 43
Given:

What is the result?

A. nullnull
B. JoeMarry
C. nullMary
D. Joenull

正解：C

解説：

質問 # 44
Given:

Which statement is true about the Fox class?

A. Fox class does not have to override the inhabit method if Forest and Town provide compatible implementations.
B. Fox class must provide implementation for the inhabit method.
C. Fox class must implement either Forest or Town interfaces, but not both.
D. Fox class does not have to override inhabit method, so long as it does not try to call it.
E. The inhabit method implementation from the first interface that Fox implements will take precedence.

正解：A

質問 # 45
Given the declaration:

Examine this code fragment:
/* Loc1 */ class ProcessOrders { ... }
Which two annotations may be applied at Loc1 in the code fragment? (Choose two.)

A. @Resource(priority=100)
B. @Resource(name="Customer1")
C. @Resource(priority=0)
D. @Resource(name="Customer1", priority=100)
E. @Resource

正解：A、C

質問 # 46
Given:

Which code fragment on line 1 makes the m map contain the employee with the highest salary for each neighborhood?
A)

B)

C)

D)

A. Option B
B. Option C
C. Option D
D. Option A

正解：C

質問 # 47
Given the code fragment:

What is the result?

A. The compilation fails at line 16.
B. 0
C. The compilation fails at line
D. The compilation fails at line 13.
E. 1

正解：B

質問 # 48
Given the code fragment:

What is the result?

A. 13 5 7 9
B. 1 3 5 7 9 11
C. 2 4 6 B 10
D. 2 4 6 8

正解：B

質問 # 49
Given:

What is the result?

A. 0
B. 1
C. 2
D. 3

正解：C

解説：

質問 # 50
Given:

You want to calculate the average of the Player's score.
Which statement inserted on line 1 will accomplish this?

A. players.stream().mapToInt(a -> a.score).average().orElse(0.0);
B. players.stream().average().orElse(0.0);
C. players.stream().mapToDouble(a -> a.score).average();
D. players.stream().map(a -> a.score).average();

正解：A

質問 # 51
Given:

Which two are correct? (Choose two.)

A. The output will be exactly 2 1 3 4 5.
B. Replacing forEach() with forEachOrdered(), the program prints 2 1 3 4 5.
C. The program prints 1 4 2 3, but the order is unpredictable.
D. Replacing forEach() with forEachOrdered(), the program prints 1 2 3 4 5.
E. Replacing forEach() with forEachOrdered(), the program prints 2 1 3 4 5, but the order is unpredictable.

正解：C、D

解説：