1Z0-819無料問題集「Oracle Java SE 11 Developer」

質問 1

How many Thing objects are eligible for garbage collection in line 1?

（A）3

（B）1

（C）4

（D）2

（E）0

正解：B 解答を投票する

質問 2

What change will cause the code to compile successfully?

（A）Insert PriceChecker <Plushy extends Products> prod on line 1.

（B）Insert PriceChecker <> prod on line 1.

（C）Insert PriceChecker (?) prod on line 1.

（D）Insert PriceChecker <Electronics> prod on line 1.

正解：C 解答を投票する

質問 3

Given:

What is the result?

（A）234

（B）3241

（C）2134

（D）214

正解：B 解答を投票する

質問 4

Given the code fragment:

You want to display the value of currency as $100.00.
Which code inserted on line 1 will accomplish this?

（A）NumberFormat formatter = NumberFormat.getCurrencyInstance(locale);

（B）NumberFormat formatter = NumberFormat.getCurrency(locale);

（C）NumberFormat formatter = NumberFormat.getInstance(locale).getCurrency();

（D）NumberFormat formatter = NumberFormat.getInstance(locale);

正解：C 解答を投票する

質問 5

Which code fragment compiles?

（A）Option D

（B）Option B

（C）Option C

（D）Option A

正解：A 解答を投票する

解説: (JPNTest メンバーにのみ表示されます)

質問 6

Given the code fragment:

What is the result?

（A）USD -> 1.00
GBP -> 0.75
EUR -> 0.84
CNY -> 6.42

（B）EUR -> 0.84
GBP -> 0.75
USD -> 1.00
CNY -> 6.42

（C）CNY -> 6.42
EUR -> 0.84
GBP -> 0.75
USD -> 1.00

（D）The compilation fails.

正解：D 解答を投票する

解説: (JPNTest メンバーにのみ表示されます)

質問 7

Given:

What is the result?

（A）[A, B, C]
[A, B, C]

（B）On line 9, an exception is thrown at run time.

（C）[A, B, C]
[A, B]

（D）[A, B, C]
followed by an exception thrown on line 11.

正解：A 解答を投票する

解説: (JPNTest メンバーにのみ表示されます)

質問 8

var numbers = List.of(0,1,2,3,4,5,6,7,8,9);
You want to calculate the average of numbers. Which two codes will accomplish this? (Choose two.)

（A）double avg = numbers.parallelStream().mapToInt (m -> m).average().getAsDouble ();

（B）double avg = numbers.stream().mapToInt (i -> i).average().parallel();

（C）double avg = numbers.stream().parallel().averagingDouble(a -> a);

（D）double avg = numbers.stream().collect(Collectors.averagingDouble(n -> n));

（E）double avg = numbers.stream().average().getAsDouble();

正解：A、E 解答を投票する

解説: (JPNTest メンバーにのみ表示されます)

質問 9

Given the code fragment:

What is the result?

（A）The code prints nothing.

（B）0 8 10

（C）0 8

（D）0 4 9

（E）0

正解：C 解答を投票する

解説: (JPNTest メンバーにのみ表示されます)

質問 10

Which two modules include APIs in the Java SE Specification? (Choose two.)

（A）java.desktop

（B）jdk.httpserver

（C）java.logging

（D）jdk.jartool

（E）javafx

正解：B、C 解答を投票する

質問 11

Examine these module declarations:

Which two statements are correct? (Choose two.)

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

（B）The Consumer module should require the ServiceProvider module.

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

（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

正解：A、B 解答を投票する

解説: (JPNTest メンバーにのみ表示されます)

質問 12

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

Which two are true? (Choose two.)

（A）A module providing an implementation of country.CountryDetails can be compiled and added without recompiling the main module.

（B）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.

（C）To run without an error, the application must have at least one module in the module path that provides an implementation of country.CountryDetails.

（D）A module providing an implementation of country.CountryDetails must have a requires main; directive in its module-info.java file.

（E）An implementation of country.countryDetails can be added to the main module.

正解：B、D 解答を投票する

質問 13

Your organization makes mlib.jar available to your cloud customers. While working on a new feature for mlib.jar, you see that the customer visible method public void enableService(String hostName, String portNumber) executes this code fragment

and you see this grant is in the security policy file:

What security vulnerability does this expose to your cloud customer's code?

（A）XML injection attack against any mlib server

（B）denial of service attack against any reachable machine

（C）SQL injection attack against the specified host and port

（D）none because the customer code base must also be granted SocketPermission

（E）privilege escalation attack against the OS running the customer code

正解：C 解答を投票する

質問 14

Given:

Assume the file on path does not exist. What is the result?

（A）/u01/work/filestore.txt is deleted.

（B）Exception

（C）The compilation fails.

（D）/u01/work/filestore.txt is not deleted.

正解：C 解答を投票する

解説: (JPNTest メンバーにのみ表示されます)

1Z0-819 無料問題集「Oracle Java SE 11 Developer」

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