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

質問 1

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

（A）Interfaces cannot have methods with bodies but abstract classes can.

（B）Interfaces cannot have instance fields but abstract classes can.

（C）Interfaces cannot have protected methods but abstract classes can.

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

（E）Both interfaces and abstract classes can have final methods.

正解：B、C 解答を投票する

質問 2

Given:

And the command:
java Main Helloworld
What is the result ?

（A）Input: Helloworld Echo: Helloworld

（B）Input:
Echo: Helloworld

（C）Input: Echo:

（D）Input:
Then block until any input comes from System.in.

（E）A NullPointerException is thrown at run time.

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 3

Which code fragment does a service use to load the service provider with a Print interface?

（A）private java.util.ServiceLoader<Print> loader = ServiceLoader.load (Print.class);

（B）private Print print = com.service.Provider.getInstance();

（C）private java.util.ServiceLoader<Print> loader = new java.util.ServiceLoader<> ();

（D）private Print print = new com.service.Provider.PrintImpl();

正解：A 解答を投票する

質問 4

Given the code fragment:

What is the result?

（A）2 4 6 8 10

（B）1 3 5 7 9

（C）2 4 6 8

（D）1 3 5 7 9 11

正解：B 解答を投票する

質問 5

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 6

Which module-info.java is correct for a service provider for a print service defined in the PrintServiceAPI module?

（A）module PrintServiceProvider {
requires PrintServiceAPI;
exports org.printservice.spi.Print with
D18912E1457D5D1DDCBD40AB3BF70D5D
com.provider.PrintService;
}

（B）module PrintServiceProvider {
requires PrintServiceAPI;
exports org.printservice.spi;
}

（C）module PrintServiceProvider {
requires PrintServiceAPI;
provides org.printservice.spi.Print with
com.provider.PrintService;
}

（D）module PrintServiceProvider {
requires PrintServiceAPI;
uses com.provider.PrintService;
}

正解：B 解答を投票する

質問 7

Given:

executed using command:
java Hello "Hello World" Hello World
What is the output?

（A）Hello WorldHelloWorld

（B）Hello WorldHello World

（C）HelloHello WorldHelloWorld

（D）Hello World Hello World

（E）An exception is thrown at runtime.

正解：D 解答を投票する

質問 8

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 9

Given these two classes:

And given this fragment:

Which describes the fragment?

（A）It is subject to deadlock.

（B）It is subject to livelock.

（C）The code does not compile.

（D）It throws IllegalMonitorStateException.

正解：C 解答を投票する

質問 10

Given the code fragment:
Which two code snippets inserted independently inside println method print Mondial:domainmodel? (Choose two.)

（A）new Main().prefix + new Main().name

（B）prefix + getName

（C）Main.prefix + Main.name

（D）prefix + Main.name

（E）Main.prefix + Main.getName()

（F）prefix + name

正解：B、E 解答を投票する

質問 11

Given:

What is the result?

（A）6=(x+y)=42

（B）6=(x+y)=6

（C）42=(x+y)=6

（D）42=(x+y)=42

（E）An exception is thrown at runtime.

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 12

Analyze the code:

Which two options can you insert inside println method to produce Global:namescope? (Choose two.)

（A）Test.prefix+Test.name

（B）new Test().prefix+new Test().name

（C）Test.prefix+Test.getName()

（D）prefix+Test.name

（E）prefix+name

（F）Test.getName+prefix

正解：B、C 解答を投票する

質問 13

Given this requirement:
Module vehicle depends on module part and makes its com.vehicle package available for all other modules.
Which module-info.java declaration meets the requirement?

（A）Option D

（B）Option B

（C）Option C

（D）Option A

正解：D 解答を投票する

質問 14

Given:

You want the code to produce this output:
John
Joe
Jane
Which code fragment should be inserted on line 1 and line 2 to produce the output?

（A）Insert Comparable<Person> on line 1.
Insert
public int compare(Person p1, Person p2) {
return p1.name.compare(p2.name);
}
on line 2.

（B）Insert Comparator<Person> on line 1.
Insert
public int compare(Person person) {
return person.name.compare(this.name);
}
on line 2.

（C）Insert Comparator<Person> on line 1.
Insert
public int compareTo(Person person) {
return person.name.compareTo(this.name);
}
on line 2.

（D）Insert Comparator<Person> on line 1.
Insert
public int compare(Person p1, Person p2) {
return p1.name.compare(p2.name);
}
on line 2.

正解：C 解答を投票する

質問 15

Given the formula to calculate a monthly mortgage payment:

and these declarations:

How can you code the formula?

（A）m = p * (r * Math.pow(1 + r, n) / Math.pow(1 + r, n) - 1);

（B）m = p * ((r * Math.pow(1 + r, n) / (Math.pow(1 + r, n)) - 1));

（C）m = p * (r * Math.pow(1 + r, n) / (Math.pow(1 + r, n) - 1));

（D）m = p * r * Math.pow(1 + r, n) / Math.pow(1 + r, n) - 1;

正解：C 解答を投票する

質問 16

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\another-project

（B）data\projects\a-project\..\..\another-project

（C）data\\projects\\a-project\\..\\..\\another-project

（D）data\projects\a-project\another-project

正解：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 17

Given:

What is the result?

（A）TuesdayUnknown

（B）Working

（C）Unknown

（D）Tuesday

（E）The compilation fails.

（F）WorkingUnknown

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 18

Given:

After which line can we insert assert i < 0 || values[i] <= values[i + 1]; to verify that the values array is partially sorted?

（A）after line 6

（B）after line 8

（C）after line 10

（D）after line 5

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 19

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

（A）var obj = new @Interned MyObject();

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

（C）var myString = (@NonNull String) str;

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

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

（F）var v = "Hello" + (@Interned) "World"

正解：A、B、D 解答を投票する

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

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