1Z0-819試験無料問題集（297題）「Oracle Java SE 11 Developer 認定」

出題：1

Given:

What is the correct definition of the JsonField annotation that makes the Point class compile?

A.

B.

C.

正解：B 解答を投票する

出題：2

A company has an existing Java app that includes two Java 8 jar files, sales-3.10. jar and clients-10.2.jar.
The jar file ,sales -8, 10, jar reference packages in clients -10.2 jar, but clients-10.2 jar does not reference packages in sales -8.10, jar.
They have decided to modularize clients-10.2.jar.
Which module-info. Java file would work for the new library version clients-10.3 jar?

A.

B.

C.

D.

正解：A 解答を投票する

出題：3

Given these two classes:

And given this fragment:

Which describes the fragment?

A. It is subject to deadlock.

B. It throws IllegalMonitorStateException.

C. The code does not compile.

D. It is subject to livelock.

正解：C 解答を投票する

出題：4

Given the code fragment:

Which statement at line 1 will print Ping Pong?

A.

B.

C.

D.

正解：A 解答を投票する

出題：5

Given:

What is the result?

A. adf

B. The compilation fails.

C. abcd

D. abd

E. abdf

正解：C 解答を投票する

出題：6

Given the code fragment:

What is the result?

A. The compilation fails.

B. gj hk il

C. ghi jkl

D. gh ij kl

E. An ArrayIndexOutofBoundsException is thrown at runtime.

正解：E 解答を投票する

出題：7

Given:

What code inserted into class C would allow it to compile?

A. public void x() { }
public void z() { }

B. void x() { super.y(); }
public void z() { }

C. void x() { }
public void z() { }

D. public void x() { }
protected void y() { super.y(); }
public void z() { }

E. void x() { }
public void y() { }
public void z() { }

正解：A 解答を投票する

出題：8

Which statement about access modifiers is correct?

A. An instance variable can be declared with the static modifier.

B. A local variable can be declared with the final modifier.

C. An inner class cannot be declared with the public modifier.

D. An interface can be declared with the protected modifier.

E. An abstract method can be declared with the private modifier.

正解：B 解答を投票する

出題：9

Given the code fragment:

You want to validate a path name before the read file. Before validation, all path names should be canonicalized.
Which code inserted on line nl will accomplish this?

A.

B.

C.

D.

正解：B 解答を投票する

出題：10

Given TripleThis.java:

Compiling TripleThis.java gives this compiler warning:
Note: TripleThis.java uses unchecked or unsafe operations.
Which two replacements done together remove this compiler warning?

A. Replace line 9 with function<Integer> tripler = x-> - { return (Integer) X * 3 ; }.

B. Replace line 9 with function<Integer>, Integer> = X -> { return (integer) x * 3; }.

C. Replace line 12 with public static <T> void printValue (Function<T, T> f, T num ) {,

D. Replace line 12 with public static int printValue function<Integer, Integer>, f, T num {.

E. Replace line 12 with public static void printValue function<Integer> f, int num) {.

正解：A,D 解答を投票する

出題：11

Given:

Which statement on line 1 is calling the method of the supplier object correctly?

A. System.out.printin(supplier.test() );

B. System.out.printin(supplier.accept() );

C. System.out.printin(supplier.apply() );

D. System.out.printin(supplier.get() );

正解：D 解答を投票する

出題：12

Given the code fragment:

What is the result?

A. USD -> 1.00
GBP -> 0.75
EUR -> 0.84
CNY -> 6.42

B. The compilation fails.

C. CNY -> 6.42
EUR -> 0.84
GBP -> 0.75
USD -> 1.00

D. EUR -> 0.84
GBP -> 0.75
USD -> 1.00
CNY -> 6.42

正解：B 解答を投票する

解説: (GoShiken メンバーにのみ表示されます)

出題：13

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

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

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

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

正解：D 解答を投票する

出題：14

Given:

What is the result?

A. 2,34,54,5

B. 2,54,54,5

C. 2,34,54,3

D. 2,34,34,5

正解：B 解答を投票する

解説: (GoShiken メンバーにのみ表示されます)

出題：15

Which code fragment prints 100 random numbers?

A. Option D

B. Option C

C. Option A

D. Option B

正解：A 解答を投票する

出題：16

Which two safely validate inputs? (Choose two.)

A. Assume inputs have already been validated.

B. Accept only valid characters and input values.

C. Modify the input values, as needed, to pass validation.

D. Delegate numeric range checking of values to the database.

E. Use trusted domain-specific libraries to validate inputs.

正解：B,D 解答を投票する

出題：17

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.stream().collect(Collectors.averagingDouble(n -> n));

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

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

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

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

正解：C,E 解答を投票する

解説: (GoShiken メンバーにのみ表示されます)

出題：18

Given the code fragment:

Which can replace line 2?

A. UnaryOperator u = (var i) -> (i * 2);

B. UnaryOperator u = (int i) -> i * 2;

C. UnaryOperator u = var i -> { return i * 2; };

D. UnaryOperator u = i -> { return i * 2);

正解：A 解答を投票する

出題：19

Given:

You want to use the myResource class in a try-with-resources statement. Which change will accomplish this?

A. Extend AutoCloseable and override the autoClose method.

B. Implement AutoCloseable and override the autoClose method.

C. Implement AutoCloseable and override the close method.

D. Extend AutoCloseable and override the close method.

正解：C 解答を投票する

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