oracle 1z0-819 practice test

Java SE 11 Developer Exam

Last exam update: Feb 21 ,2024
Page 1 out of 15. Viewing questions 1-15 out of 214

Question 1

Given the code fragment:

Which code fragment replaces the for statement?
A. IntStream.rangeClosed(l, 100).map(FizzBuzz::convert).forEach(System.out::println);
B. IntStream.ranged, 100).map(FizzBuzz::convert).forEach(System.out::println);
C. intstream.rangeclosed(l, 100).mapToObj{FizzBuzz::convert).forEach(System.out::printIn);
D. IntStream.range(1, 100).mapToObj(FizzBuzz::convert).forEach(System.out::println);

Answer:

A

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Question 2

Given:

Which two codes, independently, can be inserted in line to 1 compile?

  • A. Abacus aba = (int m, int n) -> { m * n };
  • B. Abacus aba = (int e, int f) -> { return e * f; };
  • C. Abacus aba = (a, b) -> a * b;
  • D. Abacus aba = v, w -> x * y;
  • E. Abacus aba = (int i, j) -> ( return i * j; };
Answer:

CE

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Question 3

Given:

What is the output?

  • A. A compilation error is thrown.
  • B. Message from Copier: Attempt00
  • C. Message from Abstract Copier: Attempt00
  • D. A runtime error is thrown.
Answer:

A

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Question 4

Given the code fragment:
Which two code snippets inserted independently inside print method print Mondial: domainmodal?

  • A. prefix + name
  • B. prefix + getName
  • C. new Main (} .prefix + new Main().name
  • D. prefix + Main, name
  • E. Main.prefix + Main.name
  • F. Main.prefix + Main.getName()
Answer:

CD

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Question 5

Your organization makes mlib.jar available to your cloud customers. While working on a code cleanup
project for mlib.jar, you see this method by customers:

What security measures should be added to this method so that it meets the requirements for a
customer accessible method?
A.

B. Create a method that validates the hostName and portNumber parameters before opening the
socket.
C. Make enableService private.
D. Enclose the call to new Socket In an AccessController.doPrivileged block.

Answer:

D

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Question 6

Given the code fragment:

Which can replace line 11?

  • A. UnaryOperator<Interger > uo = (var x ) -> (x * 3);
  • B. UnaryOperator<Interger >uo = var x -> { return x 3 ; };
  • C. UnaryOperator<Interger >uo = x -> { return x * 3; };
  • D. UnaryOperator<Interger >uo = (int x) -> x * 3;
Answer:

A

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Question 7

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

Answer:

D

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Question 8

Given the code fragment:

What change on line 1 will make this code compile?

  • A. Add catch (L |N e).
  • B. Add catch (L |M N e).
  • C. Add catch (L e).
  • D. Add catch (N | L | M e).
  • E. Add catch (M |L e).
Answer:

C

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Question 9

Given the code fragment:

What is the result?

  • A. An ArrayIndexOutofBoundsException is thrown at runtime.
  • B. The compilation fails.
  • C. gh ij kl
  • D. gj hk il
  • E. ghi jkl
Answer:

A

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Question 10


And the code fragment:

Which situation will occur on code fragment execution?

  • A. Livelock
  • B. Deadlock
  • C. Race Condition
  • D. Starvation
Answer:

D

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Question 11

Given:

Which three classes successfully override showFirst ()?
A)

B)

C)

D)

E)

F)

  • A. Option A
  • B. Option B
  • C. Option C
  • D. Option D
  • E. Option E
  • F. Option F
Answer:

C

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Question 12

Given:

A) An exception is thrown at run time.
B)

C) The compilation fails due to an error on line 2.
D) The compilation fails due to an error on line 1.
E)

F)
The compilation fails due to an error on line 3.

  • A. Option A
  • B. Option B
  • C. Option C
  • D. Option D
  • E. Option E
  • F. Option F
Answer:

A

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Question 13

Given the code fragment:

Which two statement inserted independently at line 1 enable this code to print PRRT?

  • A. i—;
  • B. continue b;
  • C. break b;
  • D. j--;
  • E. continue a;
  • F. break a ;
Answer:

F

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Question 14

Given:

What is the result?

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

B

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Question 15

Given the code fragment:

What is the result?
A)

B)

C)

D)

  • A. Option A
  • B. Option B
  • C. Option C
  • D. Option D
Answer:

C

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