Online 1Z0-830 Practice Test

Question 1

Which of the following statements oflocal variables declared with varareinvalid?(Choose 4)

Options :

A : var a = 1;(Valid: var correctly infers int)

B : var b = 2, c = 3.0;

C : var d[] = new int[4];

D : var e;

E : var f = { 6 };

F : var h = (g = 7);

Answer: B,C,D,E

Question 2

Which methods compile?

Options :

A :

B :

C :

D :

Answer: A,B

Question 3

Given: java double amount = 42_000.00; NumberFormat format = NumberFormat.getCompactNumberInstance(Locale.FRANCE, NumberFormat.Style. SHORT); System.out.println(format.format(amount)); What is the output?

Options :

A : 42000E

B : 42 000,00 €

C : 42000

D : 42 k

Answer: D

Question 4

Given: java ExecutorService service = Executors.newFixedThreadPool(2); Runnable task = () -> System.out.println("Task is complete"); service.submit(task); service.shutdown(); service.submit(task); What happens when executing the given code fragment?

Options :

A : It prints "Task is complete" once and throws an exception.

B : It prints "Task is complete" twice and throws an exception.

C : It exits normally without printing anything to the console.

D : It prints "Task is complete" twice, then exits normally.

E : It prints "Task is complete" once, then exits normally.

Answer: A

Question 5

Which StringBuilder variable fails to compile? java public class StringBuilderInstantiations { public static void main(String[] args) { var stringBuilder1 = new StringBuilder(); var stringBuilder2 = new StringBuilder(10); var stringBuilder3 = new StringBuilder("Java"); var stringBuilder4 = new StringBuilder(new char[]{'J', 'a', 'v', 'a'}); } }

Options :

A : None of them

B : stringBuilder4

C : stringBuilder1

D : stringBuilder3

E : stringBuilder2

Answer: B

EXPERTY DESIGNED 1Z0-830 PRACTICE TEST