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

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 3

Which methods compile?

Options :

A :

B :

C :

D :

Answer: A,B

Question 4

Which three of the following are correct about the Java module system?

Options :

A : Code in an explicitly named module can access types in the unnamed module.

B : The unnamed module exports all of its packages.

C :

If a package is defined in both a named module and the unnamed module, then the package in the unnamed module is ignored.

D :

We must add a module descriptor to make an application developed using a Java version prior to SE9 run on Java 11.

E : The unnamed module can only access packages defined in the unnamed module.

F :

If a request is made to load a type whose package is not defined in any known module, then the module system will attempt to load it from the classpath.

Answer: B,C,F

Question 5

Given: java

String bread = optionalName.orElse("Baguette"); System.out.print("bread:" + bread); String dish = optionalName.orElseGet(() -> "Frog legs"); System.out.print(", dish:" + dish); try { String cheese = optionalName.orElseThrow(() -> new Exception()); System.out.println(", cheese:" + cheese); } catch (Exception exc) { System.out.println(", no cheese."); } What is printed?

Options :

A : bread:Baguette, dish:Frog legs, cheese.

B : bread:Baguette, dish:Frog legs, no cheese.

C : bread:bread, dish:dish, cheese.

D : Compilation fails.

Answer: B

EXPERTY DESIGNED 1Z0-830 PRACTICE TEST