Online 1Z0-819 Practice Test

Question 1

Why does this compilation fail?

Options :

A : The method Y. print (object) does not call the method super.print (object)

B : The method x. print (object) is not accessible to Y

C : In method x. print (Collection), system. Out :: prints is an invalid Java identifier.

D : The method print (object) and the method print (object...) are duplicates of each other.

E : The method Y. print (object...) cannot override the final method x.print (object....).

Answer: D

Question 2

Which statement about access modifiers is correct?

Options :

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

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

C : An abstract method can be declared with the private modifier.

D : An inner class cannot be declared with the public modifier.

E : An interface can be declared with the protected modifier.

Answer: B

Question 3

Given:

Which statement on line 1 enables this code fragment to compile?

Options :

A : Function function = String::toUpperCase;

B : UnaryOperator function = s > s.toUpperCase();

C : UnaryOperator<String> function = String::toUpperCase;

D : Function<String> function = m > m.toUpperCase();

Answer: C

Question 4

You replace the code on line 1 to use ParallelStream.

Which one is correct?

Options :

A : The code will produce the same result.

B : The compilation fails.

C : A NoSuchElementException is thrown at run time.

D : The code may produce a different result.

Answer: D

Question 5

Which two statements are true about Java modules? (Choose two.)

Options :

A : Modular jars loaded from --module-path are automatic modules.

B : Any named module can directly access all classes in an automatic module.

C : Classes found in --classpath are part of an unnamed module.

D : Modular jars loaded from --classpath are automatic modules.

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

Answer: A,C

EXPERTY DESIGNED 1Z0-819 PRACTICE TEST