Online 1Z0-819 Practice Test

Question 1

Given:

What is the result?

Options :

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

Question 2

Given:

You want to calculate the average of the Player’s score.

Which statement inserted on line 1 will accomplish this?

Options :

A : players.stream().average().orElse(0.0);

B : players.stream().mapToInt(a -> a.score).average().orElse(0.0);

C : players.stream().mapToDouble(a -> a.score).average();

D : players.stream().map(a -> a.score).average();

Answer: B

Question 3

Given:

2021-04-27-22-23-17-3d4ddcb379cef75d65c8f83ed91c42db

What is the result?

Options :

A : null

B : nothing

C : It fails to compile.

D : java.lang.IllegalAccessException is thrown.

E : Student

Answer: C

Question 4

Given:

Which would cause s to be AQCD?

Options :

A : s.replace(s.indexOf(''A''), s.indexOf(''C''), ''Q'');

B : s.replace(s.indexOf(''B''), s.indexOf(''C''), ''Q'');

C : s.replace(s.indexOf(''B''), s.indexOf(''B''), ''Q'');

D : s.replace(s.indexOf(''A''), s.indexOf(''B''), ''Q'');

Answer: B

Question 5

Given:

Which code fragment on line 1 makes the s1 set contain the names of all employees born before January 1, 1989?

Options :

A :

B :

C :

D :

Answer: B

EXPERTY DESIGNED 1Z0-819 PRACTICE TEST