Java SE 11 Programmer II (1Z0-816) Free Practice Test

Question 1

Given:
jdeps -jdkinternals C:\workspace4\SimpleSecurity\jar\classes.jar
Which describes the expected output?

A. jdeps outputs an error message that the -jdkinternals option requires either the -summary or the - verbose options to output to the console.

B. The -jdkinternals option analyzes all classes in the .jar and prints all class-level dependencies.

C. The -jdkinternals option analyzes all classes in the .jar for class-level dependencies on JDK internal APIs. If any are found, the results with suggested replacements are output in the console.

D. jdeps lists the module dependencies and the package names of all referenced JDK internal APIs. If any are found, the suggested replacements are output in the console.

Correct Answer: D

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Question 2

Which two are successful examples of autoboxing? (Choose two.)

A. Long c = 23L;

B. Double d = 4;

C. Float g = Float.valueOf(null);

D. Integer e = 5;

E. Float f = 6.0;

F. String a = "A";

Correct Answer: D,F

Question 3

Which two statements set the default locale used for formatting numbers, currency, and percentages? (Choose two.)

A. Locale.setDefault("en_CA");

B. Locale.setDefault(Locale.Category.FORMAT, "zh-CN");

C. Locale.setDefault("es", Locale.US);

D. Locale.setDefault(Locale.Category.FORMAT, Locale.CANADA_FRENCH);

E. Locale.setDefault(Locale.SIMPLIFIED_CHINESE);

Correct Answer: A,D

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Question 4

Consider this method declaration:

A) "SET SESSION AUTHORIZATION " + user
B) "SET SESSION AUTHORIZATION " + stmt.enquoteIdentifier(user)
Is A or B the correct replacement for <EXPRESSION> and why?

A. B, because enquoting values provided by the calling code prevents SQL injection.

B. A and B are functionally equivalent.

C. A, because it sends exactly the value of user provided by the calling code.

D. A, because it is unnecessary to enclose identifiers in quotes.

E. B, because all values provided by the calling code should be enquoted.

Correct Answer: C

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Question 5

Given:

What is the result?

A. 3 3 3 3

B. 5 5 3 3

C. 3 5 3 3

D. 3 5 3 5

Correct Answer: C

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Question 6

Given:

and:

Which code, when inserted on line 10, prints the number of unique localities from the roster list?

A. .map(e -> e.getLocality())
.collect(Collectors.toSet())
.count();

B. map(e -> e.getLocality())
.count();

C. .map(Employee::getLocality)
.distinct()
.count();

D. .filter(Employee::getLocality)
.distinct()
.count();

Correct Answer: D

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Question 7

Given:

After which line can we insert assert i < 0 || values[i] <= values[i + 1]; to verify that the values array is partially sorted?

A. after line 5

B. after line 8

C. after line 10

D. after line 6

Correct Answer: D

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Question 8

Given:
public class X {
}
and
public final class Y extends X {
}
What is the result of compiling these two classes?

A. The compilation fails because a final class cannot extend another class.

B. The compilation fails because either class X or class Y needs to implement the toString() method.

C. The compilation fails because there is no zero args constructor defined in class X.

D. The compilation succeeds.

Correct Answer: B

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Oracle Java SE 11 Programmer II (1Z0-816) Free Practice Test