Which statement is true about the single abstract method of the java.util.function.Function interface?

1. A. It accepts one argument and returns void.
2. B. It accepts one argument and returns boolean.
3. C. It accepts one argument and always produces a result of the same type as the argument.
4. D. It accepts an argument and produces a result of any data type.

Correct Answer: D

Given the definition of the Country class: public class country {
public enum Continent {ASIA, EUROPE} String name;
Continent region;
public Country (String na, Continent reg) { name = na, region = reg;
}
public String getName () {return name;} public Continent getRegion () {return region;}
}
and the code fragment:
List couList = Arrays.asList (
new Country (“Japan”, Country.Continent.ASIA), new Country (“Italy”, Country.Continent.EUROPE),
new Country (“Germany”, Country.Continent.EUROPE)); Map> regionNames = couList.stream ()
.c ollect(Collectors.groupingBy (Country ::getRegion, Collectors.mapping(Country::getName, Collectors.toList())))); System.out.println(regionNames);

1. A. {EUROPE = [Italy, Germany], ASIA = [Japan]}
2. B. {ASIA = [Japan], EUROPE = [Italy, Germany]}
3. C. {EUROPE = [Germany, Italy], ASIA = [Japan]}
4. D. {EUROPE = [Germany], EUROPE = [Italy], ASIA = [Japan]}

Correct Answer: B

Given the code fragment:

Assume that:
The required database driver is configured in the classpath.
The appropriate database is accessible with the dbURL, userName, and passWord exists The Employee table has a column ID of type integer and the SQL query matches one record. What is the result?

1. A. Compilation fails at line 14.
2. B. Compilation fails at line 15.
3. C. The code prints the employee ID.
4. D. The code prints Error.

Correct Answer: A

Given:

and the code fragment:

Which definition of the ColorSorter class sorts the blocks list?

1. A. Option A
2. B. Option B
3. C. Option C
4. D. Option D

Correct Answer: B

Given the code fragment:
Path source = Paths.get (“/data/december/log.txt”); Path destination = Paths.get(“/data”);
Files.copy (source, destination);
and assuming that the file /data/december/log.txt is accessible and contains: 10-Dec-2014 – Executed successfully
What is the result?

1. A. A file with the name log.txt is created in the /data directory and the content of the /data/december/ log.txt file is copied to it.
2. B. The program executes successfully and does NOT change the file system.
3. C. A FileNotFoundException is thrown at run time.
4. D. A FileAlreadyExistsException is thrown at run time.

Correct Answer: D