Which of the following statements correctly provides a comparator function using lambda expressions to sort an array of countries by population, assuming the existence of a getPopulation method?
A)Arrays.sort(countries, comparator(c - c.getPopulation()));
B)Arrays.sort(countries, compare(c1 - c1.getPopulation(), c2 - c2.getPopulation());
C)Arrays.sort(countries, (c1, c2) - c1.getPopulation() - c2.getPopulation());
D)Arrays.sort(countries, c - c.getPopulation());

Question

Which of the following statements correctly provides a comparator function using lambda expressions to sort an array of countries by population, assuming the existence of a getPopulation method?
A)Arrays.sort(countries, comparator(c -> c.getPopulation()));
B)Arrays.sort(countries, compare(c1 -> c1.getPopulation(), c2 -> c2.getPopulation());
C)Arrays.sort(countries, (c1, c2) -> c1.getPopulation() - c2.getPopulation());
D)Arrays.sort(countries, c -> c.getPopulation());

Quizplus · Accepted Answer

Option C correctly provides a comparator function using lambda expressions to sort an array of countries by population. It subtracts the population of the second element from the first element, which gives a negative value if the first element's population is smaller than that of the second element, and the opposite if the first element's population greater than the second element one. This results into sorting the array in ascending order by population.

Which of the Following Statements Correctly Provides a Comparator Function