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Question 144

Given the code fragments:

and

Which two modifications enable to sort the elements of the emps list? (Choose two.)

Replace line n1 with class Person extends Comparator

At line n2 insert public int compareTo (Person p) { return this.name.compareTo (p.name); }

Replace line n1 with class Person implements Comparable

At line n2 insert public int compare (Person p1, Person p2) { return p1.name.compareTo (p2.name); }

At line n2 insert: public int compareTo (Person p, Person p2) { return p1.name.compareTo (p2.name); }

Replace line n1 with class Person implements Comparator

Correct Answer: B, C

To enable sorting of the elements in the emps list, the Person class must implement the Comparable interface and provide an implementation for the compareTo method. Replacing line n1 with 'class Person implements Comparable<Person>' (Option C) makes the Person class implement Comparable, which provides the compareTo method that Collections.sort requires. Inserting the method 'public int compareTo(Person p) { return this.name.compareTo(p.name); }' at line n2 (Option B) provides the necessary logic for comparing Person objects based on their names. With these modifications, the Collections.sort(emps) call will work correctly, because the Person objects will know how to compare themselves.

Discussion

Manuel7000

Agree and tested

DarGrinOptions: BC

Anser is B and C, since class Person should implement Comparable Interface and implement its method : int compareTo(T o)

steefaandOptions: BC

B and C are true.

samtash1034Options: BC

b，c，tested