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Question 20

Given:

You want the code to produce this output:

John -

Joe -

Jane -

Which code fragment should be inserted on line 1 and line 2 to produce the output?

Insert Comparator on line 1.

Insert -

public int compare(Person p1, Person p2) {

return p1.name.compare(p2.name);

}

on line 2.

Insert Comparator on line 1.

Insert -

public int compareTo(Person person) {

return person.name.compareTo(this.name);

}

on line 2.

Insert Comparable on line 1.

Insert -

public int compare(Person p1, Person p2) {

return p1.name.compare(p2.name);

}

on line 2.

Insert Comparator on line 1.

Insert -

public int compare(Person person) {

return person.name.compare(this.name);

}

on line 2.

Correct Answer: B

To produce the desired output, the Person class needs to implement the Comparator<Person> interface for custom sorting. The compareTo method in option B is correctly written to compare the names of Person objects in reverse order, which is needed to produce the descending order output shown: 'John', 'Joe', and 'Jane'.

Discussion

Sa16253748596Option: B

A,B,C,D are all wrong. B is better than the others. Insert Comparator<Person> on line 1. Correct. Insert - public int compare(Person person) { return person.name.compareTo(this.name); } on line 2. is correct.