Sorting

AP Computer Science A· difficulty 3/5

public class Score implements Comparable<Score> {
    private int v;
    public Score(int x) { v = x; }
    public int compareTo(Score o) { return o.v - this.v; }
    public int getV() { return v; }
}
// Usage:
ArrayList<Score> list = new ArrayList<Score>();
list.add(new Score(10));
list.add(new Score(30));
list.add(new Score(20));
// After Collections.sort(list):
System.out.print(list.get(0).getV());

What value is at index 0?

A
$20$
B
$Sorting fails$
C
$30$
check_circle
D
$10$

Explanation

compareTo returns o.v - this.v, which reverses ordering. The largest value (30) is sorted first.

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