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AP Computer Science A· difficulty 3/5

public class Item implements Comparable<Item> {
    private int price;
    public Item(int p) { price = p; }
    public int compareTo(Item other) {
        return this.price - other.price;
    }
}
// Usage:
Item a = new Item(50);
Item b = new Item(30);
System.out.print(a.compareTo(b));

What is printed?

A
$0$
B
$-20$
C
$1$
D
$20$
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Explanation

a.price - b.price = 50 - 30 = 20. compareTo returns this difference, so 20 is printed (positive means a > b).

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