public class Grade implements Comparable {
    private String name;
    private int chi,math,eng;

    public Grade(String n, int c, int m, int e) {
	name = n;
	chi = c;
	math = m;
	eng = e;
    }
    public int compareTo(Object y) {
	// bug! bug! 這裡應該無條件捨去嗎? 還是無條件進位呢?
	// 還是四捨五入呢? 或者以上皆非?
	return (int) (this.average() - ((Grade) y).average());
    }
    public String getName() { return name; }
    public double average() { return (chi+math+eng)/3.0; }
}