java容器

viewclass Stone {
    private int volume;

    public Stone(int volume) {
        this.volume = volume;
    }

    public int getVolume() {
        return volume;
    }

    //...........省略..........//
}

class Stick implements Comparable{
    private int length;

    public Stick(int length) {
        this.length = length;
    }

    public int getLength() {
        return length;
    }

    @Override
    public int compareTo(Object o) {
        Stick st = (Stick)o;
        return this.getLength() - st.getLength();
    }

    //...........省略..........//
}

public class MyComparator implements Comparator<Stone>{

    @Override
    public int compare(Stone st1, Stone st2) {
        return st1.getVolume() - st2.getVolume();
    }

    public static void main(String[] args) {
        new TreeSet<Stone>(new MyComparator());

        new TreeSet<Stick>();
    }
}