Java:可比较<List <T扩展Compareable <T >>>

Question

Compareable<Collection<T extends Compareable<T>>>Java中是否有任何实现(表现为C++ std::list<T>::operator<()或者std::set<T>::operator<())？

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编辑:Comparator会更有意义......

Answer 1

不是我所知道的,但写起来应该不会太难.

compareTo(Collection<T> other) {
    Iterator<T> i1 = this.iterator();
    Iterator<T> i2 = other.iterator();
    while(i1.hasNext() && i2.hasNext()) {
        int c = i1.next().compareTo(i2.next());
        if(c != 0) {
            return c;
        }
    }
    if(i1.hasNext()){
        return 1;
    } else if(i2.hasNext()) {
        return -1;
    } else {
        return 0;
    }
}