适配器方法惯用法

import java.util.*;
class ReversibleArrayList<T> extends ArrayList<T>{
    public ReversibleArrayList(Collection<T> c) {super(c);}
    public Iterable<T> reversed(){
        return new Iterable<T>(){

            @Override
            public Iterator<T> iterator() {
                return new Iterator<T>(){
                    int current = size()-1;
                    @Override
                    public boolean hasNext() {
                        return current > -1;
                    }
                    @Override
                    public T next() {
                        return get(current--);
                    }
                };
            }
        };
    }
}


public class AdapterMethodiom 
{
    
    public static void main(String[] args) {
        ReversibleArrayList<String> ral = new ReversibleArrayList(Arrays.asList(("hello world ni hao").split(" ")));
        for(String s:ral)
        {
            System.out.print(s+" ");
        }
        System.out.println();
        for(String s:ral.reversed())
        {
            System.out.print(s+" ");
        }
        System.out.println();
    }
}