forEach与迭代器

任何实现了Iterable接口的类，都可以用forEach语句，并且Java中大部分的Collection都可以用forEach,除了Map
 1 import java.util.*;
public class AdapterMethodiom implements Iterable<String>
{
    protected String[] words = ("hello world this is a good day").split(" ");
    public Iterator<String> iterator() {
        return new Iterator<String>(){
            private int index =0;

            @Override
            public boolean hasNext() {
                return index < words.length;
            }

            @Override
            public String next() {
            
                return words[index++];
            }
            
        };
        
    }
    public static void main(String[] args) {
        for(String s:new AdapterMethodiom())
        {
            System.out.println(s+" ");
        }
        
    }
}