迭代器使用图解和原理解析

示例图

迭代器使用图解和原理解析

    public interface Iterator {
 public abstract Object next();
 public abstract boolean hasnext();
}
public interface Iterable {
Iterator iterator();
}
public interface Collection extends Iterable{

}

public interface list extends Collection{

}

public class  ArrayList  implements  list{
public Iterator iterator() {
    return new Itr();
}
 private class Itr implements Iterator{
     //方法重写
     public   Object next();
     public   boolean hasnext();
     }
}

Collection c = new ArrayList(); 
c.add("hello");
c.add("ithelei");

Iterator it = c.iterator();  //反的是new Itr();

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