适配器模式

Collection<E>

+ iterator():Iterator<E>

Enumeration<E>

+ hasMoreElements():boolean + nextElement():E

TestAdapter

- e:Enumeration

+ hasNext():boolean + next():E

List<E>

StringTokenizer

+ hasMoreElements():boolean + + nextElement():Object

Util

+ walk(Iterator it):void

ArrayList

Interface

Iterator<E>

+ hasNext():boolean + next():E

walk(new TestAdapter(new StringTokenizer))

想使用Util类方法

Itr

Iterable<T>

+ iterator():Iterator<T>