Java--设计模式-19-迭代器模式

packagecom.xing.design.iterator;
importjava.util.ArrayList;
importjava.util.Iterator;
importjava.util.List;
/*** 相当于List，可以迭代* @author xing* @createTime*/publicclassMyListimplementsIterable<String>{
privatefinalList<String>strList=newArrayList<>();
publicMyList() {
strList.add("第一个元素");
strList.add("第二个元素");
strList.add("第三个元素");
  }
@OverridepublicIterator<String>iterator() {
returnnewMyIterator();
  }
/***  内部类是一个迭代器哈* @author xing* @createTime*/privateclassMyIteratorimplementsIterator<String> {
intindex=0;
@OverridepublicbooleanhasNext() {
returnindex<strList.size()?true :false;
    }
@OverridepublicStringnext() {
Stringstr=strList.get(index);
index++;
returnstr;
    }
  }
}

packagecom.xing.design.iterator;
importjava.util.Iterator;
publicclassIteratorDemo {
publicstaticvoidmain(String[] args) {
MyListmyList=newMyList();
// 获取我们得到的那个迭代器Iterator<String>iterator=myList.iterator();
while (iterator.hasNext()){
System.out.println(iterator.next());
    }
for (Stringstr : myList) {
System.out.println(str);
    }
  }
}