`

java中iter.hasnext()的意思

    博客分类:
  • JAVA
阅读更多
hasNext()  如果仍有元素可以迭代,则返回 true。

返回迭代的下一个元素。并把迭代输出的结果强制转换成Car对象


hasNext()是判断是否有下一个元素

next() 得到下一个元素


iter.hasNext():判断集合中是否有下一个car
iter.next():返回集合中的下一个car
分享到:
评论

相关推荐

    怎样遍历一个HashMap?

    iter.hasNext();) { <br> Map.Entry entry = (Map.Entry) iter.next(); <br> Object key = entry.getKey(); <br> Object val = entry.getValue(); <br>} <br>或者: <br>Map map = new HashMap();...

    java解析json

    iter.hasNext();) { JSONObject jsonObject = (JSONObject) iter.next(); list.add(JSONObject.toBean(jsonObject, cla)); } } catch (Exception ex) { ex.printStackTrace(); } return list; ...

    java简单小程序九九乘法表

    import java.io.*; import java.util.*; class SimpleLocalDriveSearch { ... iter.hasNext( ); ) System.out.println( iter.next( ) ); else System.out.println( "No match on " + roots[ i ] ); } }

    flex中的文件上传(简单例子)

    while (iter.hasNext()) { FileItem item = (FileItem) iter.next(); if (!item.isFormField()) { String name = item.getName(); System.out.println(name); try { item.write(new...

    ocjp题库 1z0-851

    iter.hasNext(); ) { 14. int i = ((Integer)iter.next()).intValue(); 15. sum += i; 16. } 17. return sum; 18. } What three changes allow the class to be used with generics and avoid an unchecked warning...

    set.list.map接口

    while(Iter.hasNext()){ System.out.println(Iter.next()); } } } 3.Map(映射<集合>)是无序的,是一种把键对象和值对象进行映射的集合,它每一个元素都包含一对键对象和值对象,给出键对象就可以得到值...

    XFire 和spring完整集成实例

    iter.hasNext();) { UserInfo a = iter.next(); System.out.println(a); } } catch (MalformedURLException e) { e.printStackTrace(); } } public static void setServiceList() { Service service =...

    递归拿到所有子类的id

    while(iter.hasNext()){ Student student = (Student)iter.next(); if(i.equals(student.getParentid())){ list2.add(student.getId()); getAll(student.getId(),list); } } return list...

    图片文件上次,获取图片文件实际类型

    iter.hasNext()) { return null; } ImageReader reader = iter.next(); return reader.getFormatName(); } catch (IOException e) { e.printStackTrace(); return null; } ...

    Hibernate中的query 分页.doc

    iter.hasNext();) { 14. User user = (User)iter.next(); 15. System.out.println(user.getId()); 16. System.out.println(user.getName()); 17. } 18. session.getTransaction().commit(); 19. }catch...

    johnson-trotter:Johnson-Trotter 置换算法的实现

    hasNext ( ) ) { iter . next ( ) ; //=> ['foo', 'bar', 'baz'] //=> ['foo', 'baz', 'bar'] //=> ['baz', 'foo', 'bar'] //=> ['baz', 'bar', 'foo'] //=> ['bar', 'baz', 'foo'] //=> ['bar', 'foo', '...

    dom4j

    <br> while(iter.hasNext()){ <br> Element bookElement = (Element)iter.next(); <br> Iterator iterator = bookElement.elementIterator("title"); <br> while(iterator.hasNext()){ <br> Element...

    commons-fileupload-1.2.jar和commons-io-1.3.2.jar

    while (iter.hasNext()) { FileItem item = (FileItem) iter.next(); // 忽略其他不是文件域的所有表单信息 if (!item.isFormField()) { String name = item.getName(); long size = item.getSize(); if (...

    火车票管理系统

    while(iter.hasNext()){ Ticket ticket =iter.next(); sta.addBatch("insert into ticket(ticketNumber,trainNumber,trainDate,startStation,endStation,"+ "price,carriageNum,seatNum,type,grade,userId) ...

    旅店管理系统界面-手工书写

    while(iter.hasNext()) { String id = iter.next(); if(this.ID == Integer.parseInt(id.trim())) b = this.tempMap.get(id); } return b; } //getcustomer的信息 public Customer getCustomer...

    jsp探针 ver0.1

    java.io.BufferedReader in = new java.io.BufferedReader(new java.io.InputStreamReader( process.getInputStream())); String freeSpace = "", line; while ((line = in.readLine()) != null) { if (line.length...

    二十三种设计模式【PDF版】

    会 Java 的人越来越多,但是一直徘徊在语言层次的程序员不在少数,真正掌握 Java 中接口或抽象类的应用不是很多,大家 经常以那些技术只适合大型项目为由,避开或忽略它们,实际中,Java 的接口或抽象类是真正体现 ...

Global site tag (gtag.js) - Google Analytics