如何一次又一次地使用相同的迭代器？

本文介绍了如何一次又一次地使用相同的迭代器？的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

给出下一个代码：

//这是某个大方法的一部分//

ArrayList< String> players = this.m_maze.getPlayers（）; //将第一个节点定义为人类玩家，并从列表中弹出他 //其余节点是计算机端 Iterator< ;字符串> iterator = players.iterator（）; //人类边字符串humanPlayer = iterator.next（）; //控制器 - 在玩家之间开始游戏，至少有两名玩家玩而（this.m_rounds> 0） { String [] choices = this.m_view.getChoiceFromUser（）; int usersChoice = Integer.parseInt（choices [0]）; 开关（usersChoice） {案例1：//然后用户选择保留 { } 案例2：//然后采取下一步 { //让用户移动 this.m_maze = this.m_model.makeSomeMove（选择[1]，humanPlayer，TRUE）; //打印迷宫以进行可视化 this.m_view.drawMaze（m_maze）; //控制器 - 减少当前游戏的当前回合数 this.m_rounds--; } 案例31：//然后用户要求最近的宝贝 { //稍后在上放一些代码} 案例32：//然后用户要求最近的房间 { //稍后在放置一些代码} } //结束开关盒 } //结束时

（ 1）。每次调用 makeSomeMove 后，我如何在 humanPlayer 中放置ArrayList的第一个元素？ / p>

（2）。是否可以重用迭代器？因为我使用 hasnext（）和 next（） ...？

非常感谢 Ron

解决方案

如果你想要要重用迭代器，你必须重新初始化它。

你必须执行 Iterator< String> iterator = players.iterator（）; 每当你想重用迭代器时。

Given the next code :

// this is a part of some large method //

ArrayList<String> players = this.m_maze.getPlayers(); // define the first node to be the human player , and pop him from the list // the rest of the nodes are the computer side Iterator<String> iterator = players.iterator(); // human side String humanPlayer = iterator.next(); // controller - start a game between the players , at least two players are playing while (this.m_rounds > 0) { String[] choices = this.m_view.getChoiceFromUser(); int usersChoice = Integer.parseInt(choices[0]); switch (usersChoice) { case 1: // then user chose to stay put { } case 2: // then take the next step { // let the user make his move this.m_maze = this.m_model.makeSomeMove(choices[1],humanPlayer,true); // print out the maze for visualization this.m_view.drawMaze(m_maze); // controller - reduce the number of current rounds for the current game this.m_rounds--; } case 31: // then user asked for the closest treasure { // put some code here later on } case 32: // then user asked for the nearest room { // put some code here later on } } // end switch case } // end while

(1).How can I place in humanPlayer the first element of the ArrayList after each time that I invoke makeSomeMove ?

(2).Is it possible to reuse an iterator ? since I use the hasnext() and next() ... ?

Many thanks Ron

解决方案

If you want to reuse the iterator, you have to re-initialise it.

You have to execute Iterator<String> iterator = players.iterator(); whenever you want to reuse the iterator.