Scala中常见的容器 Iterator (迭代器)

淩亂°似流年 2022-09-25 00:21 237阅读 0赞

Scala Iterator（迭代器）不是一个集合，它是一种用于访问集合的方法。

迭代器 it 的两个基本操作是 **next** 和 **hasNext**。

调用 **it.next()** 会返回迭代器的下一个元素，并且更新迭代器的状态。

调用 **it.hasNext()** 用于检测集合中是否还有元素。

让迭代器 it 逐个返回所有元素最简单的方法是使用 while 循环：

object Test {
       
       def main(args: Array[String]) {
       
          val it = Iterator("Baidu", "Google", "Runoob", "Taobao")
          
          while (it.hasNext){
       
             println(it.next())
          }
       }
    }

执行以上代码，输出结果为：

$ scalac Test.scala 
    $ scala Test
    Baidu
    Google
    Runoob
    Taobao

--------------------

## 查找最大与最小元素 ##

你可以使用 **it.min** 和 **it.max** 方法从迭代器中查找最大与最小元素，实例如下:

object Test {
       
       def main(args: Array[String]) {
       
          val ita = Iterator(20,40,2,50,69, 90)
          val itb = Iterator(20,40,2,50,69, 90)
          
          println("最大元素是：" + ita.max )
          println("最小元素是：" + itb.min )
    
       }
    }

执行以上代码，输出结果为：

$ scalac Test.scala 
    $ scala Test
    最大元素是：90
    最小元素是：2

--------------------

## 获取迭代器的长度 ##

你可以使用 **it.size** 或 **it.length** 方法来查看迭代器中的元素个数。实例如下：

object Test {
       
       def main(args: Array[String]) {
       
          val ita = Iterator(20,40,2,50,69, 90)
          val itb = Iterator(20,40,2,50,69, 90)
          
          println("ita.size 的值: " + ita.size )
          println("itb.length 的值: " + itb.length )
    
       }
    }

执行以上代码，输出结果为：

$ scalac Test.scala 
    $ scala Test
    ita.size 的值: 6
    itb.length 的值: 6

--------------------

## Scala Iterator 常用方法 ##

下表列出了 Scala Iterator 常用的方法：

<table style="border:0px; margin:4px 0px; padding:0px; border-collapse:collapse; width:729px; color:rgb(51,51,51); font-family:&quot;Open Sans&quot;,&quot;Helvetica Neue&quot;,Helvetica,Arial,STHeiti,&quot;Microsoft Yahei&quot;,sans-serif; font-size:12px"> 
 <tbody style="border:0px; margin:0px; padding:0px"> 
 <tr style="border:0px; margin:0px; padding:0px; background-color:rgb(246,244,240)"> 
 <th style="border:1px solid rgb(85,85,85); margin:0px; padding:3px; color:rgb(255,255,255); vertical-align:top; text-align:left; width:30px; background-color:rgb(85,85,85)"> 序号</th> 
 <th style="border:1px solid rgb(85,85,85); margin:0px; padding:3px; color:rgb(255,255,255); vertical-align:top; text-align:left; width:685px; background-color:rgb(85,85,85)"> 方法及描述</th> 
 </tr> 
 <tr style="border:0px; margin:0px; padding:0px"> 
 <td style="border:1px solid rgb(212,212,212); margin:0px; padding:7px 5px; font-size:1em; vertical-align:top"> 1</td> 
 <td style="border:1px solid rgb(212,212,212); margin:0px; padding:7px 5px; font-size:1em; vertical-align:top"> <p style="border:0px; margin-top:0px; margin-bottom:0px; padding-top:0px; padding-bottom:0px; line-height:2em; font-family:&quot;Microsoft Yahei&quot;,&quot;Helvetica Neue&quot;,Helvetica,Arial,sans-serif"> def hasNext: Boolean <p style="border:0px; margin-top:0px; margin-bottom:0px; padding-top:0px; padding-bottom:0px; line-height:2em; font-family:&quot;Microsoft Yahei&quot;,&quot;Helvetica Neue&quot;,Helvetica,Arial,sans-serif"> 如果还有可返回的元素，返回true。 </td> 
 </tr> 
 <tr style="border:0px; margin:0px; padding:0px; background-color:rgb(246,244,240)"> 
 <td style="border:1px solid rgb(212,212,212); margin:0px; padding:7px 5px; font-size:1em; vertical-align:top"> 2</td> 
 <td style="border:1px solid rgb(212,212,212); margin:0px; padding:7px 5px; font-size:1em; vertical-align:top"> <p style="border:0px; margin-top:0px; margin-bottom:0px; padding-top:0px; padding-bottom:0px; line-height:2em; font-family:&quot;Microsoft Yahei&quot;,&quot;Helvetica Neue&quot;,Helvetica,Arial,sans-serif"> def next(): A <p style="border:0px; margin-top:0px; margin-bottom:0px; padding-top:0px; padding-bottom:0px; line-height:2em; font-family:&quot;Microsoft Yahei&quot;,&quot;Helvetica Neue&quot;,Helvetica,Arial,sans-serif"> 返回迭代器的下一个元素，并且更新迭代器的状态 </td> 
 </tr> 
 <tr style="border:0px; margin:0px; padding:0px"> 
 <td style="border:1px solid rgb(212,212,212); margin:0px; padding:7px 5px; font-size:1em; vertical-align:top"> 3</td> 
 <td style="border:1px solid rgb(212,212,212); margin:0px; padding:7px 5px; font-size:1em; vertical-align:top"> <p style="border:0px; margin-top:0px; margin-bottom:0px; padding-top:0px; padding-bottom:0px; line-height:2em; font-family:&quot;Microsoft Yahei&quot;,&quot;Helvetica Neue&quot;,Helvetica,Arial,sans-serif"> def ++(that: =&gt; Iterator[A]): Iterator[A] <p style="border:0px; margin-top:0px; margin-bottom:0px; padding-top:0px; padding-bottom:0px; line-height:2em; font-family:&quot;Microsoft Yahei&quot;,&quot;Helvetica Neue&quot;,Helvetica,Arial,sans-serif"> 合并两个迭代器 </td> 
 </tr> 
 <tr style="border:0px; margin:0px; padding:0px; background-color:rgb(246,244,240)"> 
 <td style="border:1px solid rgb(212,212,212); margin:0px; padding:7px 5px; font-size:1em; vertical-align:top"> 4</td> 
 <td style="border:1px solid rgb(212,212,212); margin:0px; padding:7px 5px; font-size:1em; vertical-align:top"> <p style="border:0px; margin-top:0px; margin-bottom:0px; padding-top:0px; padding-bottom:0px; line-height:2em; font-family:&quot;Microsoft Yahei&quot;,&quot;Helvetica Neue&quot;,Helvetica,Arial,sans-serif"> def ++[B &gt;: A](that :=&gt; GenTraversableOnce[B]): Iterator[B] <p style="border:0px; margin-top:0px; margin-bottom:0px; padding-top:0px; padding-bottom:0px; line-height:2em; font-family:&quot;Microsoft Yahei&quot;,&quot;Helvetica Neue&quot;,Helvetica,Arial,sans-serif"> 合并两个迭代器 </td> 
 </tr> 
 <tr style="border:0px; margin:0px; padding:0px"> 
 <td style="border:1px solid rgb(212,212,212); margin:0px; padding:7px 5px; font-size:1em; vertical-align:top"> 5</td> 
 <td style="border:1px solid rgb(212,212,212); margin:0px; padding:7px 5px; font-size:1em; vertical-align:top"> <p style="border:0px; margin-top:0px; margin-bottom:0px; padding-top:0px; padding-bottom:0px; line-height:2em; font-family:&quot;Microsoft Yahei&quot;,&quot;Helvetica Neue&quot;,Helvetica,Arial,sans-serif"> def addString(b: StringBuilder): StringBuilder <p style="border:0px; margin-top:0px; margin-bottom:0px; padding-top:0px; padding-bottom:0px; line-height:2em; font-family:&quot;Microsoft Yahei&quot;,&quot;Helvetica Neue&quot;,Helvetica,Arial,sans-serif"> 添加一个字符串到 StringBuilder b </td> 
 </tr> 
 <tr style="border:0px; margin:0px; padding:0px; background-color:rgb(246,244,240)"> 
 <td style="border:1px solid rgb(212,212,212); margin:0px; padding:7px 5px; font-size:1em; vertical-align:top"> 6</td> 
 <td style="border:1px solid rgb(212,212,212); margin:0px; padding:7px 5px; font-size:1em; vertical-align:top"> <p style="border:0px; margin-top:0px; margin-bottom:0px; padding-top:0px; padding-bottom:0px; line-height:2em; font-family:&quot;Microsoft Yahei&quot;,&quot;Helvetica Neue&quot;,Helvetica,Arial,sans-serif"> def addString(b: StringBuilder, sep: String): StringBuilder <p style="border:0px; margin-top:0px; margin-bottom:0px; padding-top:0px; padding-bottom:0px; line-height:2em; font-family:&quot;Microsoft Yahei&quot;,&quot;Helvetica Neue&quot;,Helvetica,Arial,sans-serif"> 添加一个字符串到 StringBuilder b，并指定分隔符 </td> 
 </tr> 
 <tr style="border:0px; margin:0px; padding:0px"> 
 <td style="border:1px solid rgb(212,212,212); margin:0px; padding:7px 5px; font-size:1em; vertical-align:top"> 7</td> 
 <td style="border:1px solid rgb(212,212,212); margin:0px; padding:7px 5px; font-size:1em; vertical-align:top"> <p style="border:0px; margin-top:0px; margin-bottom:0px; padding-top:0px; padding-bottom:0px; line-height:2em; font-family:&quot;Microsoft Yahei&quot;,&quot;Helvetica Neue&quot;,Helvetica,Arial,sans-serif"> def buffered: BufferedIterator[A] <p style="border:0px; margin-top:0px; margin-bottom:0px; padding-top:0px; padding-bottom:0px; line-height:2em; font-family:&quot;Microsoft Yahei&quot;,&quot;Helvetica Neue&quot;,Helvetica,Arial,sans-serif"> 迭代器都转换成 BufferedIterator </td> 
 </tr> 
 <tr style="border:0px; margin:0px; padding:0px; background-color:rgb(246,244,240)"> 
 <td style="border:1px solid rgb(212,212,212); margin:0px; padding:7px 5px; font-size:1em; vertical-align:top"> 8</td> 
 <td style="border:1px solid rgb(212,212,212); margin:0px; padding:7px 5px; font-size:1em; vertical-align:top"> <p style="border:0px; margin-top:0px; margin-bottom:0px; padding-top:0px; padding-bottom:0px; line-height:2em; font-family:&quot;Microsoft Yahei&quot;,&quot;Helvetica Neue&quot;,Helvetica,Arial,sans-serif"> def contains(elem: Any): Boolean <p style="border:0px; margin-top:0px; margin-bottom:0px; padding-top:0px; padding-bottom:0px; line-height:2em; font-family:&quot;Microsoft Yahei&quot;,&quot;Helvetica Neue&quot;,Helvetica,Arial,sans-serif"> 检测迭代器中是否包含指定元素 </td> 
 </tr> 
 <tr style="border:0px; margin:0px; padding:0px"> 
 <td style="border:1px solid rgb(212,212,212); margin:0px; padding:7px 5px; font-size:1em; vertical-align:top"> 9</td> 
 <td style="border:1px solid rgb(212,212,212); margin:0px; padding:7px 5px; font-size:1em; vertical-align:top"> <p style="border:0px; margin-top:0px; margin-bottom:0px; padding-top:0px; padding-bottom:0px; line-height:2em; font-family:&quot;Microsoft Yahei&quot;,&quot;Helvetica Neue&quot;,Helvetica,Arial,sans-serif"> def copyToArray(xs: Array[A], start: Int, len: Int): Unit <p style="border:0px; margin-top:0px; margin-bottom:0px; padding-top:0px; padding-bottom:0px; line-height:2em; font-family:&quot;Microsoft Yahei&quot;,&quot;Helvetica Neue&quot;,Helvetica,Arial,sans-serif"> 将迭代器中选定的值传给数组 </td> 
 </tr> 
 <tr style="border:0px; margin:0px; padding:0px; background-color:rgb(246,244,240)"> 
 <td style="border:1px solid rgb(212,212,212); margin:0px; padding:7px 5px; font-size:1em; vertical-align:top"> 10</td> 
 <td style="border:1px solid rgb(212,212,212); margin:0px; padding:7px 5px; font-size:1em; vertical-align:top"> <p style="border:0px; margin-top:0px; margin-bottom:0px; padding-top:0px; padding-bottom:0px; line-height:2em; font-family:&quot;Microsoft Yahei&quot;,&quot;Helvetica Neue&quot;,Helvetica,Arial,sans-serif"> def count(p: (A) =&gt; Boolean): Int <p style="border:0px; margin-top:0px; margin-bottom:0px; padding-top:0px; padding-bottom:0px; line-height:2em; font-family:&quot;Microsoft Yahei&quot;,&quot;Helvetica Neue&quot;,Helvetica,Arial,sans-serif"> 返回迭代器元素中满足条件p的元素总数。 </td> 
 </tr> 
 <tr style="border:0px; margin:0px; padding:0px"> 
 <td style="border:1px solid rgb(212,212,212); margin:0px; padding:7px 5px; font-size:1em; vertical-align:top"> 11</td> 
 <td style="border:1px solid rgb(212,212,212); margin:0px; padding:7px 5px; font-size:1em; vertical-align:top"> <p style="border:0px; margin-top:0px; margin-bottom:0px; padding-top:0px; padding-bottom:0px; line-height:2em; font-family:&quot;Microsoft Yahei&quot;,&quot;Helvetica Neue&quot;,Helvetica,Arial,sans-serif"> def drop(n: Int): Iterator[A] <p style="border:0px; margin-top:0px; margin-bottom:0px; padding-top:0px; padding-bottom:0px; line-height:2em; font-family:&quot;Microsoft Yahei&quot;,&quot;Helvetica Neue&quot;,Helvetica,Arial,sans-serif"> 返回丢弃前n个元素新集合 </td> 
 </tr> 
 <tr style="border:0px; margin:0px; padding:0px; background-color:rgb(246,244,240)"> 
 <td style="border:1px solid rgb(212,212,212); margin:0px; padding:7px 5px; font-size:1em; vertical-align:top"> 12</td> 
 <td style="border:1px solid rgb(212,212,212); margin:0px; padding:7px 5px; font-size:1em; vertical-align:top"> <p style="border:0px; margin-top:0px; margin-bottom:0px; padding-top:0px; padding-bottom:0px; line-height:2em; font-family:&quot;Microsoft Yahei&quot;,&quot;Helvetica Neue&quot;,Helvetica,Arial,sans-serif"> def dropWhile(p: (A) =&gt; Boolean): Iterator[A] <p style="border:0px; margin-top:0px; margin-bottom:0px; padding-top:0px; padding-bottom:0px; line-height:2em; font-family:&quot;Microsoft Yahei&quot;,&quot;Helvetica Neue&quot;,Helvetica,Arial,sans-serif"> 从左向右丢弃元素，直到条件p不成立 </td> 
 </tr> 
 <tr style="border:0px; margin:0px; padding:0px"> 
 <td style="border:1px solid rgb(212,212,212); margin:0px; padding:7px 5px; font-size:1em; vertical-align:top"> 13</td> 
 <td style="border:1px solid rgb(212,212,212); margin:0px; padding:7px 5px; font-size:1em; vertical-align:top"> <p style="border:0px; margin-top:0px; margin-bottom:0px; padding-top:0px; padding-bottom:0px; line-height:2em; font-family:&quot;Microsoft Yahei&quot;,&quot;Helvetica Neue&quot;,Helvetica,Arial,sans-serif"> def duplicate: (Iterator[A], Iterator[A]) <p style="border:0px; margin-top:0px; margin-bottom:0px; padding-top:0px; padding-bottom:0px; line-height:2em; font-family:&quot;Microsoft Yahei&quot;,&quot;Helvetica Neue&quot;,Helvetica,Arial,sans-serif"> 生成两个能分别返回迭代器所有元素的迭代器。 </td> 
 </tr> 
 <tr style="border:0px; margin:0px; padding:0px; background-color:rgb(246,244,240)"> 
 <td style="border:1px solid rgb(212,212,212); margin:0px; padding:7px 5px; font-size:1em; vertical-align:top"> 14</td> 
 <td style="border:1px solid rgb(212,212,212); margin:0px; padding:7px 5px; font-size:1em; vertical-align:top"> <p style="border:0px; margin-top:0px; margin-bottom:0px; padding-top:0px; padding-bottom:0px; line-height:2em; font-family:&quot;Microsoft Yahei&quot;,&quot;Helvetica Neue&quot;,Helvetica,Arial,sans-serif"> def exists(p: (A) =&gt; Boolean): Boolean <p style="border:0px; margin-top:0px; margin-bottom:0px; padding-top:0px; padding-bottom:0px; line-height:2em; font-family:&quot;Microsoft Yahei&quot;,&quot;Helvetica Neue&quot;,Helvetica,Arial,sans-serif"> 返回一个布尔值，指明迭代器元素中是否存在满足p的元素。 </td> 
 </tr> 
 <tr style="border:0px; margin:0px; padding:0px"> 
 <td style="border:1px solid rgb(212,212,212); margin:0px; padding:7px 5px; font-size:1em; vertical-align:top"> 15</td> 
 <td style="border:1px solid rgb(212,212,212); margin:0px; padding:7px 5px; font-size:1em; vertical-align:top"> <p style="border:0px; margin-top:0px; margin-bottom:0px; padding-top:0px; padding-bottom:0px; line-height:2em; font-family:&quot;Microsoft Yahei&quot;,&quot;Helvetica Neue&quot;,Helvetica,Arial,sans-serif"> def filter(p: (A) =&gt; Boolean): Iterator[A] <p style="border:0px; margin-top:0px; margin-bottom:0px; padding-top:0px; padding-bottom:0px; line-height:2em; font-family:&quot;Microsoft Yahei&quot;,&quot;Helvetica Neue&quot;,Helvetica,Arial,sans-serif"> 返回一个新迭代器 ，指向迭代器元素中所有满足条件p的元素。 </td> 
 </tr> 
 <tr style="border:0px; margin:0px; padding:0px; background-color:rgb(246,244,240)"> 
 <td style="border:1px solid rgb(212,212,212); margin:0px; padding:7px 5px; font-size:1em; vertical-align:top"> 16</td> 
 <td style="border:1px solid rgb(212,212,212); margin:0px; padding:7px 5px; font-size:1em; vertical-align:top"> <p style="border:0px; margin-top:0px; margin-bottom:0px; padding-top:0px; padding-bottom:0px; line-height:2em; font-family:&quot;Microsoft Yahei&quot;,&quot;Helvetica Neue&quot;,Helvetica,Arial,sans-serif"> def filterNot(p: (A) =&gt; Boolean): Iterator[A] <p style="border:0px; margin-top:0px; margin-bottom:0px; padding-top:0px; padding-bottom:0px; line-height:2em; font-family:&quot;Microsoft Yahei&quot;,&quot;Helvetica Neue&quot;,Helvetica,Arial,sans-serif"> 返回一个迭代器，指向迭代器元素中不满足条件p的元素。 </td> 
 </tr> 
 <tr style="border:0px; margin:0px; padding:0px"> 
 <td style="border:1px solid rgb(212,212,212); margin:0px; padding:7px 5px; font-size:1em; vertical-align:top"> 17</td> 
 <td style="border:1px solid rgb(212,212,212); margin:0px; padding:7px 5px; font-size:1em; vertical-align:top"> <p style="border:0px; margin-top:0px; margin-bottom:0px; padding-top:0px; padding-bottom:0px; line-height:2em; font-family:&quot;Microsoft Yahei&quot;,&quot;Helvetica Neue&quot;,Helvetica,Arial,sans-serif"> def find(p: (A) =&gt; Boolean): Option[A] <p style="border:0px; margin-top:0px; margin-bottom:0px; padding-top:0px; padding-bottom:0px; line-height:2em; font-family:&quot;Microsoft Yahei&quot;,&quot;Helvetica Neue&quot;,Helvetica,Arial,sans-serif"> 返回第一个满足p的元素或None。注意：如果找到满足条件的元素，迭代器会被置于该元素之后；如果没有找到，会被置于终点。 </td> 
 </tr> 
 <tr style="border:0px; margin:0px; padding:0px; background-color:rgb(246,244,240)"> 
 <td style="border:1px solid rgb(212,212,212); margin:0px; padding:7px 5px; font-size:1em; vertical-align:top"> 18</td> 
 <td style="border:1px solid rgb(212,212,212); margin:0px; padding:7px 5px; font-size:1em; vertical-align:top"> <p style="border:0px; margin-top:0px; margin-bottom:0px; padding-top:0px; padding-bottom:0px; line-height:2em; font-family:&quot;Microsoft Yahei&quot;,&quot;Helvetica Neue&quot;,Helvetica,Arial,sans-serif"> def flatMap[B](f: (A) =&gt; GenTraversableOnce[B]): Iterator[B] <p style="border:0px; margin-top:0px; margin-bottom:0px; padding-top:0px; padding-bottom:0px; line-height:2em; font-family:&quot;Microsoft Yahei&quot;,&quot;Helvetica Neue&quot;,Helvetica,Arial,sans-serif"> 针对迭代器的序列中的每个元素应用函数f，并返回指向结果序列的迭代器。 </td> 
 </tr> 
 <tr style="border:0px; margin:0px; padding:0px"> 
 <td style="border:1px solid rgb(212,212,212); margin:0px; padding:7px 5px; font-size:1em; vertical-align:top"> 19</td> 
 <td style="border:1px solid rgb(212,212,212); margin:0px; padding:7px 5px; font-size:1em; vertical-align:top"> <p style="border:0px; margin-top:0px; margin-bottom:0px; padding-top:0px; padding-bottom:0px; line-height:2em; font-family:&quot;Microsoft Yahei&quot;,&quot;Helvetica Neue&quot;,Helvetica,Arial,sans-serif"> def forall(p: (A) =&gt; Boolean): Boolean <p style="border:0px; margin-top:0px; margin-bottom:0px; padding-top:0px; padding-bottom:0px; line-height:2em; font-family:&quot;Microsoft Yahei&quot;,&quot;Helvetica Neue&quot;,Helvetica,Arial,sans-serif"> 返回一个布尔值，指明 it 所指元素是否都满足p。 </td> 
 </tr> 
 <tr style="border:0px; margin:0px; padding:0px; background-color:rgb(246,244,240)"> 
 <td style="border:1px solid rgb(212,212,212); margin:0px; padding:7px 5px; font-size:1em; vertical-align:top"> 20</td> 
 <td style="border:1px solid rgb(212,212,212); margin:0px; padding:7px 5px; font-size:1em; vertical-align:top"> <p style="border:0px; margin-top:0px; margin-bottom:0px; padding-top:0px; padding-bottom:0px; line-height:2em; font-family:&quot;Microsoft Yahei&quot;,&quot;Helvetica Neue&quot;,Helvetica,Arial,sans-serif"> def foreach(f: (A) =&gt; Unit): Unit <p style="border:0px; margin-top:0px; margin-bottom:0px; padding-top:0px; padding-bottom:0px; line-height:2em; font-family:&quot;Microsoft Yahei&quot;,&quot;Helvetica Neue&quot;,Helvetica,Arial,sans-serif"> 在迭代器返回的每个元素上执行指定的程序 f </td> 
 </tr> 
 <tr style="border:0px; margin:0px; padding:0px"> 
 <td style="border:1px solid rgb(212,212,212); margin:0px; padding:7px 5px; font-size:1em; vertical-align:top"> 21</td> 
 <td style="border:1px solid rgb(212,212,212); margin:0px; padding:7px 5px; font-size:1em; vertical-align:top"> <p style="border:0px; margin-top:0px; margin-bottom:0px; padding-top:0px; padding-bottom:0px; line-height:2em; font-family:&quot;Microsoft Yahei&quot;,&quot;Helvetica Neue&quot;,Helvetica,Arial,sans-serif"> def hasDefiniteSize: Boolean <p style="border:0px; margin-top:0px; margin-bottom:0px; padding-top:0px; padding-bottom:0px; line-height:2em; font-family:&quot;Microsoft Yahei&quot;,&quot;Helvetica Neue&quot;,Helvetica,Arial,sans-serif"> 如果迭代器的元素个数有限则返回true（缺省等同于isEmpty） </td> 
 </tr> 
 <tr style="border:0px; margin:0px; padding:0px; background-color:rgb(246,244,240)"> 
 <td style="border:1px solid rgb(212,212,212); margin:0px; padding:7px 5px; font-size:1em; vertical-align:top"> 22</td> 
 <td style="border:1px solid rgb(212,212,212); margin:0px; padding:7px 5px; font-size:1em; vertical-align:top"> <p style="border:0px; margin-top:0px; margin-bottom:0px; padding-top:0px; padding-bottom:0px; line-height:2em; font-family:&quot;Microsoft Yahei&quot;,&quot;Helvetica Neue&quot;,Helvetica,Arial,sans-serif"> def indexOf(elem: B): Int <p style="border:0px; margin-top:0px; margin-bottom:0px; padding-top:0px; padding-bottom:0px; line-height:2em; font-family:&quot;Microsoft Yahei&quot;,&quot;Helvetica Neue&quot;,Helvetica,Arial,sans-serif"> 返回迭代器的元素中index等于x的第一个元素。注意：迭代器会越过这个元素。 </td> 
 </tr> 
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 <td style="border:1px solid rgb(212,212,212); margin:0px; padding:7px 5px; font-size:1em; vertical-align:top"> 23</td> 
 <td style="border:1px solid rgb(212,212,212); margin:0px; padding:7px 5px; font-size:1em; vertical-align:top"> <p style="border:0px; margin-top:0px; margin-bottom:0px; padding-top:0px; padding-bottom:0px; line-height:2em; font-family:&quot;Microsoft Yahei&quot;,&quot;Helvetica Neue&quot;,Helvetica,Arial,sans-serif"> def indexWhere(p: (A) =&gt; Boolean): Int <p style="border:0px; margin-top:0px; margin-bottom:0px; padding-top:0px; padding-bottom:0px; line-height:2em; font-family:&quot;Microsoft Yahei&quot;,&quot;Helvetica Neue&quot;,Helvetica,Arial,sans-serif"> 返回迭代器的元素中下标满足条件p的元素。注意：迭代器会越过这个元素。 </td> 
 </tr> 
 <tr style="border:0px; margin:0px; padding:0px; background-color:rgb(246,244,240)"> 
 <td style="border:1px solid rgb(212,212,212); margin:0px; padding:7px 5px; font-size:1em; vertical-align:top"> 24</td> 
 <td style="border:1px solid rgb(212,212,212); margin:0px; padding:7px 5px; font-size:1em; vertical-align:top"> <p style="border:0px; margin-top:0px; margin-bottom:0px; padding-top:0px; padding-bottom:0px; line-height:2em; font-family:&quot;Microsoft Yahei&quot;,&quot;Helvetica Neue&quot;,Helvetica,Arial,sans-serif"> def isEmpty: Boolean <p style="border:0px; margin-top:0px; margin-bottom:0px; padding-top:0px; padding-bottom:0px; line-height:2em; font-family:&quot;Microsoft Yahei&quot;,&quot;Helvetica Neue&quot;,Helvetica,Arial,sans-serif"> 检查it是否为空, 为空返回 true，否则返回false（与hasNext相反）。 </td> 
 </tr> 
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 <td style="border:1px solid rgb(212,212,212); margin:0px; padding:7px 5px; font-size:1em; vertical-align:top"> 25</td> 
 <td style="border:1px solid rgb(212,212,212); margin:0px; padding:7px 5px; font-size:1em; vertical-align:top"> <p style="border:0px; margin-top:0px; margin-bottom:0px; padding-top:0px; padding-bottom:0px; line-height:2em; font-family:&quot;Microsoft Yahei&quot;,&quot;Helvetica Neue&quot;,Helvetica,Arial,sans-serif"> def isTraversableAgain: Boolean <p style="border:0px; margin-top:0px; margin-bottom:0px; padding-top:0px; padding-bottom:0px; line-height:2em; font-family:&quot;Microsoft Yahei&quot;,&quot;Helvetica Neue&quot;,Helvetica,Arial,sans-serif"> Tests whether this Iterator can be repeatedly traversed. </td> 
 </tr> 
 <tr style="border:0px; margin:0px; padding:0px; background-color:rgb(246,244,240)"> 
 <td style="border:1px solid rgb(212,212,212); margin:0px; padding:7px 5px; font-size:1em; vertical-align:top"> 26</td> 
 <td style="border:1px solid rgb(212,212,212); margin:0px; padding:7px 5px; font-size:1em; vertical-align:top"> <p style="border:0px; margin-top:0px; margin-bottom:0px; padding-top:0px; padding-bottom:0px; line-height:2em; font-family:&quot;Microsoft Yahei&quot;,&quot;Helvetica Neue&quot;,Helvetica,Arial,sans-serif"> def length: Int <p style="border:0px; margin-top:0px; margin-bottom:0px; padding-top:0px; padding-bottom:0px; line-height:2em; font-family:&quot;Microsoft Yahei&quot;,&quot;Helvetica Neue&quot;,Helvetica,Arial,sans-serif"> 返回迭代器元素的数量。 </td> 
 </tr> 
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 <td style="border:1px solid rgb(212,212,212); margin:0px; padding:7px 5px; font-size:1em; vertical-align:top"> 27</td> 
 <td style="border:1px solid rgb(212,212,212); margin:0px; padding:7px 5px; font-size:1em; vertical-align:top"> <p style="border:0px; margin-top:0px; margin-bottom:0px; padding-top:0px; padding-bottom:0px; line-height:2em; font-family:&quot;Microsoft Yahei&quot;,&quot;Helvetica Neue&quot;,Helvetica,Arial,sans-serif"> def map[B](f: (A) =&gt; B): Iterator[B] <p style="border:0px; margin-top:0px; margin-bottom:0px; padding-top:0px; padding-bottom:0px; line-height:2em; font-family:&quot;Microsoft Yahei&quot;,&quot;Helvetica Neue&quot;,Helvetica,Arial,sans-serif"> 将 it 中的每个元素传入函数 f 后的结果生成新的迭代器。 </td> 
 </tr> 
 <tr style="border:0px; margin:0px; padding:0px; background-color:rgb(246,244,240)"> 
 <td style="border:1px solid rgb(212,212,212); margin:0px; padding:7px 5px; font-size:1em; vertical-align:top"> 28</td> 
 <td style="border:1px solid rgb(212,212,212); margin:0px; padding:7px 5px; font-size:1em; vertical-align:top"> <p style="border:0px; margin-top:0px; margin-bottom:0px; padding-top:0px; padding-bottom:0px; line-height:2em; font-family:&quot;Microsoft Yahei&quot;,&quot;Helvetica Neue&quot;,Helvetica,Arial,sans-serif"> def max: A <p style="border:0px; margin-top:0px; margin-bottom:0px; padding-top:0px; padding-bottom:0px; line-height:2em; font-family:&quot;Microsoft Yahei&quot;,&quot;Helvetica Neue&quot;,Helvetica,Arial,sans-serif"> 返回迭代器迭代器元素中最大的元素。 </td> 
 </tr> 
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 <td style="border:1px solid rgb(212,212,212); margin:0px; padding:7px 5px; font-size:1em; vertical-align:top"> 29</td> 
 <td style="border:1px solid rgb(212,212,212); margin:0px; padding:7px 5px; font-size:1em; vertical-align:top"> <p style="border:0px; margin-top:0px; margin-bottom:0px; padding-top:0px; padding-bottom:0px; line-height:2em; font-family:&quot;Microsoft Yahei&quot;,&quot;Helvetica Neue&quot;,Helvetica,Arial,sans-serif"> def min: A <p style="border:0px; margin-top:0px; margin-bottom:0px; padding-top:0px; padding-bottom:0px; line-height:2em; font-family:&quot;Microsoft Yahei&quot;,&quot;Helvetica Neue&quot;,Helvetica,Arial,sans-serif"> 返回迭代器迭代器元素中最小的元素。 </td> 
 </tr> 
 <tr style="border:0px; margin:0px; padding:0px; background-color:rgb(246,244,240)"> 
 <td style="border:1px solid rgb(212,212,212); margin:0px; padding:7px 5px; font-size:1em; vertical-align:top"> 30</td> 
 <td style="border:1px solid rgb(212,212,212); margin:0px; padding:7px 5px; font-size:1em; vertical-align:top"> <p style="border:0px; margin-top:0px; margin-bottom:0px; padding-top:0px; padding-bottom:0px; line-height:2em; font-family:&quot;Microsoft Yahei&quot;,&quot;Helvetica Neue&quot;,Helvetica,Arial,sans-serif"> def mkString: String <p style="border:0px; margin-top:0px; margin-bottom:0px; padding-top:0px; padding-bottom:0px; line-height:2em; font-family:&quot;Microsoft Yahei&quot;,&quot;Helvetica Neue&quot;,Helvetica,Arial,sans-serif"> 将迭代器所有元素转换成字符串。 </td> 
 </tr> 
 <tr style="border:0px; margin:0px; padding:0px"> 
 <td style="border:1px solid rgb(212,212,212); margin:0px; padding:7px 5px; font-size:1em; vertical-align:top"> 31</td> 
 <td style="border:1px solid rgb(212,212,212); margin:0px; padding:7px 5px; font-size:1em; vertical-align:top"> <p style="border:0px; margin-top:0px; margin-bottom:0px; padding-top:0px; padding-bottom:0px; line-height:2em; font-family:&quot;Microsoft Yahei&quot;,&quot;Helvetica Neue&quot;,Helvetica,Arial,sans-serif"> def mkString(sep: String): String <p style="border:0px; margin-top:0px; margin-bottom:0px; padding-top:0px; padding-bottom:0px; line-height:2em; font-family:&quot;Microsoft Yahei&quot;,&quot;Helvetica Neue&quot;,Helvetica,Arial,sans-serif"> 将迭代器所有元素转换成字符串，并指定分隔符。 </td> 
 </tr> 
 <tr style="border:0px; margin:0px; padding:0px; background-color:rgb(246,244,240)"> 
 <td style="border:1px solid rgb(212,212,212); margin:0px; padding:7px 5px; font-size:1em; vertical-align:top"> 32</td> 
 <td style="border:1px solid rgb(212,212,212); margin:0px; padding:7px 5px; font-size:1em; vertical-align:top"> <p style="border:0px; margin-top:0px; margin-bottom:0px; padding-top:0px; padding-bottom:0px; line-height:2em; font-family:&quot;Microsoft Yahei&quot;,&quot;Helvetica Neue&quot;,Helvetica,Arial,sans-serif"> def nonEmpty: Boolean <p style="border:0px; margin-top:0px; margin-bottom:0px; padding-top:0px; padding-bottom:0px; line-height:2em; font-family:&quot;Microsoft Yahei&quot;,&quot;Helvetica Neue&quot;,Helvetica,Arial,sans-serif"> 检查容器中是否包含元素（相当于 hasNext）。 </td> 
 </tr> 
 <tr style="border:0px; margin:0px; padding:0px"> 
 <td style="border:1px solid rgb(212,212,212); margin:0px; padding:7px 5px; font-size:1em; vertical-align:top"> 33</td> 
 <td style="border:1px solid rgb(212,212,212); margin:0px; padding:7px 5px; font-size:1em; vertical-align:top"> <p style="border:0px; margin-top:0px; margin-bottom:0px; padding-top:0px; padding-bottom:0px; line-height:2em; font-family:&quot;Microsoft Yahei&quot;,&quot;Helvetica Neue&quot;,Helvetica,Arial,sans-serif"> def padTo(len: Int, elem: A): Iterator[A] <p style="border:0px; margin-top:0px; margin-bottom:0px; padding-top:0px; padding-bottom:0px; line-height:2em; font-family:&quot;Microsoft Yahei&quot;,&quot;Helvetica Neue&quot;,Helvetica,Arial,sans-serif"> 首先返回迭代器所有元素，追加拷贝 elem 直到长度达到 len。 </td> 
 </tr> 
 <tr style="border:0px; margin:0px; padding:0px; background-color:rgb(246,244,240)"> 
 <td style="border:1px solid rgb(212,212,212); margin:0px; padding:7px 5px; font-size:1em; vertical-align:top"> 34</td> 
 <td style="border:1px solid rgb(212,212,212); margin:0px; padding:7px 5px; font-size:1em; vertical-align:top"> <p style="border:0px; margin-top:0px; margin-bottom:0px; padding-top:0px; padding-bottom:0px; line-height:2em; font-family:&quot;Microsoft Yahei&quot;,&quot;Helvetica Neue&quot;,Helvetica,Arial,sans-serif"> def patch(from: Int, patchElems: Iterator[B], replaced: Int): Iterator[B] <p style="border:0px; margin-top:0px; margin-bottom:0px; padding-top:0px; padding-bottom:0px; line-height:2em; font-family:&quot;Microsoft Yahei&quot;,&quot;Helvetica Neue&quot;,Helvetica,Arial,sans-serif"> 返回一个新迭代器，其中自第 from 个元素开始的 replaced 个元素被迭代器所指元素替换。 </td> 
 </tr> 
 <tr style="border:0px; margin:0px; padding:0px"> 
 <td style="border:1px solid rgb(212,212,212); margin:0px; padding:7px 5px; font-size:1em; vertical-align:top"> 35</td> 
 <td style="border:1px solid rgb(212,212,212); margin:0px; padding:7px 5px; font-size:1em; vertical-align:top"> <p style="border:0px; margin-top:0px; margin-bottom:0px; padding-top:0px; padding-bottom:0px; line-height:2em; font-family:&quot;Microsoft Yahei&quot;,&quot;Helvetica Neue&quot;,Helvetica,Arial,sans-serif"> def product: A <p style="border:0px; margin-top:0px; margin-bottom:0px; padding-top:0px; padding-bottom:0px; line-height:2em; font-family:&quot;Microsoft Yahei&quot;,&quot;Helvetica Neue&quot;,Helvetica,Arial,sans-serif"> 返回迭代器所指数值型元素的积。 </td> 
 </tr> 
 <tr style="border:0px; margin:0px; padding:0px; background-color:rgb(246,244,240)"> 
 <td style="border:1px solid rgb(212,212,212); margin:0px; padding:7px 5px; font-size:1em; vertical-align:top"> 36</td> 
 <td style="border:1px solid rgb(212,212,212); margin:0px; padding:7px 5px; font-size:1em; vertical-align:top"> <p style="border:0px; margin-top:0px; margin-bottom:0px; padding-top:0px; padding-bottom:0px; line-height:2em; font-family:&quot;Microsoft Yahei&quot;,&quot;Helvetica Neue&quot;,Helvetica,Arial,sans-serif"> def sameElements(that: Iterator[_]): Boolean <p style="border:0px; margin-top:0px; margin-bottom:0px; padding-top:0px; padding-bottom:0px; line-height:2em; font-family:&quot;Microsoft Yahei&quot;,&quot;Helvetica Neue&quot;,Helvetica,Arial,sans-serif"> 判断迭代器和指定的迭代器参数是否依次返回相同元素 </td> 
 </tr> 
 <tr style="border:0px; margin:0px; padding:0px"> 
 <td style="border:1px solid rgb(212,212,212); margin:0px; padding:7px 5px; font-size:1em; vertical-align:top"> 37</td> 
 <td style="border:1px solid rgb(212,212,212); margin:0px; padding:7px 5px; font-size:1em; vertical-align:top"> <p style="border:0px; margin-top:0px; margin-bottom:0px; padding-top:0px; padding-bottom:0px; line-height:2em; font-family:&quot;Microsoft Yahei&quot;,&quot;Helvetica Neue&quot;,Helvetica,Arial,sans-serif"> def seq: Iterator[A] <p style="border:0px; margin-top:0px; margin-bottom:0px; padding-top:0px; padding-bottom:0px; line-height:2em; font-family:&quot;Microsoft Yahei&quot;,&quot;Helvetica Neue&quot;,Helvetica,Arial,sans-serif"> 返回集合的系列视图 </td> 
 </tr> 
 <tr style="border:0px; margin:0px; padding:0px; background-color:rgb(246,244,240)"> 
 <td style="border:1px solid rgb(212,212,212); margin:0px; padding:7px 5px; font-size:1em; vertical-align:top"> 38</td> 
 <td style="border:1px solid rgb(212,212,212); margin:0px; padding:7px 5px; font-size:1em; vertical-align:top"> <p style="border:0px; margin-top:0px; margin-bottom:0px; padding-top:0px; padding-bottom:0px; line-height:2em; font-family:&quot;Microsoft Yahei&quot;,&quot;Helvetica Neue&quot;,Helvetica,Arial,sans-serif"> def size: Int <p style="border:0px; margin-top:0px; margin-bottom:0px; padding-top:0px; padding-bottom:0px; line-height:2em; font-family:&quot;Microsoft Yahei&quot;,&quot;Helvetica Neue&quot;,Helvetica,Arial,sans-serif"> 返回迭代器的元素数量 </td> 
 </tr> 
 <tr style="border:0px; margin:0px; padding:0px"> 
 <td style="border:1px solid rgb(212,212,212); margin:0px; padding:7px 5px; font-size:1em; vertical-align:top"> 39</td> 
 <td style="border:1px solid rgb(212,212,212); margin:0px; padding:7px 5px; font-size:1em; vertical-align:top"> <p style="border:0px; margin-top:0px; margin-bottom:0px; padding-top:0px; padding-bottom:0px; line-height:2em; font-family:&quot;Microsoft Yahei&quot;,&quot;Helvetica Neue&quot;,Helvetica,Arial,sans-serif"> def slice(from: Int, until: Int): Iterator[A] <p style="border:0px; margin-top:0px; margin-bottom:0px; padding-top:0px; padding-bottom:0px; line-height:2em; font-family:&quot;Microsoft Yahei&quot;,&quot;Helvetica Neue&quot;,Helvetica,Arial,sans-serif"> 返回一个新的迭代器，指向迭代器所指向的序列中从开始于第 from 个元素、结束于第 until 个元素的片段。 </td> 
 </tr> 
 <tr style="border:0px; margin:0px; padding:0px; background-color:rgb(246,244,240)"> 
 <td style="border:1px solid rgb(212,212,212); margin:0px; padding:7px 5px; font-size:1em; vertical-align:top"> 40</td> 
 <td style="border:1px solid rgb(212,212,212); margin:0px; padding:7px 5px; font-size:1em; vertical-align:top"> <p style="border:0px; margin-top:0px; margin-bottom:0px; padding-top:0px; padding-bottom:0px; line-height:2em; font-family:&quot;Microsoft Yahei&quot;,&quot;Helvetica Neue&quot;,Helvetica,Arial,sans-serif"> def sum: A <p style="border:0px; margin-top:0px; margin-bottom:0px; padding-top:0px; padding-bottom:0px; line-height:2em; font-family:&quot;Microsoft Yahei&quot;,&quot;Helvetica Neue&quot;,Helvetica,Arial,sans-serif"> 返回迭代器所指数值型元素的和 </td> 
 </tr> 
 <tr style="border:0px; margin:0px; padding:0px"> 
 <td style="border:1px solid rgb(212,212,212); margin:0px; padding:7px 5px; font-size:1em; vertical-align:top"> 41</td> 
 <td style="border:1px solid rgb(212,212,212); margin:0px; padding:7px 5px; font-size:1em; vertical-align:top"> <p style="border:0px; margin-top:0px; margin-bottom:0px; padding-top:0px; padding-bottom:0px; line-height:2em; font-family:&quot;Microsoft Yahei&quot;,&quot;Helvetica Neue&quot;,Helvetica,Arial,sans-serif"> def take(n: Int): Iterator[A] <p style="border:0px; margin-top:0px; margin-bottom:0px; padding-top:0px; padding-bottom:0px; line-height:2em; font-family:&quot;Microsoft Yahei&quot;,&quot;Helvetica Neue&quot;,Helvetica,Arial,sans-serif"> 返回前 n 个元素的新迭代器。 </td> 
 </tr> 
 <tr style="border:0px; margin:0px; padding:0px; background-color:rgb(246,244,240)"> 
 <td style="border:1px solid rgb(212,212,212); margin:0px; padding:7px 5px; font-size:1em; vertical-align:top"> 42</td> 
 <td style="border:1px solid rgb(212,212,212); margin:0px; padding:7px 5px; font-size:1em; vertical-align:top"> <p style="border:0px; margin-top:0px; margin-bottom:0px; padding-top:0px; padding-bottom:0px; line-height:2em; font-family:&quot;Microsoft Yahei&quot;,&quot;Helvetica Neue&quot;,Helvetica,Arial,sans-serif"> def toArray: Array[A] <p style="border:0px; margin-top:0px; margin-bottom:0px; padding-top:0px; padding-bottom:0px; line-height:2em; font-family:&quot;Microsoft Yahei&quot;,&quot;Helvetica Neue&quot;,Helvetica,Arial,sans-serif"> 将迭代器指向的所有元素归入数组并返回。 </td> 
 </tr> 
 <tr style="border:0px; margin:0px; padding:0px"> 
 <td style="border:1px solid rgb(212,212,212); margin:0px; padding:7px 5px; font-size:1em; vertical-align:top"> 43</td> 
 <td style="border:1px solid rgb(212,212,212); margin:0px; padding:7px 5px; font-size:1em; vertical-align:top"> <p style="border:0px; margin-top:0px; margin-bottom:0px; padding-top:0px; padding-bottom:0px; line-height:2em; font-family:&quot;Microsoft Yahei&quot;,&quot;Helvetica Neue&quot;,Helvetica,Arial,sans-serif"> def toBuffer: Buffer[B] <p style="border:0px; margin-top:0px; margin-bottom:0px; padding-top:0px; padding-bottom:0px; line-height:2em; font-family:&quot;Microsoft Yahei&quot;,&quot;Helvetica Neue&quot;,Helvetica,Arial,sans-serif"> 将迭代器指向的所有元素拷贝至缓冲区 Buffer。 </td> 
 </tr> 
 <tr style="border:0px; margin:0px; padding:0px; background-color:rgb(246,244,240)"> 
 <td style="border:1px solid rgb(212,212,212); margin:0px; padding:7px 5px; font-size:1em; vertical-align:top"> 44</td> 
 <td style="border:1px solid rgb(212,212,212); margin:0px; padding:7px 5px; font-size:1em; vertical-align:top"> <p style="border:0px; margin-top:0px; margin-bottom:0px; padding-top:0px; padding-bottom:0px; line-height:2em; font-family:&quot;Microsoft Yahei&quot;,&quot;Helvetica Neue&quot;,Helvetica,Arial,sans-serif"> def toIterable: Iterable[A] <p style="border:0px; margin-top:0px; margin-bottom:0px; padding-top:0px; padding-bottom:0px; line-height:2em; font-family:&quot;Microsoft Yahei&quot;,&quot;Helvetica Neue&quot;,Helvetica,Arial,sans-serif"> Returns an Iterable containing all elements of this traversable or iterator. This will not terminate for infinite iterators. </td> 
 </tr> 
 <tr style="border:0px; margin:0px; padding:0px"> 
 <td style="border:1px solid rgb(212,212,212); margin:0px; padding:7px 5px; font-size:1em; vertical-align:top"> 45</td> 
 <td style="border:1px solid rgb(212,212,212); margin:0px; padding:7px 5px; font-size:1em; vertical-align:top"> <p style="border:0px; margin-top:0px; margin-bottom:0px; padding-top:0px; padding-bottom:0px; line-height:2em; font-family:&quot;Microsoft Yahei&quot;,&quot;Helvetica Neue&quot;,Helvetica,Arial,sans-serif"> def toIterator: Iterator[A] <p style="border:0px; margin-top:0px; margin-bottom:0px; padding-top:0px; padding-bottom:0px; line-height:2em; font-family:&quot;Microsoft Yahei&quot;,&quot;Helvetica Neue&quot;,Helvetica,Arial,sans-serif"> 把迭代器的所有元素归入一个Iterator容器并返回。 </td> 
 </tr> 
 <tr style="border:0px; margin:0px; padding:0px; background-color:rgb(246,244,240)"> 
 <td style="border:1px solid rgb(212,212,212); margin:0px; padding:7px 5px; font-size:1em; vertical-align:top"> 46</td> 
 <td style="border:1px solid rgb(212,212,212); margin:0px; padding:7px 5px; font-size:1em; vertical-align:top"> <p style="border:0px; margin-top:0px; margin-bottom:0px; padding-top:0px; padding-bottom:0px; line-height:2em; font-family:&quot;Microsoft Yahei&quot;,&quot;Helvetica Neue&quot;,Helvetica,Arial,sans-serif"> def toList: List[A] <p style="border:0px; margin-top:0px; margin-bottom:0px; padding-top:0px; padding-bottom:0px; line-height:2em; font-family:&quot;Microsoft Yahei&quot;,&quot;Helvetica Neue&quot;,Helvetica,Arial,sans-serif"> 把迭代器的所有元素归入列表并返回 </td> 
 </tr> 
 <tr style="border:0px; margin:0px; padding:0px"> 
 <td style="border:1px solid rgb(212,212,212); margin:0px; padding:7px 5px; font-size:1em; vertical-align:top"> 47</td> 
 <td style="border:1px solid rgb(212,212,212); margin:0px; padding:7px 5px; font-size:1em; vertical-align:top"> <p style="border:0px; margin-top:0px; margin-bottom:0px; padding-top:0px; padding-bottom:0px; line-height:2em; font-family:&quot;Microsoft Yahei&quot;,&quot;Helvetica Neue&quot;,Helvetica,Arial,sans-serif"> def toMap[T, U]: Map[T, U] <p style="border:0px; margin-top:0px; margin-bottom:0px; padding-top:0px; padding-bottom:0px; line-height:2em; font-family:&quot;Microsoft Yahei&quot;,&quot;Helvetica Neue&quot;,Helvetica,Arial,sans-serif"> 将迭代器的所有键值对归入一个Map并返回。 </td> 
 </tr> 
 <tr style="border:0px; margin:0px; padding:0px; background-color:rgb(246,244,240)"> 
 <td style="border:1px solid rgb(212,212,212); margin:0px; padding:7px 5px; font-size:1em; vertical-align:top"> 48</td> 
 <td style="border:1px solid rgb(212,212,212); margin:0px; padding:7px 5px; font-size:1em; vertical-align:top"> <p style="border:0px; margin-top:0px; margin-bottom:0px; padding-top:0px; padding-bottom:0px; line-height:2em; font-family:&quot;Microsoft Yahei&quot;,&quot;Helvetica Neue&quot;,Helvetica,Arial,sans-serif"> def toSeq: Seq[A] <p style="border:0px; margin-top:0px; margin-bottom:0px; padding-top:0px; padding-bottom:0px; line-height:2em; font-family:&quot;Microsoft Yahei&quot;,&quot;Helvetica Neue&quot;,Helvetica,Arial,sans-serif"> 将代器的所有元素归入一个Seq容器并返回。 </td> 
 </tr> 
 <tr style="border:0px; margin:0px; padding:0px"> 
 <td style="border:1px solid rgb(212,212,212); margin:0px; padding:7px 5px; font-size:1em; vertical-align:top"> 49</td> 
 <td style="border:1px solid rgb(212,212,212); margin:0px; padding:7px 5px; font-size:1em; vertical-align:top"> <p style="border:0px; margin-top:0px; margin-bottom:0px; padding-top:0px; padding-bottom:0px; line-height:2em; font-family:&quot;Microsoft Yahei&quot;,&quot;Helvetica Neue&quot;,Helvetica,Arial,sans-serif"> def toString(): String <p style="border:0px; margin-top:0px; margin-bottom:0px; padding-top:0px; padding-bottom:0px; line-height:2em; font-family:&quot;Microsoft Yahei&quot;,&quot;Helvetica Neue&quot;,Helvetica,Arial,sans-serif"> 将迭代器转换为字符串 </td> 
 </tr> 
 <tr style="border:0px; margin:0px; padding:0px; background-color:rgb(246,244,240)"> 
 <td style="border:1px solid rgb(212,212,212); margin:0px; padding:7px 5px; font-size:1em; vertical-align:top"> 50</td> 
 <td style="border:1px solid rgb(212,212,212); margin:0px; padding:7px 5px; font-size:1em; vertical-align:top"> <p style="border:0px; margin-top:0px; margin-bottom:0px; padding-top:0px; padding-bottom:0px; line-height:2em; font-family:&quot;Microsoft Yahei&quot;,&quot;Helvetica Neue&quot;,Helvetica,Arial,sans-serif"> def zip[B](that: Iterator[B]): Iterator[(A, B) <p style="border:0px; margin-top:0px; margin-bottom:0px; padding-top:0px; padding-bottom:0px; line-height:2em; font-family:&quot;Microsoft Yahei&quot;,&quot;Helvetica Neue&quot;,Helvetica,Arial,sans-serif"> 返回一个新迭代器，指向分别由迭代器和指定的迭代器 that 元素一一对应而成的二元组序列 </td> 
 </tr> 
 </tbody> 
</table>