学习Java. 基础 6: Java中Scanner的使用

怼烎@ 2023-02-24 11:08 4阅读 0赞

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# Scanner #

*  解释: scanner对象是个工具,接收控制台输入的信息
 *  所属包: java.util
 *  创建对象方式(特殊): Scanner sc = new Scanner(System.in);

###### 常用方法: ######

<table> 
 <thead> 
  <tr> 
   <th>方法名</th> 
   <th>方法说明</th> 
  </tr> 
 </thead> 
 <tbody> 
  <tr> 
   <td>nextInt()</td> 
   <td>接收一个整数，返回这个整数。返回值：int。 注：若输入的内容非整数，程序报错停止</td> 
  </tr> 
  <tr> 
   <td>nextLine()</td> 
   <td>接收一行字符串，返回这个字符串。返回值：String</td> 
  </tr> 
  <tr> 
   <td>nextDouble()</td> 
   <td>接收一个小数，返回这个小数。回值：double。注：若输入的内容非数字，程序报错停止</td> 
  </tr> 
 </tbody> 
</table>

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*  注意：

1.  nextInt、nextDouble不能与nextLine混用。
2.  创建一个Scanner变量要么仅调用nextInt或nextDouble方法，
3.  要么仅调用调用nextLine方法。

![up-42fdc9b57f0fe0b080b5c81d40ab6685a8c.png][]

![up-7e9a30a927c36d13cb92d976bd90d2d9274.png][]

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