如何使用Java中的Scanner类读取单个字符？

2024-05-02 15:24:04 312

使用Scanner类读取字符

Scanner类提供nextXXX()（其中xxx是int，float，boolean等）方法，这些方法用于读取各种原始数据类型。但是它从来没有提供读取单个字符的方法。

但是，您仍然可以使用此类读取单个字符。

next()Scanner类的方法以String格式返回源的下一个标记。这会将单个字符（由定界符分隔）读取为字符串。

String str = sc.next();

toCharArray()String类的方法将当前String转换为字符数组。

char ch[] = str.toCharArray()

从数组中可以获取存储在第0个位置的字符。

char myChar = ch[0];

示例

以下示例使用Scanner类从用户读取单个字符。

import java.util.Scanner;
public class ContentsOfFile {
   public static void main(String args[]) throws Exception {
      //创建扫描仪对象
      Scanner sc = new Scanner(System.in);
      //创建一个StringBuffer对象
      System.out.println("Enter your grade: (A, B, C, D)");
      char grade = sc.next().toCharArray()[0];
      if(grade == 'A'){
         System.out.println("You are very good, you have been promoted");
      }else if(grade=='B'){
         System.out.println("You are good, you have been promoted");
      }else if(grade=='C'){
         System.out.println("You are average, you have been " + "promoted, you need to work hard");
      }else if(grade=='D'){
         System.out.println("You are not promoted, try again");
      }else {
         System.out.println("Improper input");
      }
   }
}

输出结果

Enter your grade: (A, B, C, D)
C
You are average, you have been promoted, you need to work hard

如何使用Java中的Scanner类读取单个字符？

使用Scanner类读取字符

示例

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