java java中的nextChar()
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nextChar() in java
提问by hedgehogrider
If I'm taking input with a scanner and I want to put a single character into a char type variable, what is the most efficient algorithm? I just noticed that both next() and nextLine() return strings regardless of the size, and aside from getting a string, casting it into a char array and then taking the first element, I can't think of how I would do this. There must be a more efficient way!
如果我使用扫描仪输入并且想将单个字符放入 char 类型变量中，那么最有效的算法是什么？我只是注意到 next() 和 nextLine() 无论大小都返回字符串，除了获取字符串，将其转换为 char 数组然后获取第一个元素之外，我想不出我将如何做到这一点. 必须有更有效的方法！
回答by jluzwick
You could use FileChannelto create a ByteBuffer. Once here you can then call the asCharBuffer()method to return a char buffer.
您可以使用FileChannel创建一个ByteBuffer. asCharBuffer()到达此处后，您可以调用该方法以返回字符缓冲区。
Here's a decent example: Example using CharBuffers
这是一个不错的例子： Example using CharBuffers
回答by Bhanu
To read a character from input you can use the builtin function char charAt():
要从输入中读取字符，您可以使用内置函数char charAt()：
import java.util.Scanner;
Scanner sc = new Scanner(System.in);
char c = sc.next().charAt(0)
