Read single character with Scanner

Question

I want to input a single character of type char in a Java program. Even if the user enters more than one character, it should only take the first. How can I do this? Is it possible with the help of the Scanner class?

Answer 1

There are two ways to do that:

char c = scanner.nextLine().charAt(0);

Which will read the first available line, and extract the first character, or

try {
    char c = (char) System.in.read();
} catch (IOException e) {
    e.printStackTrace();
}

Which will read the first byte in the first available line and cast it to a char

Answer 2

What's wrong with

scanner.next().charAt(0)

---

Or, here's another idea, if you don't want next() to return anything extra:

scanner.useDelimiter("")

Now scanner.next() should return a single character string, and you can use .charAt(0) as needed.

Answer 3

要使用Scanner的单个字符，可以使用：

char ch = scanner.findInLine(".").charAt(0);