How Can I Efficiently Get Single Character Input Using Java's Scanner?

Getting Character Input through Scanner

In programming, it can be necessary to take character input from the keyboard. While Java's Scanner class provides various methods for input, it might not always have an explicit nextChar() method. This raises the question of how to obtain a character input directly.

Solutions:

To address this issue, there are several approaches:

• Extract Character from String:

Scanner reader = new Scanner(System.in);
String input = reader.next();
char c = input.charAt(0);

This method takes the first character from a string input obtained using reader.next(). However, it has limitations and is not fully reliable.

• Use findInLine():

char c = reader.findInLine(".").charAt(0);

This consumes exactly one character, even if it's part of a word or number. It scans for the first occurrence of the dot regular expression, which represents any character.

• Use next("."):

char c = reader.next(".").charAt(0);

This is a stricter version of findInLine(), consuming only one character. It scans for the first occurrence of the dot regular expression, but also treats it as the end of the input.

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