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user13558
Asked: 2020-11-28 14:07:48 +0800 CST 2020-11-28 14:07:48 +0800 CST

Is it possible to read a character by keyboard in Java?

  • 772

I would need to know how to read a character by keyboard in Java .

I know that you can read a number, or a phrase, but this time I would like it to read only one character, and the system to show a message, immediately after pressing that character, and not when I touch Intro.

The following code receives an integer, then I hit Intro, and it saves.

Scanner teclado = new Scanner(System.in);
int número = teclado.nextInt();

But what I want is to save a character without pressing the key. It's possible?

java

5 Answers

  1. With the class Scannerwe can find different functions, such as capturing strings, numbers, etc:

    Scanner teclado = new Scanner(System.in);
int número = teclado.nextInt();

    The following takes the first character of whatever you enter:

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

    I do not remember at all if this way prevents you from capturing more than one character, I hope it will be useful to you.

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  2. Best Answer

    It is not possible to perform in console mode.

    For more information you could see the following link in English :

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  3. If possible. I leave you here a little program that asks for a character and then shows it on the screen.

    public static void main(String[] args) {

    Scanner escaneo = new Scanner(System.in);
    System.out.println("Introduzca un carácter: ");
    char caracter;
    caracter = escaneo.next().charAt(0);

    System.out.println(caracter);

}

    As far as displaying a message without pressing enter is a bit beyond me. If I find a way, I edit the message and add it. Anyway, I guess it can be done. With any language you can do anything, even if it is more or less complicated, in the end you get

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  4. Try this:

    // Primero importamos la clase scanner
import java.util.Scanner;

public class NewClass {

    // Definimos el metodo main
    public static void main(String[]args)throws Exception{

        // Declaramos el objeto teclado
        Scanner teclado = new Scanner(System.in);

        // Declaramos la variable caracter
        char caracter;

        // Mensaje al usuario para que introduzca un caracter.
        System.out.println("Introducir caracter: ");

        caracter = teclado.next().charAt(0);
    }
}
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  5. What you are trying to do I assume is related to the use of keyboard events . KeyAdapter would help you.

    It is recommended to make a new class for the event by extending the KeyAdapter class. To avoid writing all the methods of the KeyListener interface, you could use the keyPressed(KeyEvent e). more information .

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