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

No is possible to perform in console mode.

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

With the class Scanner we 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 what you enter:

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

I do not remember at all if in this way it prevents you from capturing more than one character, I hope it is of your use.

Yes, it is 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 for showing a message without pressing the intro, it escapes me a little. If I find the form I edit the message and add it. Anyway, I suppose it can be done. With any language you can do anything, even if it is more or less complicated, in the end you take

What you are trying to do I suppose is related to the use of keyboard events . KeyAdapter would help you.

It is advisable to make a new class for the event by extending the KeyAdapter class. To not write all the methods of the KeyListener interface, you could use the keyPressed(KeyEvent e) method. more information .

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 lavariable caracter
char caracter;
//Mensaje al usuario para que introduzca un caracter.
System.out.println("Introducir caracter: ");
caracter = teclado.next().charAt(0);
}
}