How to enter data in the same line

If what you want is to enter data in the same line what you have to do is use print no println that will give a jump line when you present the message would be your code so,

public static void main(String[] args)
{
    Scanner sc = new Scanner(System.in);

    System.out.print("Introduce la hora");

    int hora = sc.nextInt();
    System.out.print(":");
    int minutos = sc.nextInt();

    sc.close();
}

If you do not need to handle them later, just go on the screen and try Strings in this way.

public static void main(String[] args)
    {
        Scanner sc = new Scanner(System.in);

        System.out.println("Introduce la hora (HH:MM)");

        String horacompleta=sc.nextLine();
        String minutos=horacompleta.substring(3);
        String hora=horacompleta.substring(0, 2);
        System.out.print(hora+":"+minutos);

        sc.close();
    }

Result:

Introduce la hora (HH:MM)
12:40
12:40

In my opinion, the easiest thing is to indicate to the user the format with which you should enter the time

public static void main(String[] args)
{
    Scanner sc = new Scanner(System.in);

    System.out.println("Introduce la hora (HH:MM) ");

    string horaCompleta = sc.nextLine();
    System.out.println(horaCompleta);

    sc.close();
}

If you then need to have the hour and minute data you have 2 options:

1- As you told the user to enter the time in HH: MM format and save it in a string, you can obtain the data as follows:

int hora = Integer.parseInt(horaCompleta.substring(0, 2));
int minutos = Integer.parseInt(horaCompleta.substring(3));

With that you would already have both data in int format and you can use it in the way you need.

2- The other option is to ask you to enter 2 data instead of one:

public static void main(String[] args)
{
    Scanner sc = new Scanner(System.in);

    System.out.println("Introduce la hora ");
    int hora = sc.nextInt();

    System.out.println("Introduce los minutos ");
    int minutos = sc.nextInt();

    System.out.println(hora + ":" + minutos);

    sc.close();
}

In this way you have the 2 data separately and shows them in the conventional 22:50 format.

I hope it helps you!