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toledano
Asked: 2020-04-26 11:35:44 +0800 CST 2020-04-26 11:35:44 +0800 CST

Return a formatted string

  • 772

I'm creating a function that converts minutes to hours and minutes, but I'm doing it this way:

public String duracion(int tiempo) {
  int horas = tiempo / 60;
  int minutos = tiempo % 60;
  return horas + " hrs. " + minutos + " min.";
}

what I want is to return this string:

  return ("%d:%02d", horas, minutos);

But I get the error:

Syntax error on token "return", Name expected after this token

But if I use the expression ("%d:%02d", horas, minutos)with System.out.printlnif it works, but I don't want a function void, I want it to return the text string.

java

2 Answers

  1. Best Answer

    First of all, I don't think this will work for you:

    System.out.println("%d:%02d", horas, minutos)

    Since the println method in no case accepts 3 parameters, in any case I assume that you have done it with the methodprintf

    Clarified that, the method duracionreturns a String, and you are returning an expression that is not valid in Java, you are returning 3 things separated by spaces and all of it enclosed in parentheses.

    I understand that you are doing all this to be able to do something like this:

    System.out.printf(duracion(miTiempo));

    The thing is that in Java you can't pass 3 parameters to a function just like that. You have several options.

    You can make several functions, for each parameter that you are going to pass to printf, for example:

    System.out.printf(getPatron(), getHoras(), getMinutos());

    You can also make a function that returns three different things in a list in an array, for example:

    Object[] duracion = getDuracion(miTiempo);
String patron = (String) duracion[0];
Integer hora = (Integer) duracion[1];
Integer minuto = (Integer) duracion[2];
Sysem.out.printf(patron, hora, minuto);

    You can also return an object containing all three parameters:

    public class Duracion {
   private final String patron;
   private final Integer hora;
   private final Integer minuto;
   public Duracion(String patron, Integer hora, Integer minuto) {
      this.duracion = duracion;
      this.hora = hora;
      this.minuto = minuto;
   }
   public String getPatron() {
     return this.hora;
   }
   public Integer getHora() {
     return this.hora;
   }
   public Integer getHora() {
     return this.hora;
   }
}

public Duracion getDuracion(int tiempo) {
  String patron = "%d:%02d";
  int horas = tiempo / 60;
  int minutos = tiempo % 60;
  Duracion duracion = new Duracion(patron, horas, minuts);
  return duracion;
}

Duracion duracion = getDuracion(miTempo);
String patron = duracion.getPatron();
Integer hora = duracion.getHora();
Integer minuto = duracion.getMinuto();
System.out.printf(patron, hora, minuto);

    You can also return the string already formatted, and not call printf, but println:

    public String duracion(int tiempo) {
  int horas = tiempo / 60;
  int minutos = tiempo % 60;
  return String.format("%d:%02d", horas, minutos);
}

System.out.println(duracion(miTiempo));

    The format function works similar to printf, but it doesn't print it directly, it saves it to a string, and then you do whatever you need with it.

    • 2

  2. You are forgetting to use the String.format method

    public static void main(String[] args) {

    String result = duracion(3600*5);
    System.out.println(result);
}

public  static String duracion(int tiempo) {
    int horas = tiempo / 60;
    int minutos = tiempo % 60;
    return String.format("%d:%02d", horas, minutos);
}
    • 1