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AlejandroR
Asked: 2022-07-29 00:06:31 +0800 CST 2022-07-29 00:06:31 +0800 CST

java.time TextStyle import not working

  • 772

I want to extract the month from a full date (DD/MM/YYYY). I have found a way to do it:

int mes = cal.get(Calendar.MONTH);
String nombreMes = mes.getDisplayName(TextStyle.FULL, new Locale("es", 
"ES"));

But it gives me problems with the TextStyle of java.time : it doesn't pick up the import.

Should we add any dependencies in the pom.xml to be able to work with the java.time elements ? If so, can you provide me with the dependency to add in the pom.xml ?

java

1 Answers

  1. Best Answer

    From what I can see, your first error should be the name of the variable mes, because the variable int mesmust not have the method getDisplayNamethat would belong to the variable Calendar cal; another error is that TextStyle.FULLit is not the class you should use: you should use Calendar.LONG. TestStyleIt works but for the class java.time.Month;, in this case for your example it is not necessary since it would involve extra steps to convert the month to Monthand then get the name.

    I leave you an example with the 2 ways to obtain the name of the month using Calendar and Month:

    import java.util.Calendar;
import java.util.GregorianCalendar;
import java.util.Locale;

public class NombreMesUsandoCalendar {
    public static void main(String[] args) {
        Calendar cal = GregorianCalendar.getInstance();
        // Obtenemos el nombre del mes utilizando el método `getDisplayName` correctamente.
        String nombreMes = cal.getDisplayName(Calendar.MONTH, Calendar.LONG, new Locale("es", "ES"));
        System.out.println(nombreMes);
    }
}

Texto de ejecución en consola:
julio 

    
import java.time.Month;
import java.time.format.TextStyle;
import java.util.Calendar;
import java.util.GregorianCalendar;
import java.util.Locale;

public class NombreMesUsandoMonth {
    public static void main(String[] args) {
        Calendar cal = GregorianCalendar.getInstance();
        // Obtenemos el numero del mes
        int numeroMes = cal.get(Calendar.MONTH);
        // Pasamos el numero del mes a la Clase Month
        Month mes = Month.of(numeroMes + 1);
        // Obtenemos el nombre del mes de la variable mes de tipo Month
        String nombreMes = mes.getDisplayName(TextStyle.FULL, new Locale("es", "ES"));

        System.out.println(nombreMes);
    }
}

Texto de ejecución en consola:
julio

    Something to keep in mind is that the class Calendarbelongs to the package java.utiland has many design errors: for example the number of the month Calendarstarts at zero (0=January, 1=February ... 11=December) which is not intuitive .

    The class Monthis from the package java.timewas introduced in Java 8, correcting the problems of Calendarand java.util.Date, so you must add 1 to get the correct month Month.of(numeroMes + 1);because January is 1 in java.time. The best thing is that you stop using Calendarit if possible and that you use the classes of java.timeonly, they would be Instant, LocalDate y LocalDateTimefor the handling of date and time.

    • 3