To explain my question better, I need to validate the format of a string of characters, for example:
the user should enter in the text field: 6412365-4 valid that the number is correct by applying module 11.
but I want that if the user enters: 24563254 send me a message because the format should be 0000000-0
How to compare the value entered with the format I need?
These types of problems are better addressed using regular expressions:
import java.util.regex.*;
public class HelloWorld
{
public static void main(String[] args)
{
Pattern patron = Pattern.compile("[0-9]{7}-[0-9]{1}");
Matcher mat = patron.matcher("6412365-4");
if(mat.matches()){
System.out.println("FORMATO CORRECTO");
}else{
System.out.println("FORMATO INCORRECTO");
}
}
}
I recommend you investigate and use them
Hi Joshua your question I do not understand it well, what I understand is that you want the user to enter a value with a format with an established number of numbers and at the end of the last number have "-1". I mean you want the chain 1234567-8 is valid, however the number 12345678 is not valid? The solution would be to apply a JFormatteTextField. Here is a guide how to use it, I hope it helps you. link
Here I leave a complete example, which validates whether or not it contains the format you have above. includes the script and also the size of it.
public class Format {
/**
* @param args the command line arguments
*/
public static void main(String[] args) {
// TODO code application logic here
String dato;
int posicion = 0,size=0;
BufferedReader bf = new BufferedReader(new InputStreamReader(System.in));
try {
System.out.println("ingrese el dato");
dato = bf.readLine();
posicion = dato.indexOf("-");
size = dato.length();
System.out.println("rrr"+posicion+" "+size);
if(size == 9){
if(posicion == 7){
System.out.println("formato correcto: "+dato);
}else{
System.out.println("no tiene el formato correcto. 0000000-0");
}
}else{
System.out.println("faltan carácteres en el string");
}
} catch (IOException ex) {
Logger.getLogger(Formato.class.getName()).log(Level.SEVERE, null, ex);
}
}
}
To validate data with a certain pattern you can use the java regex
Here is an example:
String pattern = "[0-9]{7}-[0-9]{1}";
String verdadero = "6412365-4";
String falso = "923412-3";
String false2 = "1231234-99";
String falso3 = "64123653";
ArrayList<String> lista = new ArrayList<>();
lista.add(verdadero);
lista.add(falso);
lista.add(false2);
lista.add(falso3);
for (String reg : lista){
if (reg.matches(pattern){
// Haz lo que quieras aquí
}
}
I'm going through a for loop just for the example