How do you add an int to a sign?

I am trying to make so when a player clicks a sign, a number on it will change. I am trying to set a number on the sign, but I am only able to set a string. So if I make a string like this "1" I get the number on the sign, but I need to be able to update this. Like getting the line it is on get the int add one to it and then update the sign. I have not been able to do this though, because the sign only works with strings. Is there something I am missing about signs?

 

Gamesareme

Code:java

int number = Integer.parseInt(lineFromSign);

It will throw a NumberFormatException if your String is not a number. The best way to avoid this is by checking if it is actually a number:

Code:java

public boolean isInteger(String string){
    try{
        Integer.parseInt(string);
    }catch(Exception ex){
        return false;
    }
 
    return true;
}

 

Gamesareme
Integer#parseInt(String s)

Be sure to properly handle it if in a situation that a String received is not "garuanteed".