Solved Splitting isn't working.....

So, I am making a plugin which displays some numbers, but those have to be rounded a bit.
My problem is an ArrayIndexOutOfBoundsException, because this line:

Code:java

String[] retunsArray = returns.split(".");

of code in this thing (on line 28 and 51):

full class (open) full class (close)

Code:java

package me.datdenkikniet;
 
import org.bukkit.ChatColor;
import org.bukkit.entity.Player;
import org.bukkit.scheduler.BukkitRunnable;
 
public class Runnable extends BukkitRunnable{
    Main plugin;
    public Runnable(Main instance){
        plugin=instance;
    }
    @Override
    public void run() {
        for (Player p: plugin.getServer().getOnlinePlayers()){
        HeadsUpDisplay.displayTextBar(ChatColor.GOLD + "Damage: " +ChatColor.GRAY + getExtraDamage(p) + "%" + ChatColor.GOLD + " Resistance: " +ChatColor.GRAY + getResistance(p) + "%", p);
        }
    }
    private String getExtraDamage(Player p){
        String returns = null;
        Double damage = plugin.getConfig().getDouble("extra damage");
        if (p.getLevel() > 0){
            returns = String.valueOf(damage*p.getLevel() + 100);
        }
        p.sendMessage(returns);
        if (returns == null){
            returns = "0.0";
            }
        String[] retunsArray = returns.split(".");
        if (!(retunsArray[1].length() < 2)){
            returns = returns.substring(0,2);
        }
        p.sendMessage(retunsArray[0] + retunsArray[1]);
        return returns;
    }
    private String getResistance(Player p) {
        String returns = null;
        Double resist = plugin.getConfig().getDouble("extra resistance");
        Double maxResist = plugin.getConfig().getDouble("max resistance");
        if (p.getLevel() > 0){
            if (!(resist * p.getLevel() > maxResist)){
                returns = String.valueOf(100 - ((1-(resist/100 * p.getLevel()))*100));
            } else {
                returns = String.valueOf(100 - ((1 - maxResist/100)*100));
            }
        }
        if (returns == null){
            returns = "0.0";
        }
        String[] returnsArray = returns.split(".");
        if (!(returnsArray[1].length() < 2)){
            returns = returns.substring(0, 2);
        }
        return returns;
    }
}
 

isn't doing what its supposed to be (split the string )

 

Short answer
Do this instead:

Code:

String[] retunsArray = returns.split("\\.");

Long answer
The string split function doesn't necessarily take one character, it actually takes a regular expression. "Regex" is a sort of markup language for strings, you can google it if you don't know what it is. The problem you have is that a period in regex means "any character", so what you're doing now is splitting the string on every character in it and resulting in a ton of blank strings. To get around this you need to escape it by putting \\ before the period, so: "\\."

 

adam753 okay, thank you very much, I always thought a "Regex" was kind of a string thing (and it actually is, but differently from what I thought)