Someone

package classsign;import org.bukkit.Bukkit;import org.bukkit.event.player.PlayerListener;import org.bukkit.event.block.Action;import org.bukkit.event.player.PlayerInteractEvent;import org.bukkit.entity.Player;import org.bukkit.block.Sign;import org.bukkit.ChatColor;import org.bukkit.inventory.ItemStack;public class CSPlayerListener extends PlayerListener {    private final ClassSign plugin;        CSProps props;        Player player;    Boolean classExists = false;        public CSPlayerListener(ClassSign instance, CSProps props) {        plugin = instance;        this.props = props;    }        @Override    public void onPlayerInteract(PlayerInteractEvent event) {        player = event.getPlayer();        if (event.getAction() == Action.RIGHT_CLICK_BLOCK) {            if (event.getClickedBlock().getState() instanceof Sign) {                Sign sign = (Sign)event.getClickedBlock().getState();                if (sign.getLine(0).equals("[Class]")) {                    for (int i = 0; i < props.numOfClasses; i++) {                        if (sign.getLine(1).equals(props.classes.get(i))) {                            classExists = true;                        }                    }                                        if (classExists == true) {                        if (props.emptyInventory == true) {                            player.getInventory().clear();                        }                        String items = props.file.getString("classes." + sign.getLine(1) + ".items", null);                        String[] itemarr = items.split("[,]");                        for (int i = 0; i < itemarr.length; i++) {                            if (itemarr[i].contains(":")) {                                String[] item = itemarr[i].split("[:]");                                System.out.println(item[0]);                                if (item[1].matches("[0-9]*") && item[0].matches("[1-9]*")) {                                    if (Integer.parseInt(item[1]) != 0) {                                        if (Integer.parseInt(item[1]) > 1) {                                            for (int x = 1; x < Integer.parseInt(item[1]); x++) {                                                player.getInventory().addItem(new ItemStack(Integer.parseInt(item[0]), 1));                                            }                                        } else {                                            player.getInventory().addItem(new ItemStack(Integer.parseInt(item[0]), 1));                                        }                                    }                                }                            } else {                                if (itemarr[i].matches("[1-9]*")) {                                    if (Integer.parseInt(itemarr[i]) != 0) {                                        player.getInventory().addItem(new ItemStack(Integer.parseInt(itemarr[i]), 1));                                    }                                }                            }                        }                    } else {                        sign.setLine(3, ChatColor.RED + "[INACTIVE]");                        player.sendMessage(ChatColor.BLUE + "[ClassSign] Oh dear, that class doesn't exist anymore.");                    }                }            }        }    }}