How to use

setDamage

method

in

cn.nukkit.item.Item

for (Item item : contents.values()) {
  if (api.isRepairable(item)) {
    item.setDamage(0);
  for (Item item : armors) {
    if (api.isRepairable(item)) {
      item.setDamage(0);
  return false;
item.setDamage(0);
player.getInventory().setItemInHand(item);
sender.sendMessage(Language.translate("commands.repair.success"));