Plugin Help How can i know set a specific durabilty¿?

In this code:

Code:

  public void run()
      {
        for (Player all : getServer().getOnlinePlayers( ) ) {
          if (all.getGameMode() != GameMode.CREATIVE) {
            if (all.getInventory().getChestplate() != null)
            {
              if ((all.getInventory().getChestplate().getItemMeta().equals(Main.getJetPack().getItemMeta())) && (all.getInventory().getChestplate().getDurability() < 64))
              {
                all.setAllowFlight(true);
                if (!Main.useJetpack.contains(all)) {
                  Main.useJetpack.add(all);
                }
              }
              else
              {
                noJetPack(all);
              }
            }
            else {
              noJetPack(all);
            }
          }
        }
      }
     
      private void noJetPack(Player all)
      {
        all.setAllowFlight(false);
        if (Main.useJetpack.contains(all)) {
          Main.useJetpack.remove(all);
        }
      }
    }, 5L, 5L);
   
    Bukkit.getScheduler().scheduleSyncRepeatingTask(this, new Runnable()
    {
      public void run()
      {
        for (Player user : Main.useJetpack) {
          if ((user.isFlying()) && (user.getGameMode() != GameMode.CREATIVE)) {
            user.getInventory().getChestplate().setDurability((short)(user.getInventory().getChestplate().getDurability() + 1));
          }
        }
      }
    }, 200L, 200L);
  }
  

i need how to increase or less

EDIT by Timtower: merged posts

 

@ratg97 You should be subtracting from the current durability, not adding to it.

 

what i change?

 

What @BizarrePlatinum is saying, is change this:

Code:

        for (Player user : Main.useJetpack) {
          if ((user.isFlying()) && (user.getGameMode() != GameMode.CREATIVE)) {
            user.getInventory().getChestplate().setDurability((short)(user.getInventory().getChestplate().getDurability() + 1));
          }
        }

To this:

Code:

        for (Player user : Main.useJetpack) {
          if ((user.isFlying()) && (user.getGameMode() != GameMode.CREATIVE)) {
            user.getInventory().getChestplate().setDurability((short)(user.getInventory().getChestplate().getDurability() - 1));
          }
        }

(The change is from +1 to -1. That will decrease the durability)

 

@2008 Unless Bukkit is being ninja, that's false. A diamond pick with a durability of 0 is unbroken, a diamond pick with a durability of 1559 has 3 uses left in it.