Plugin not working. getTypedID() Change?

HTML:

@EventHandler
    public void onInvClick(InventoryCloseEvent event) {
        Player player = (Player) event.getPlayer();
        PlayerInventory pi = player.getInventory();
        if (pi.getHelmet() != null && pi.getChestplate() != null && pi.getLeggings() != null && pi.getBoots() != null) {
            int h = pi.getHelmet().getTypeId();
            int c = pi.getChestplate().getTypeId();
            int l = pi.getLeggings().getTypeId();
            int b = pi.getBoots().getTypeId();
       
            if (h == 306 && c == 307 && l == 308 && b == 309) {
                if (pclass.get(player.getName()) == "Warrior")  {
                    return;
                } else {
                    pclass.put(player.getName(), "Warrior");

I want the player to become a Warrior when they equip full Iron. My plugin has worked before and I just came back to it. However now nothing happens when full iron is equipped. The getTypeID() is getting suppressWarning's

Appreciate the help

 

Use GetType and check on the material enum.

For example

Code:java

Material h = pi.getHelmet().getType();
if (h == Material.IRON_HELMET){
  //do code
}