Inventory Management

Hello, I'm working on a plugin and I've been having some trouble going about my inventory management. Currently my system is like this:

public class Inventories {

//ex
public Inventory getInventoryExample() {
return null;
}
}

public class ListenerClass implements Listener() {

@EventHandler
public void onPlayerInteract(PlayerInteractEvent e) {
Inventories inv = new Inventories();

if (p.hasCorrectItem) {

p.openInventory(inv.getINventoryExample()) ;
}

}

}


Is this efficient? (I realized if I instance it on the event it might be inefficient), what is the best solution.