Java ArrayList<custom class> Main method cannot find symbol

Code Help
1

Question: Hi, I created 3 classes. Main, Inventory, and InventoryManager. When I try to compile and run Main.java I get errors stating that ArrayList and InventoryManager symbols cannot be found.

What am I doing wrong?

java Main.java
Main.java:7: error: cannot find symbol
    ArrayList<Inventory> inventorySystem = new ArrayList<Inventory>();
              ^
  symbol:   class Inventory
  location: class Main
Main.java:7: error: cannot find symbol
    ArrayList<Inventory> inventorySystem = new ArrayList<Inventory>();
                                                         ^
  symbol:   class Inventory
  location: class Main
Main.java:10: error: cannot find symbol
    InventoryManager inventoryManager = new InventoryManager();
    ^
  symbol:   class InventoryManager
  location: class Main
Main.java:10: error: cannot find symbol
    InventoryManager inventoryManager = new InventoryManager();
                                            ^
  symbol:   class InventoryManager
  location: class Main
Main.java:18: error: cannot find symbol
      boolean loopValue = inventoryManager.determineFunction(inputString, inventorySystem);
                                                             ^
  symbol:   variable inputString
  location: class Main
Main.java:19: error: cannot find symbol
    } while (loopValue == true);
             ^
  symbol:   variable loopValue
  location: class Main
6 errors
error: compilation failed

**Repl link: https://replit.com/@kaltice34/IntrotoJavaProject#InventoryManager/Main.java

code snippet
2

Hello, @kaltice34! You have not imported the classes.
Sorry, but I do not know how to import them. You have to find out yourself.