(Solved): Refer to the UML below to implement the data structure of a stack Step 1: Create a java interface, ...

Refer to the UML below to implement the data structure of a stack Step 1: Create a java interface, StackInterface, to define Stack ADT. (if there is already the interface, you do not have to create and use the existing one) Step 2: Create a java class, LLNode, to represent a node structure. Step 3: Create a java class, LinkedStack, to implement the interface above Step 4: Create a java class, TestLinkedStack, to test if your implementation works or not (1) The code of StackInterface: (2) The code of LLNode: (3) The code of LinkedStack: needing to see the codes for each three classes and the final output in TestLinkedStack main method. please help