please use java

- Write a method size() that returns the number of elements in the linkedlist Cuplist. - Write a method getNodeAt() that returns the reference to cup node object at a specific position given as a parameter of the method. - Write a method, insertPos(), to insert a new CupNode object at a specific position given as a parameter of the method. - Write a method, deletePos(), to remove the CupNode object at a specific position given as a parameter of the method