Define a class DoublyLinkedBag that implements the ADT bag by using a doubly linked chain,...

Define a class DoublyLinkedBag that implements the ADT bag by using a doubly linked chain, as shown in Figure 1. Use the inner class of nodes that Exercise 12 defines.

FIGURE 1 A doubly linked chain for Exercises 2, 3, 4, and 5, and Project 1

Exercise 12

In a doubly linked chain, each node can reference the previous node as well as the next node. Figure 1 shows a doubly linked chain and its head reference. Define a class to represent a node in a doubly linked chain. Write the class as an inner class of a class that implements the ADT bag. You can omit set and get methods.