The document discusses different implementations of stacks and queues using linked lists and arrays. It describes how stacks can be implemented using a linked list, with push and pop operations adding and removing nodes from the head of the list. Queues can also be implemented with linked lists or arrays, but arrays require additional logic to maintain first-in, first-out order efficiently. Common applications of stacks and queues include evaluating expressions, checking for balanced brackets, and managing tasks in operating systems and server requests.

2. List Stack Example Java Code Stack st = new Stack(); st.push(6); top 6

3. List Stack Example Java Code Stack st = new Stack(); st.push(6); st.push(1); top 6 1

4. List Stack Example Java Code Stack st = new Stack(); st.push(6); st.push(1); st.push(7); top 6 1 7

5. List Stack Example Java Code Stack st = new Stack(); st.push(6); st.push(1); st.push(7); st.push(8); top 6 1 7 8

6. List Stack Example Java Code Stack st = new Stack(); st.push(6); st.push(1); st.push(7); st.push(8); st.pop(); top 6 1 7 8

7. List Stack Example Java Code Stack st = new Stack(); st.push(6); st.push(1); st.push(7); st.push(8); st.pop(); top 6 1 7

14. Checking for Balanced Braces Figure 7-3 Traces of the algorithm that checks for balanced braces

16. Evaluating Postfix Expressions Figure 7-8 The action of a postfix calculator when evaluating the expression 2 * (3 + 4)

19. Using a Queue

23. An Array-Based Implementation Figure 8-8 a) A naive array-based implementation of a queue; b) rightward drift can cause the queue to appear full