4. What are the contents of the stack pile after the following statements execute Assume that MyStack is a class that implements the interface StackInterface. StackInterface pile = new MyStack( ); pile.push("Jane"); pile.push("Jess"); pile.push("Jill"): pile.push(pile.pop( )): pile.push(pile.peek( )); pile.push("Jim"): String name = pile.pop( ): pile.push(pile.peek():
4. What are the contents of the stack pile after the following statements execute Assume that MyStack is a class that implements the interface StackInterface. StackInterface pile = new MyStack( ); pile.push("Jane"); pile.push("Jess"); pile.push("Jill"): pile.push(pile.pop( )): pile.push(pile.peek( )); pile.push("Jim"): String name = pile.pop( ): pile.push(pile.peek():
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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Transcribed Image Text:### Understanding Stack Operations in Java
In this section, we explore a Java code snippet involving stack operations. The goal is to determine the contents of the stack after executing a series of commands. Assume that `MyStack` is a class that implements the `StackInterface`.
#### Code Snippet:
```java
StackInterface<String> pile = new MyStack<String>();
pile.push("Jane");
pile.push("Jess");
pile.push("Jill");
pile.push(pile.pop());
pile.push(pile.peek());
pile.push("Jim");
String name = pile.pop();
pile.push(pile.peek());
```
#### Explanation of Operations:
1. **Initialization:**
- A new stack `pile` is created for `String` types.
2. **Push Operations:**
- `"Jane"` is pushed onto the stack.
- `"Jess"` is pushed on top of `"Jane"`.
- `"Jill"` is pushed on top of `"Jess"`.
3. **Intermediate Operations:**
- `pile.pop()` is executed, removing `"Jill"` and returning it; then immediately pushing it back onto the stack.
- `pile.peek()` retrieves the current top, `"Jill"`, without removing it, and then pushes `"Jill"` again.
4. **Additional Operations:**
- `"Jim"` is pushed, making it the new top of the stack.
5. **Pop Operation:**
- The `pop` method is called, removing `"Jim"` from the stack, and `name` is set to `"Jim"`.
6. **Final Peek and Push:**
- `pile.peek()` retrieves `"Jill"`, and it is pushed onto the stack again.
#### Final Stack Contents:
Starting from the top of the stack moving to the bottom, the contents will be:
- `"Jill"`
- `"Jill"`
- `"Jess"`
- `"Jane"`
This sequence reflects the Last-In-First-Out (LIFO) order of stack operations.
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