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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)
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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### 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.
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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