Single Linked List Implementation in Java

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Questions and Answers

What is the purpose of the insertAtPos method in a single linked list?

The insertAtPos method allows insertion of a new node at a specified position in the linked list.

How does the deleteAtFront method affect the linked list?

The deleteAtFront method removes the first node from the linked list, updating the head to the next node.

Describe the process performed by the deleteAtEnd method.

The deleteAtEnd method traverses the list to find the last node and removes it, updating the previous node's next reference to null.

What will happen if the deleteAfterData method is called with data not present in the list?

<p>If the specified data is not found, the method outputs that the node is not present in the list.</p> Signup and view all the answers

In the search method, what does the return value indicate?

<p>The return value indicates whether the specified key exists in the linked list; it returns true if found, otherwise false.</p> Signup and view all the answers

How does the method deleteAfterData handle deletion when the specified node is the last node?

<p>If the specified data is the last node, the method indicates that deletion is not possible for the last node.</p> Signup and view all the answers

What is the significance of the prev variable in the insertAtPos method?

<p>The <code>prev</code> variable keeps track of the node preceding the position where the new node is to be inserted.</p> Signup and view all the answers

Explain how the head variable is utilized in linked list operations.

<p>The <code>head</code> variable points to the first node of the linked list, serving as the entry point for various operations.</p> Signup and view all the answers

What is the purpose of the display method in the SingleLinkedList class?

<p>The <code>display</code> method prints out all the elements in the linked list from the head to the end, indicating the linkage between nodes.</p> Signup and view all the answers

Explain the function of the search method within the context of a singly linked list.

<p>The <code>search</code> method iterates through the linked list to find a node containing a specified key, returning true if found and false otherwise.</p> Signup and view all the answers

How does the user interact with the SingleLinkedList class through the main method?

<p>The user interacts with the class through a console menu that allows them to perform various operations like insertion, deletion, and searching by inputting relevant options.</p> Signup and view all the answers

What happens when the user selects the Deletion at the beginning option?

<p>Selecting <code>Deletion at the beginning</code> removes the first node of the linked list and updates the head to the next node.</p> Signup and view all the answers

Identify how the program prevents the user from performing invalid operations.

<p>The program uses a menu-driven approach with predefined cases to ensure that only valid operations, like insertion and deletion, are executed.</p> Signup and view all the answers

What is the role of the try-with-resources statement in the main method?

<p>The <code>try-with-resources</code> statement automatically closes the <code>Scanner</code> resource once the user exits, preventing resource leaks.</p> Signup and view all the answers

Describe what occurs when the insertAtPos method is called.

<p>The <code>insertAtPos</code> method adds a new node with the specified data after a given position in the list, modifying the pointers of the involved nodes.</p> Signup and view all the answers

What condition triggers the exit of the program within the main method?

<p>The program exits when the user selects option 7, which corresponds to 'Exit' in the menu.</p> Signup and view all the answers

Flashcards

What is a Singly Linked List?

A linked list is a linear data structure where each element (called a node) points to the next element in the sequence. Each node contains data and a reference (pointer) to the next node.

What is the 'head' of a linked list?

The head is a special node that points to the first element in the linked list. It acts as the entry point for navigating the list.

What is a node in a linked list?

A node within a linked list. It contains data and a pointer to the next node in the sequence.

How does the 'insertAtPos' method work?

To insert a new node at a specific position in a linked list.

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How does the 'deleteAtFront' method work?

To remove the first node from a linked list.

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How does the 'deleteAtEnd' method work?

To remove the last node from a linked list.

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How does the 'deleteAfterData' method work?

To remove a node that comes after a node with a specified value.

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How does the 'search' method work?

To check if a specific value is present in a linked list.

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Singly Linked List

A linked list is a linear data structure where each element (node) points to the next element in the sequence. This allows for efficient insertion and deletion at any point in the list.

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Node (SingleLinkedList)

A Node in a linked list represents a single element. It contains the data value and a pointer to the next node in the sequence. In the context of the code provided, Node is an inner class within the SingleLinkedList class.

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head (SingleLinkedList)

The head of a linked list is a pointer to the first node in the sequence. It acts as the entry point to accessing the entire list.

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next (SingleLinkedList)

The next pointer in a Node points to the subsequent node in the linked list. It establishes the sequence and allows traversal. In the context of the code provided, next points to the following node in the list or 'null' if it's the last node.

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data (SingleLinkedList)

A data field in a Node stores the actual value associated with that specific node. It represents the content of the element.

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insertAtPos (SingleLinkedList)

The insertAtPos function allows inserting a new node at a specific position within the linked list. It takes the data value to be inserted as input. It finds the right position and modifies pointers to connect the new node within the list.

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deleteAtFront (SingleLinkedList)

The deleteAtFront function removes the first node from the linked list. It updates the head pointer to reference the second node, effectively removing the initial node.

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deleteAtEnd (SingleLinkedList)

The deleteAtEnd function removes the last node from the linked list. It traverses the list until it finds the penultimate node, updates its next pointer to null, effectively disconnecting the last node.

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Study Notes

Single Linked List Implementation in Java

  • Node Class:

    • int data: Stores integer data in the node.
    • Node next: Pointer to the next node in the list.
    • Node(int data): Constructor to initialize a new node. Sets next to null.

  • SingleLinkedList Class:

    • private Node head: Reference to the first node in the list.
    • insertAtPos(int data): Inserts a new node with data at a specified position.
      • Takes input from the user for the insertion position.
      • Creates a new Node object.
      • Iterates to the position before insertion.
      • Updates next pointers to link the new node. Handles cases where the position is at the beginning or the end.
    • deleteAtFront(): Deletes the node at the beginning of the list.
      • Checks if the list is empty.
      • If not empty, updates the head pointer to skip the deleted node.
      • Prints a message indicating the data deleted.
    • deleteAtEnd(): Deletes the node at the end of the list.
      • Handles empty list scenarios.
      • For a non-empty list, iterates to the second-to-last node.
      • Updates the next pointer of the second-to-last node to null, effectively removing the last node.
      • Prints a message if a deletion occurred.
    • deleteAfterData(int data): Deletes the node immediately following a node with the given data.
      • Handles empty list cases.
      • Iterates to find the node containing the specific data.
      • Handles cases where the target node isn't found.
      • Handles cases where the next node is the last node.
        • Prints a message if no deletion occurred.
    • search(int key): Searches for a node with the given key.
      • Iterates through the list until the key is found or the end of the list is reached
      • Returns true if the key is found, false otherwise.
    • display(): Prints all data elements in the list to the console.
      • Iterates through the list using a current node reference.
      • Prints each node by printing the data element and a space.

  • Main Function (main):

    • Creates a SingleLinkedList object.
    • Prompts the user for input to perform various operations: insertion, deletion at the beginning, deletion at the end, deletion after a specific node, display, search or exit.
    • Uses a switch statement to perform the selected action based on user input.
    • Calls the appropriate methods from the SingleLinkedList class to execute the requested operations.

Error Handling and Exception Handling

  • The code includes try-catch blocks to handle potential InputMismatchException when the user enters non-integer input.
  • It also includes checks for empty lists to prevent errors in deletion operations.

Data Structures

  • Linked List: A linear data structure that stores elements in nodes. Each node contains data and a pointer to the next node.

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