Lab 20 Removing the first element in a list Start this lab with the code listed below. The LinkedList class defines the rudiments of the code needed to build a linked list of Nodes. Complete the code for the removeFirst method, which should remove and return the first element in the linked list. Throw a NoSuchElementException if the method is invoked on an empty list. Use the LinkedListRunner class's main method to test your code. import java.util.NoSuchElementException; public class LinkedList private Node first; public LinkedList () { first = null; } public Object getFirst () if (first == null) { throw new NoSuchElementException (); }

Lab 20 Removing the first element in a list Start this lab with the code listed below. The LinkedList class defines the rudiments of the code needed to build a linked list of Nodes. Complete the code for the removeFirst method, which should remove and return the first element in the linked list. Throw a NoSuchElementException if the method is invoked on an empty list. Use the LinkedListRunner class's main method to test your code. import java.util.NoSuchElementException; public class LinkedList private Node first; public LinkedList () { first = null; } public Object getFirst () if (first == null) { throw new NoSuchElementException (); }

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Concept explainers

Operations of Linked List

A linked lists are one of the most widely used and effective data structures, with applications in every programming language, including C, C++, Python, Java, and C#.

Question

public Object data;
public Node next;
public class LinkedListRunner
public static void main (String[] args)
LinkedList myList = new LinkedList ();
myList.addFirst ("aaa"):
myList.addFirst ("bbb");
myList.addFirst ("ccc");
myList.addFirst ("ddd");
System.out.println (myList);
System.out.println ("Removed element:
System.out.println ("Removed element:
System.out.println (myList);
+ myList.removeFirst () );
" + myList.removeFirst () ) ;

Lab 20 Removing the first element in a list
Start this lab with the code listed below. The LinkedList class defines the rudiments of the code
needed to build a linked list of Nodes. Complete the code for the removeFirst method, which should
remove and return the first element in the linked list. Throw a NoSuchElementException if the
method is invoked on an empty list. Use the LinkedListRunner class's main method to test your
code.
import java.util.NoSuchElementException;
public class LinkedList
private Node first;
public LinkedList () { first = null; }
public Object getFirst ()
if (first == null) { throw new NoSuchElementException (); }
return first.data;
}
public void addFirst (Object element)
Node aNode - new Node () ;
aNode.data - element;
aNode.next = first;
first = aNode;
public Object removeFirst ()
// put your code here
}
public String tostring ().
String temp = "";
Node current = first;
while (current != nul1)
temp = temp + current.data.toString () + '\n';
current = current.next;
return temp;
class Node
{

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