Monday 14 April 2014

Implementation of Linked-List using java.util.LinkedList class



/*
     illustration of java.util.LinkedList class
     the LinkedList Class implements the List interface
*/
import java.io.*;
import java.util.*;

class Main
{
     public static void main(String args[])
     {
    
           try
           {
                BufferedReader br=new BufferedReader (new InputStreamReader(System.in));
                LinkedList ll=new LinkedList();
                while(true)
                {
                     System.out.println("__________________choices_____________________________");
                     System.out.println("\nYour option are : ");
                    
                     System.out.println("1. Insert a new element in the linked list at last");
                     System.out.println("2. Insert a new element in the linked list at first");
                     System.out.println("3. Get the first element of the linked list");
                     System.out.println("4. Get the last element of the linked list");
                     System.out.println("5. Remove the first element from the linked list");
                     System.out.println("6. Remove the last element from the linked list");
                     System.out.println("7. Print the size of the linked list");
                     System.out.println("8. Exit");
                    
                    
                     System.out.println("");
                     System.out.print("Enter your choice : ");
                     int choice=Integer.parseInt(br.readLine());
                    
                     switch(choice)
                     {
                           case 1:
                                System.out.print("Enter the Number that you want to Insert at the end : ");
                                int num=Integer.parseInt(br.readLine());
                    
                                ll.addLast(new Integer(num));
                                break;
                           case 2:
                                System.out.print("Enter the Number that you want to Insert at the start : ");
                                num=Integer.parseInt(br.readLine());
                    
                                ll.addFirst(new Integer(num));
                                break;
                           case 3:
                                System.out.println(ll.getFirst());
                                break;
                           case 4:
                                System.out.println(ll.getLast());
                                break;
                           case 5:
                                try
                                {
                                     ll.removeFirst();
                                }
                                catch(NoSuchElementException e)
                                {
                                     System.err.println("Your Linked list is empty !!!\nDeletion not possible");
                                }
                                break;
                           case 6:
                                try
                                {
                                     ll.removeLast();
                                }
                                catch(NoSuchElementException e)
                                {
                                     System.err.println("Your Linked list is empty !!!\nDeletion not possiblez");
                                }
                                break;
                           case 7:
                                System.out.println("The size of the linked list is : "+ll.size());
                                break;
                           case 8:
                                System.exit(0);
                           default:
                                System.out.println("You entered a wrong choice !! \nEnter a correct choice again...");
                                break;
                     }
                    
                     System.out.println("\nYour Linked list is : \n"+ll);
                }
           }
           catch(IOException e){}
     }
}

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