Program to create , insert, delete and display operations on circular single linked list ?:

import java.io.*;

class node

{

public int x;

public node next;

}

class CircularLinkedList

{

public node first;

int count=0;

CircularLinkedList()

{

first=null;

}

void add (int v)

{

node temp=new node();

temp.x=v;

if(first==null)

first=temp;

else

{

node ptr=first;

for(int i=1;i

ptr=ptr.next;

ptr.next=temp;

}

temp.next=first;

count++;

}

void insert(int p,int v)

{

node ptr=first,temp;

int n = p==1?count+1:p;

for(int i=1;i

ptr=ptr.next;

temp=new node();

temp.x=v;

if(p==1)

{

temp.next=first;

first=temp;

}

else

temp.next=ptr.next;

ptr.next=temp;

count++;

}

void del(int p)

{

node ptr=first,temp;

int n = p==1?count+1:p;

for(int i=1;i

ptr=ptr.next;

if(p==1)

{

temp=first;

first=first.next;

}

else

temp=ptr.next;

ptr.next=ptr.next.next;

temp=null;

count--;

}

void show()

{

System.out.println("\nList Elements:");

node ptr=first;

for(int i=1;i<=count;i++)

{

System.out.print("\t"+ptr.x);

ptr=ptr.next;

}

}

}

class CListTest

{

public static void main(String as[]) throws Exception

{

String con="";

int x,op,p,v;

CircularLinkedList l1=new CircularLinkedList();

InputStreamReader isr=new InputStreamReader(System.in);

BufferedReader br=new BufferedReader(isr);

System.out.println("Enter elements to create");

do

{

x=Integer.parseInt(br.readLine());

l1.add(x);

System.out.print("Add more?(y,n):");

con=br.readLine();

}while(con.equals("y"));

l1.show();

do

{

System.out.println("\n 1.Insert\n 2.Delete \n 3.Display \n 4.Exit");

System.out.println("\nSelect an option:");

op=Integer.parseInt(br.readLine());

if(op==1)

{

System.out.println("Enter Position to insert:");

p= Integer.parseInt(br.readLine());

System.out.println("Enter Value to insert:");

v= Integer.parseInt(br.readLine());

l1.insert(p,v);

}

if(op==2)

{

System.out.println("Enter Position to delete:");

p= Integer.parseInt(br.readLine());

l1.del(p);

}

l1.show();

}while(op<4);

}

}

/* Output: */

Enter elements to create

30

Add more?(y,n):y

40

Add more?(y,n):y

50

Add more?(y,n):n

List Elements:

30 40 50

1.Insert

2.Delete

3.Display

4.Exit

Select an option:1

Enter Position to insert:2

Enter Value to insert:99

List Elements:

30 99 40 50

1.Insert

2.Delete

3.Display

4.Exit

Select an option: 4