import java.util.Scanner;
public class SingleLL
{
Node start=new Node();
Node end=new Node();
Node curr=new Node();
int num;
SingleLL()
{
start=null;
end=null;
num=0;
}
void AddBeg(int val)
{
Node t=new Node();
t.info=val;
if(num++==0)
end=t;
else
t.next=start;
start=t;
}
void AddEnd(int val)
{
Node t=new Node();
t.info=val;
t.next=null;
if(num++==0)
start=t;
else
end.next=t;
end=t;
}
void DelBeg()
{
if(num==0)
System.out.println("Linked List is Empty");
else
{
if(start==end)
{
start=null;
end=null;
num=0;
}
else
start=start.next;
}
}
void DelEnd()
{
if(num==0)
System.out.println("Linked List is Empty");
else
{
if(start==end)
{
start=null;
end=null;
num=0;
}
else
{
curr=start;
while(curr.next!=end)
curr=curr.next;
end=curr;
end.next=null;
}
}
}
void DelEle(int val)
{
if(num==0)
System.out.println("Linked List is Empty");
else
{
curr=start;
Node prev=new Node();
if(end==start && start.info==val)
{
start=end=null;
num=0;
}
else if(start.info==val)
start=start.next;
else if(end.info==val)
{
System.out.println("HEllo");
curr=start;
while(curr.next!=end)
curr=curr.next;
end=curr;
end.next=null;
}
else
{
curr=start;
while(curr.info!=val)
{
prev=curr;
curr=curr.next;
}
prev.next=curr.next;
}
}
}
void Display()
{
curr=start;
System.out.print("Start -> ");
while(curr!=null)
{
System.out.print(curr.info + " -> ");
curr=curr.next;
}
System.out.println("End");
}
void Search(int val)
{
Loop:
{
for(curr=start;curr!=null;curr=curr.next)
{
if(curr.info==val)
{
System.out.println("Element Found");
break Loop;
}
}
System.out.println("Element Not Found");
}
}
public static void main(String args[])
{
int ch,val;
SingleLL sl=new SingleLL();
Scanner in = new Scanner(System.in);
while(true)
{
System.out.println("-----------------------------------");
System.out.println("Enter your Choice");
System.out.println("1 : Add Beg 2 : Add End 3 : Del Beg 4 : Del End 5 : Del Ele 6 : Display 7 : Search 8 : Exit");
ch=in.nextInt();
switch(ch)
{
case 1:
{
System.out.print("Enter Number = ");
val=in.nextInt();
sl.AddBeg(val);
break;
}
case 2:
{
System.out.print("Enter Number = ");
val=in.nextInt();
sl.AddEnd(val);
break;
}
case 3:
{
sl.DelBeg();
break;
}
case 4:
{
sl.DelEnd();
break;
}
case 5:
{
System.out.print("Enter Number To Delete = ");
val=in.nextInt();
sl.DelEle(val);
break;
}
case 6:
{
sl.Display();
break;
}
case 7:
System.out.print("Enter Number = ");
val=in.nextInt();
sl.Search(val);
break;
case 8:
System.exit(0);
break;
default : continue;
}
}
}
}
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