Removing middle element from stack

import java.io.*;
import java.util.*;
class Stack
{
Object stk[];

int tos;
Stack(int capacity)
   {
stk=new Object[capacity];

tos=-1;

}
void push(Object ob)
{
stk[++tos]=ob;
if(tos==stk.length)
{
System.out.println("stack overflow");
System.exit(0);
}
}

Object pop()
{
return(stk[tos--]);
}
void display()
{
for(int i=tos;i>=0;i--)
{System.out.print(stk[i]+" ");}
}
 
}
class Demo
{
public static void main(String args[])throws IOException
{
Scanner sc=new Scanner(System.in);
System.out.println("enter number of elements to be pushed");
int c=sc.nextInt();
Stack s=new Stack(c);
Stack s1=new Stack(c);
BufferedReader br=new BufferedReader(new InputStreamReader(System.in));

for(int j=0;j<c;j++)
{
System.out.println("enter element");
Object ob=br.readLine();
s.push(ob);
}
int mid=c/2;

System.out.println("displaying stack");
s.display();
System.out.println("");
System.out.println("poping middle  elements from stack");
if(c%2==0)
{
while(s.tos!=mid)
{
Object t=s.pop();
s1.push(t);
}
Object t1=s.pop();
System.out.println(t1);
Object t2=s.pop();
System.out.println(t2);
}
else
{
while(s.tos!=mid)
{
Object t=s.pop();
s1.push(t);
}
Object t1=s.pop();
System.out.println(t1);



}
while(s1.tos!=-1)
s.push(s1.pop());
System.out.println("displaying stack");
s.display();

}
}

OUTPUT:(for odd number of elements)

enter number of elements to be pushed

9

enter element

1

enter element

2

enter element

3

enter element

4

enter element

5

enter element

6

enter element

7

enter element

8

enter element

9

displaying stack

9               8               7               6               5               4               3               2             1

        

poping middle  elements from stack

5

displaying stack

9               8               7               6               4               3               2               1

OUTPUT:(for even number of elements)note:in even number middle two elements are poped

enter number of elements to be pushed

4

enter element

1

enter element

2

enter element

3

enter element

4

displaying stack

4               3               2               1

poping middle  elements from stack

3

2

displaying stack

4               1