import java.util.*;
class StackDemo
{
static void StackPush(Stack St,int a)
{
St.push(new Integer(a));
System.out.println("push +a");
System.out.println("stack:"+St);
}
static void Showpop(Stack St)
{
System.out.println("pop:-");
Integer a=(Integer)St.pop();
System.out.println(a);
}
public static void main(String args[])
{
Stack St=new Stack();
System.out.println("Stack"+St);
StackPush(St,42);
StackPush(St,52);
StackPush(St,62);
StackPush(St,72);
Showpop(St);
Showpop(St);
Showpop(St);
Showpop(St);
try
{
Showpop(St);
}
catch(EmptyStackException e)
{
System.out.println("stack underflow"+e);
}
}
}
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