StackPushPopExample.java

import java.util.*;  
public class StackPushPopExample   
{  
public static void main(String args[])   
{  
//creating an object of Stack class  
Stack <Integer> stk = new Stack<>();  
System.out.println("stack: " + stk);  
//pushing elements into the stack  
pushelmnt(stk, 20);  
pushelmnt(stk, 13);  
pushelmnt(stk, 89);  
pushelmnt(stk, 90);  
pushelmnt(stk, 11);  
pushelmnt(stk, 45);  
pushelmnt(stk, 18);  
//popping elements from the stack  
popelmnt(stk);  
popelmnt(stk);  
//throws exception if the stack is empty  
try   
{  
popelmnt(stk);  
}   
catch (EmptyStackException e)   
{  
System.out.println("empty stack");  
}  
}  
//performing push operation  
static void pushelmnt(Stack stk, int x)   
{  
//invoking push() method      
stk.push(new Integer(x));  
System.out.println("push -> " + x);  
//prints modified stack  
System.out.println("stack: " + stk);  
}  
//performing pop operation  
static void popelmnt(Stack stk)   
{  
System.out.print("pop -> ");  
//invoking pop() method   
Integer x = (Integer) stk.pop();  
System.out.println(x);  
//prints modified stack  
System.out.println("stack: " + stk);  
}  
}