STACK OPERATION

stack operation code in java

### stack implementation using java language

/* package whatever; // don't place package name! */

import java.util.*;
import java.lang.*;
import java.io.*;

/* Name of the class has to be "Main" only if the class is public. */
class Stack
{
	LinkedList stack;
	public Stack(){
		stack=new LinkedList();
	}
	
	public boolean isEmpty(){
		return stack.isEmpty();
	}
	
		public int size(){
		return (int) stack.size();
	}
	
	public int push(int k){
		   stack.add(k);
		   return k;
		// else
		//  System.out.println("Stack overFlow");
	}
	
	public int  pop(){
		if((int)stack.size()==0)
		  return 0;
		 else
	      return (int)stack.remove(stack.size()-1);
	   }
	
	public int top(){
		return (int)stack.get(stack.size()-1);
	} 

	  
	public static void main (String[] args) throws java.lang.Exception
	{
		Stack numberStack = new Stack();
        System.out.println("Size of Stack:"+numberStack.size());
	System.out.println("Stack is empty or not: "+isEmpty());
        System.out.println("pushed element is :"+numberStack.push(5));
        //numberStack.push(5);
	System.out.println("Stack is empty or not: "+isEmpty());
        System.out.println("Size of Stack:"+numberStack.size());
        System.out.println("top of Stack:"+numberStack.top());
        //numberStack.push(8);
	System.out.println("Stack is empty or not: "+isEmpty());
        System.out.println("pushed element is :"+numberStack.push(8));
        System.out.println("top of Stack:"+numberStack.top());
        System.out.println("Size of Stack:"+numberStack.size());
        System.out.println("pop operation performed: "+numberStack.pop());
        System.out.println("pop operation performed: "+numberStack.pop());
        System.out.println("pop operation performed: "+numberStack.pop());
	System.out.println("Stack is empty or not: "+isEmpty());
	}
}