cara menambahkan coding pop lewat keyboard?

/\\ \* @(#)coba.java \* \* coba application \* \* @author \* @version 1.00 2017/5/10 */ import java.io.*; import java.util.Stack; public class ragiltumpukan {

public static void main(String[] args) throws IOException { BufferedReader in= new BufferedReader(new InputStreamReader(System.in)); Stack s = new Stack(); Stack t = new Stack(); Stack z = new Stack(); int data,x,y=0; double i; String w; String []keluar=new String[10]; do { System.out.print("Masukan Array : ");data=Integer.parseInt(in.readLine()); double dat[] = new double [data]; for(i=0;i