solution needed

Question

Stack mystack1 = new Stack();
Stack mystack2 = new Stack();

for(int i=0; i<10; i++)mystack1.push(i);
for(int i=0; i<20; i++)mystack2.push(i);

System.out.println("stack in mystack1 ");
for(int i=0; i<10; i++)
System.out.println(mystack1.pop());

System.out.println("stack in mystack2 ");
for(int i=0; i<20; i++)
System.out.println(mystack2.pop());
https://code.sololearn.com/c77zL7L9Y6CO/?ref=app

Answer 1

There are 2 mistakes:

1) need import a library to use Stack
import java.util.*;

2) when you make a Stack you need to wonder 'stack of what?'. So you need specify you are going to fill the stack with integers
Stack<Integer> mystack1 = new Stack<Integer>();
Stack<Integer> mystack2 = new Stack<Integer>();

Answer 2

Thanks ❣️