import java.util.Stack;
import java.util.Random;

public class StackSharing {
	public static void main(String [] args){
		// create a new stack of strings
		Stack<String> stack = new Stack<String>();
		
		// push some strings onto the stack
		stack.push("apple");
		stack.push("banana");
		stack.push("kiwi");
		
		// Java allows you to print the entire stack
		System.out.println(stack);
		
		System.out.println(stack.empty());

		Stack<String> stackToo = new Stack<String>();

		stackToo.push("tomato");

		stack.pop();

		stackToo = stack;

		stack.pop();


		System.out.println("Before m:");
		System.out.println(stack);
		System.out.println(stackToo);

		Stack<String> newStack = m(stack);

		System.out.println(stack);
		System.out.println(stackToo);
		System.out.println(newStack);

		newStack.pop();

		System.out.println(stack);
		System.out.println(stackToo);
		System.out.println(newStack);

		
		Stack<String> newStack1 = mm(stack);
		newStack1.pop();

		System.out.println(stack);
		System.out.println(newStack1);


	}

	public static Stack<String> m(Stack<String> s) {
		s.push("pear");		
		return s;
	
	}

	public static Stack<String> mm(Stack<String> s) {
		Stack<String> newStack = new Stack<String>();
		String str = s.pop();
		s.push(str);
		newStack.push(str);		
		return newStack;
	
	}	
	

}