@Test(expected = NoSuchElementException.class) public void testPopWhenEmpty() { new MaxStack().pop(); }
public int pop() { maxStack.remove(0); return stack.remove(0); }
MaxStack { public int pop() { maxStack.remove(0); return stack.remove(0); } }
MaxStack { public int pop() { maxStack.remove(0); return stack.remove(0); }  }
MaxStack { public int pop() { maxStack.remove(0); return stack.remove(0); }  int push(int element); int pop(); int max(); int size(); }
MaxStack { public int pop() { maxStack.remove(0); return stack.remove(0); }  int push(int element); int pop(); int max(); int size();  }