### Question:
DoubleStackArithmeticExpression { public int calculate(String expression){ Stack<Integer> vals = new Stack<>(); Stack<Character> op = new Stack<>(); for (char var : expression.toCharArray()){ } return 0; }  int calculate(String expression);  }### Answer:
@Test void calculate() { String expression = "(2+(2*4))"; int expected = 10; int result = doubleStackArithmeticExpression.calculate(expression); Assert.assertEquals(expected,result); }