Evaluate the value of an arithmetic expression in Reverse Polish Notation. Valid operators are+,-,*,
EvaluatethevalueofanarithmeticexpressioninReversePolishNotation.Validoperatorsare+,-,*,/.Eachoperandmaybeanintegeroranotherexpression.在反向波动表示法中评估算术表达式的值。有效的运算符是+,-,*,/。每个操作数可能是一个整数或另一个表达式。importjava.u