提示java.lang.String.replace问题？

您需要将新值分配回变量。

double myDouble = myObject.getDoubleMethod(); // returns 38.1882352941176System.out.println(myDouble);String myDoubleString = "" + myDouble;System.out.println(myDoubleString);myDoubleString = myDoubleString.replace(".", ",");System.out.println(myDoubleString);myDoubleString = myDoubleString.replace('.', ',');System.out.println(myDoubleString);