如何将具有float作为返回类型和数据类型的java文件转换为double的java文件

I have float calculations (Means my method returning float values or variables in my method are float type) in java, but when I am giving input of double type... all the calculations(Means return types & variables within the method) must be convert as double, how it is possible?.. but I have to use same class for both float and double inputsI have float calculations (Means my method retu