将字符串转换为对象名称Java

it might be a simple question or even impossible without any kind of Interface (Arrays, Maps etc.) but I would like to know if there's any possibility of converting an object name to String so I can pass as argument. I have two classes Paciente and Sintomas with multiple objects that I need to pass as argument to a function but I don't want to use arrays (it must be like that) and I can't figure any other way of doing so without manually make an insert for each one. it might be a simple question or even impossibl