Hi guys,
I am writing a method which given an instance of a class and a type (as a string), it will return an instance of the named type constructed from the instance if possible, null otherwise.
So say,

class A{
      A(B b) {
class B {
      B(C c) {
      // …

class C {
      // ..

so method, conversion(new C(), "A"), should return A as conversion from C->A exists. Any ideas?

Edited by Nick Evan: Fixed formatting

8 Years
Discussion Span
Last Post by javaAddict

There is no "conversion" involved. It is a simple cast, and after the return the instance will still be the same type it was before. And, it's not possible to "dynamically" change the return type of a method anyway, so the entire is doomed to failure. Maybe if you would explain what it is you are actually trying to accomplish we could help you.


Well, method returns A as an instance if coversion is possible using Java's reflection. This is the question our teacher gave us to think about. So, I am guessing we may see it on the quiz or exam.

public static Object convesrion(Object obj, String s) {


If you search the API for reflect and look at the Class class, I think that you can find methods that:
Using a String create a Class instance of the given type.
Methods that check if something can be cast.

Also as String argument be careful to add the package as well: Class.forName("pack.A");

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