I know this question is answered some time. But all the time the parameter is an object. Thats what I want to replace:
if (s.equals("A")) { add (obj = new A(x,y)); }
if (s.equals("B")) { add (obj = new B(x,y)); }
if (s.equals("C")) { add (obj = new C(x,y)); }
I have this:
try
{
Class cl = Class.forName(s);
Constructor con = cl.getConstructor (x, y);
obj = con.newInstance(x, y);
}
but it expect x,y as a class, but its an int. How to do this>
You need
cl.getConstructor(int.class, int.class);
There are Class objects reflecting on primitive types, and even the void type has it reflective counterpart in Void.class.
You need to use:
cl.getConstructor(int.class,int.class);
to get the constructor with (int,int) arguments.
If x and y are int, try to call getConstructor by passing the type of the exptected parameters:
Class cl = Class.forName(s);
Constructor con = cl.getConstructor (Integer.TYPE, Integer.TYPE);
obj = con.newInstance(x, y);
What you need is to provide the types to the getConstructor method. That is
Constructor con = cl.getConstructor (x.getClass(), y.getClass());
or
Constructor con = cl.getConstructor (ClassOfX.class, ClassOfY.class);
ints then maybe trycl.getConstructor (int.class, int.class);Constructor con = c1.getConstructor((Integer) x, (Integer) y);