Question

I want to create a Java class with two generic types.

public class BinaryContractInfo<T, U>

The thing is that I would like U to be either the same type of T or T[].

Basically I would like to know if T extends T[] or vice versa. Then I could do something like

public class BinaryContractInfo<T, U extends T[]>

Is that possible? Is there a way to do that?

Answer 1

You cannot specify a type as being either T or T[] Instead you can use varargs

public void method(T... ts);

which can be called either

method(t);
method(t1, t2, t3);
T[] ts = 
method(ts);

For return types you can specify

public T[] method();

if the caller assumes there is only one return value

T t = method()[0];