Generics question

[Harikrishna Gorrepati]

Hi, This is general question. what if I do 300 will be printed at Line # 5 ?

 public class P626_Generics_classType0_Ask {
    public static void main(String[] args) {
	Processor<Integer> processorRef = new Processor<Integer>();
	Integer total = processorRef.addAll(100, 200);
	System.out.println(total); //prints null
    }
}

class Processor<T> {
    public T addAll(T i1, T i2) {
	int i100 = (Integer) i1;
	int i200 = (Integer) i2;
	System.out.println(i100 + i200);
	return null;
    }
}   

[Trivikram Kamat]

I don't understand the use of Generic type T in class Processor, if you're confident of typecasting parameters of type T (of method addAll) to Integer type.

[Harikrishna Gorrepati]

Trivikram Kamat wrote:I don't understand the use of Generic type T in class Processor, if you're confident of typecasting parameters of type T (of method addAll) to Integer type.

I can print 300 in Processor class. But I want 300 to be returned to the caller at Line #4 and print at Line # 5

[Trivikram Kamat]

The meaning of my question was, if you're sure that you can typecast T to Integer in method addAll(), then I don't think there's need of forceful use of Generics in this case.

A generic type is a reference type that defines a list of formal type parameters or type variables that must be provided before it can be used as a type.
So, you don't know what type T will be while defining class Processor.
I guess it would be inappropriate to use typecasting T to Integer.