How to pass Byte and Integer to Generics?

[Slaxmi Raj]

class Gen1<T>
{
	T ob;
	Gen1(T d)
	{
		ob=d;
	}
	T getOb()
	{
		return ob;
	}
}
public class GenDemo1
 {
	public static void main(String[] args)
       {
                  Gen1<Integer> iob=new Gen1<Integer>(99);
                  System.out.println(iob.getOb())
                  Gen1<Byte>bob=new Gen1<Byte>(25);
                  System.out.println(bob.getOb());

      }
}

Hello , here i created simple generic ,i passed one integer and one byte, it will not take byte's value.When compile, it says

Exception in thread "main" java.lang.Error: Unresolved compilation problem:
The constructor Gen1<Byte>(int) is undefined

please any one tell me how to pass byte and integer values to generics.

[Gaurangkumar Khalasi]

class Gen1<T>
{
	T ob;
	Gen1(T d)
	{
		ob=d;
	}
	T getOb()
	{
		return ob;
	}
}
public class GenDemo1
 {
	public static void main(String[] args)
       {
                  //Try out the commented portion...
                  Gen1<Integer> iob=new Gen1<Integer>(99);// It is right or  Gen1<Integer> iob=new Gen1<Integer>(new Integer(99));
                  System.out.println(iob.getOb())
                  Gen1<Byte>bob=new Gen1<Byte>(25); // Gen1<Byte>bob=new Gen1<Byte>((byte)25); or Gen1<Byte>bob=new Gen1<Byte>(new Byte("25"));
                  System.out.println(bob.getOb());

      }
}

[Slaxmi Raj]

Thank you for your reply and please tell why we create

New Byte("25")

,and it not accepting implictly.?

[Winston Gutkowski]

Slaxmi Raj wrote:Thank you for your reply and please tell why we create

New Byte("25")

,and it not accepting implictly.?

Because all integer literals (unless they have an 'L' after them) are ints. The compiler can work out that for
new Gen1<Integer>(99);
it needs to autobox the 99, but
new Gen1<Byte>(25);
requires both a narrowing conversion AND boxing, and that it can't do.

And BTW, you don't need to use new Byte(25) (and certainly not new Byte("25")); use Byte.valueOf(25). Much better.

Winston

[Slaxmi Raj]

Thank you so much ,my doubt was clear..
thank you.

[Winston Gutkowski]

Slaxmi Raj wrote:thank you.

You're welcome.

Winston