widening and boxing...

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code

class WidenAndBox {
static void go(Long x) { System.out.println("Long"); }

public static void main(String [] args) {
byte b = 5;
go(b); // must widen then box - illegal
}
}

// why cant i widen first and then box... byte can be widened to long and then long can be boxed to Long... then why is it illegal...

// why cant i widen first and then box... byte can be widened to long and then long can be boxed to Long... then why is it illegal...

Simply, because it doesn't. The specification is very specific on what it does.

If you want it to widen and then box, you have to explicitedly widen it first.

Henry