Journal Article - SCJP Tip Line - Implicit Conversions, Explicitly

[Dirk Schreckmann]

The just-released October 2004 edition of The JavaRanch Journal includes an article by Corey McGlone, "The SCJP Tip Line - Implicit Conversions, Explicitly".

Please use this thread to comment on and discuss the article.

[pradyot sikdar]

There is an exception to "narrowing conversion".
In case of "narrowing conversion" we always do explicit casting.Like if we are assining an int value to a byte value.
int i = 10;
byte b = (byte)i;
But we can also do narrowing conversion with out any explicit casting.
For this we have to remember two things.
1) The value which we are going to assign must be final.
2) The value which we are going to assign should accommodate well into the data type length of the variable where we are going to assign.
For example,
final int i = 10;
byte b = i;
This will not give any compilation error.
final int i = 129;
byte b = i;
But this will give any compilation error.Here we need explicit casting.