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return type problem

sambasivarao laghuvarapu
Greenhorn

Joined: Jun 07, 2007
Posts: 9
class Test {

public static void main(String[] args) {
m1();
}
static byte m1( ) {
final char c1 ='2';
return c1; //line 1
}
static byte m2(final char c2) {
c2='3';
return c2; //line 2
}
}

while i am compiling this code i am getting compiler error at line 2 only.i am not getting compiler error at line 1 why.please help anybody.
Jesper de Jong
Java Cowboy
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Joined: Aug 16, 2005
Posts: 13875
    
  10

Please do not post the same question multiple times.

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[ September 02, 2007: Message edited by: Jesper Young ]

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Burkhard Hassel
Ranch Hand

Joined: Aug 25, 2006
Posts: 1274
Howdy Sam!

Welcome to the ranch!




I added a little comment to your code

You won't get a compiler error on line 1. char c1 is final and has one value once and for all. The char value of '2' can be converted into an int value of 50. This is a value that fits also into the byte range of a byte.

But you will get an error in line 2. The compiler sees that it gets a value that might have changed.
You should also get an error in the "line in the middle" because you try to change a final variable. But the compiler sees the error in line 2 first and does not report the other one.
If you change line 2 to return 1; (which is a legal return for a byte) then compiler would mark an error in the line in the middle: "final parameter c2 may not be assigned".

If you change the whole method to

Then the former line 2 is also wrong, because you cannot give a char back because it doesn't fit always into a byte.
It does not help now that the char is final. Because you could easily invoke the method with a char value of - say '\u0080' (128, just one too big).



Yours,
Bu.


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