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Primitive stuff in SCJP..

HI,

I have just started preparing for SCJP 1.4..I am studying Kathy Sierra and Bert Bates ,All in One Java 2 Book..

I see a section where primitves are explained..and i felt some confusions ...

char c = (char) -98 //Legal

The character is unsigned 16 bit so,how it can be negetive..And again when i am doing a println for any negetive value (-98 0r -29 ,70000etc) I am getting the output> ? .

char d = (char) 70000;

System.out.println("char d = " + d);

//Output

char d = ?

Can any one please explain wat's happening here?

Thanks in advance.

[611 byte] By [profilemia] at [2007-11-27 9:43:12]
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# 1

Here is basically what's happening:

-98 is an int litteral. Its binary representation (two's complement) is:11111111111111111111111110011110

the (char) applies a narrowing conversion to -98, thus keeping only the 16 lowest order bits:1111111110011110

the value above represents the number 65438 (remember, the char type is unsigned.)

It is therefore the value of the c variable, and represents a Unicode code point (the HALFWIDTH KATAKANA VOICED SOUND MARK character), which your console is not able to display. Therefore, it converts it into a question mark, as it does for all the characters that are not part of its charset.

TimTheEnchantora at 2007-7-12 23:48:07 > top of Java-index,Java Essentials,Training...
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