int to char
ok....
i know i can convert from int to char using something like this..
System.out.println((char)65);
but when i want to do something like....
Integer as = 65;
System.out.println((char)as);
then it give me...
/media/hda2/mjalan/Documents/wizard/Wizard.java:421: inconvertible types
found: java.lang.Integer
required:char
System.out.println((char)as);
1 error
now, i am quite confused what i have done wrong since i only change the number to a variable.....
Thanks for any help!
[697 byte] By [
mjalana] at [2007-10-2 11:24:03]
That's because there's a difference between an int and an Integer. One is a primitive and the other an object.
In addition there's a mechanism called autoboxing which atomatically converts between int and Integer.
Appearantly as in the println statement is interpreted as an object. You can do either of these,
int as = 65;
System.out.println((char)as);
or
Integer as = 65;
System.out.println((char)as.intValue());
LRMKa at 2007-7-13 4:28:43 >
You can't cast an Integer to a char.
int is a primitive Type whereas Integer is an Object.
int intValue = 65;
Integer integerValue = new Integer(65);
// that's possible
char chr = (char) intValue;
// that's also possible
chr = integerValue.intValue();
// that does not compile
chr = (char) integerValue;
> You can do either of> these,Or the third one Laszlo suggested. -:)In anyways it pays off to know about the autoboxing conversion that's going on in the background. If you use Eclipse you can get it to warn you when such things happen.
