Bit operations on short

Question

I use a technology called DDS and in IDL, it does not support int . So, I decided that I was just using short . I don't need so many bits. However, when I do this:

 short bit = 0; System.out.println(bit); bit = bit | 0x00000001; System.out.println(bit); bit = bit & ~0x00000001; bit = bit | 0x00000002; System.out.println(bit); 

It says: "Type of mismatch: cannot be converted from int to short." When I change short to long , it works fine.

Is it possible to perform bitwise operations like this on short in Java?

Answer 1

When doing any arithmetic on byte , short or char numbers advance to the wider int type. To solve your problem, explicitly return the result to short :

 bit = (short)(bit | 0x00000001); 

References:

• Stack Overflow: Java Promotion?
• The Java language specification in section 5.6: http://java.sun.com/docs/books/jls/second_edition/html/conversions.doc.html#26917

Answer 2

I understand that java does not support short literals. But it helped me:

 short bit = 0; short one = 1; short two = 2; short other = (short)~one; System.out.println(bit); bit |= one; System.out.println(bit); bit &= other; bit |= two; System.out.println(bit);