Behaviour of unsigned right shift applied to byte variable

Question

Consider the following snip of java code

byte b=(byte) 0xf1;
byte c=(byte)(b>>4);
byte d=(byte) (b>>>4);

output:

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Answer 1

The problem is that all arguments are first promoted to int before the shift operation takes place:

byte b = (byte) 0xf1;

b is signed, so its value is -15.

byte c = (byte) (b >> 4);

b is first sign-extended to the integer -15 = 0xfffffff1, then shifted right to 0xffffffff and truncated to 0xff by the cast to byte.

byte d = (byte) (b >>> 4);

b is first sign-extended to the integer -15 = 0xfffffff1, then shifted right to 0x0fffffff and truncated to 0xff by the cast to byte.

You can do (b & 0xff) >>> 4 to get the desired effect.