Casting may lose information...
Narrowing:
(byte)127 == 127
(byte)255 == -1
(int)12.8f == 12
(int)(4.56 * 100) == 455
Widening, which is implicit, is usually ok:
(long)5000034 == 5000034
1234567890 - (int)1234567890f == -46