Convert long to unsigned byte in Java

Casting to byte throws away all but the lowest 8 bits.

long lng = 150;       // 00000000 ... 00000000 10010110
byte b = (byte) lng;  //                       10010110

System.out.println(b);                      // -106
System.out.println(Byte.toUnsignedInt(b));  //  150