U

U-V coordinates (3D graphics), 372

UDP

sockets described, 200–201

multicast protocol, 198–199

Unicode characters and Java, 119

unit vectors, 366

universally unique identifiers (UUIDs), 207–209

UnsafeNativeUtil class, 345, 348

UnsatisfiedLinkError exception, 319

update( ) method, 34–35, 39

updateAll( ) method, 43

Updater interface, 39

updating

Game class, 80–83

scene graphs, 455

the system, 28

UUIDs (universally unique identifiers), types, 207–209