V

U

UDP 554, 565

UML 13, 210, 244, 260

class diagram 213

composite aggregation 247, 249

expressing abstract class 277

expressing inheritance 268

expressing interfaces 280

expressing realization 280

expression aggregation 246

realization

diagram

expanded form 281

simple form 281

sequence diagram

aircraft engine object creation 254

sequence diagrams 250, 251

simple aggregation 246, 247

using to tame conceptual complexity 244

UML class diagram

purpose of 213

UnicastRemoteObject 599

example use of 597

usage of 571

UNICODE 29

Unified Modeling Language (UML) 13

UNIX

killing processes 560

listing processes 560

URI 554

URL 554

URL class

use of 568

User Datagram Protocol (UDP) 565

user-defined types 211

UTF Strings 584

reading 584

writing 584

UTFDataFormatException 584

utility methods

definition of 216