U

UML (Unified Modeling Language), 93

Unicode characters, 412–413

Unified Modeling Language (UML), 93

uninitialized and unassigned arrays, 256

uninitialized and unassigned variables, 256

UNIX paths, 768

unlabeled statements, flow control, 341–342

valueOf() methods, 231

var-args (variable arguments)

overloading and, 238–240, 243–244

overview, 46–47

two-minute drill, 72

variable declarations, 49

arrays, 55–57

in enums, 63–65

final variables, 57–58

instance variables, 51–53

local variables, 53–55

primitives and primitive ranges, 49–51

reference variables, 51

static variables and methods, 59–60

transient variables, 59

two-minute drill, 72

volatile variables, 59

variable scope, 190–193

variables

assigning laterals that are too large for the variable, 186–187

local variables, 38–39

naming conventions, 7–8

object reference variables, 203–204

passing into methods, 203, 256

passing primitive variables, 205–206

scope, 190–193

state (instance variables), 2

unassigned and uninitialized, 193, 256

variable arguments lists with methods, 46–47

Vector, List interface, 542

Volatile, variable declarations, 59