I

I/O (input/output)

combining I/O classes, 435–438

creating files with File class, 431–432

File Writer and FileReader classes, 433–435

I/O classes, 429–430

self test answers, 508–520

self test questions, 498–507

StringBuffer and StringBuilder and, 425

two-minute drill, 494–495

working with files and directories, 438–443

identifiers, 4–10

assertions and, 375–376

Java Beans naming standards, 8–10

Java Code Conventions, 6–8

legal, 5

overview, 2–4

two-minute drill, 68

if-else, 317–320

if statements

if-else, 317–320

legal expressions of, 320–322

overview, 316

two-minute drill, 385

if test, 278

immutability, of strings, 412–419

implementation class, 115–121

implements, 120–121

import statements, 11

increment (++) operator, 290–291, 300

inheritance, 86–90

code reuse and, 87–88

example, 86–87

HAS-A relationships, 92–94

IS-A relationships, 90–91

Java refresher, 3

multiple inheritance, 96

polymorphism and, 88–90

serialization and, 452–456

two-minute drill, 153

initialization

arrays, 214–216, 256

for loops, 334

unassigned and uninitialized variables or arrays, 193

initialization blocks, 224–227, 257

inner classes, 636–672

anonymous, flavor one, 647–651

anonymous, flavor two, 651–652

argument-defined anonymous, 652–654

creating inner class instance from outer class instance, 640–642

instantiating, 640

member modifiers applied to, 644

method-local, 644–646

overview, 636–638

regular, 638–639

self test answers, 665–672

self test questions, 659–664

static nested classes, 654–656

syntax, 649

this reference for, 642–643

two-minute drill, 657

insert(), 427, 578–579

instance methods, polymorphism, 98

instance variables

arrays, 196–197

default details of class member, 36–38

in heap memory, 174

primitives, 194

protected details of class member, 34–36

references, 194–196

serialization and, 456

variable declaration and, 51–53

variable scope and, 191

instanceof operator

compiler error, 285–286

overview, 283–285

two-minute drill, 299

instantiation

constructors, 140–141

inner classes, 640

objects, 126–128

static nested classes, 655

threads, 678–680

two-minute drill, 155–157

int, 324

integer literals, 176

interfaces

anonymous inner classes and, 652

in Collections Framework, 537–538

constants, 22–23

declaring, 19–22

extending itself to another interface, 118–119

extends and implements used with, 120–121

functions of nonabstract implementation class, 117

implementing, 115–121

instanceof operator, 284

Java refresher, 3

two-minute drill, 69–70, 155

IS-A relationships

in inheritance, 90–91

instanceof operator and, 283

two-minute drill, 153

ISO 639 Language Code, 466

isolating a reference, garbage collection, 249–250

iteration

continue and, 340–341

for loops and, 333, 335–336

iterators

hasNext(), 560

next(), 560

overview, 331