Core Java® Volume I–Fundamentals

287

Chapter 6: Interfaces, Lambda Expressions, and Inner Classes ............

288

Interfaces ...................................................................................................

6.1

288

The Interface Concept ...............................................................

6.1.1

ix

Contents

From the Library of Hristo Dimov Hristov

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ptg18360597

295

Properties of Interfaces .............................................................

6.1.2

297

Interfaces and Abstract Classes ...............................................

6.1.3

298

Static Methods ............................................................................

6.1.4

298

Default Methods ........................................................................

6.1.5

300

Resolving Default Method Conflicts .......................................

6.1.6

302

Examples of Interfaces ............................................................................

6.2

302

Interfaces and Callbacks ...........................................................

6.2.1

305

The 

Comparator

 Interface ................................................................

6.2.2

306

Object Cloning ...........................................................................

6.2.3

314

Lambda Expressions ...............................................................................

6.3

314

Why Lambdas? ..........................................................................

6.3.1

315

The Syntax of Lambda Expressions ........................................

6.3.2

318

Functional Interfaces .................................................................

6.3.3

319

Method References ....................................................................

6.3.4

321

Constructor References .............................................................

6.3.5

322

Variable Scope ............................................................................

6.3.6

324

Processing Lambda Expressions .............................................

6.3.7

328

More about Comparators .........................................................

6.3.8

329

Inner Classes .............................................................................................

6.4

331

Use of an Inner Class to Access Object State .........................

6.4.1

334

Special Syntax Rules for Inner Classes ...................................

6.4.2

335

Are Inner Classes Useful? Actually Necessary? Secure? ......

6.4.3

339

Local Inner Classes ....................................................................

6.4.4

339

Accessing Variables from Outer Methods ..............................

6.4.5

342

Anonymous Inner Classes .......................................................

6.4.6

346

Static Inner Classes ....................................................................

6.4.7

350

Proxies .......................................................................................................

6.5

350

When to Use Proxies .................................................................

6.5.1

350

Creating Proxy Objects .............................................................

6.5.2

355

Properties of Proxy Classes ......................................................

6.5.3