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E-grāmata: OCA Java SE 8 Programmer I Certification Guide

4.48/5 (143 ratings by Goodreads)
  • Formāts: 704 pages
  • Izdošanas datums: 09-Sep-2016
  • Izdevniecība: Manning Publications
  • Valoda: eng
  • ISBN-13: 9781638356639
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OCA Java SE 8 Programmer I Certification GuidePalielināt
  • Formāts: 704 pages
  • Izdošanas datums: 09-Sep-2016
  • Izdevniecība: Manning Publications
  • Valoda: eng
  • ISBN-13: 9781638356639
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To earn the OCA Java SE 8 Programmer I Certification, readers need to know Java inside and out, and to pass the exam it's good to understand the test itself. This book cracks open the questions, exercises, and expectations readers will face on the OCA exam so they'll be ready and confident on test day.

OCA Java SE 8 Programmer I Certification Guide prepares readers for the 1Z0-808 with complete coverage of all exam topics. The book explores important Java topics and systematically teaches what's required. Each chapter starts with a list of exam objectives mapped to section numbers, followed by sample questions and exercises designed to reinforce key concepts. It provides multiple ways to digest important techniques and concepts, including memorable analogies, diagrams, and flowcharts as well as lots of well-commented code. Along the way readers will also get the scoop on common mistakes and ways to avoid traps and pitfalls.

Purchase of the print book includes a free eBook in PDF, Kindle, and ePub formats from Manning Publications.

Preface xvii
Acknowledgments xix
About this book xxi
About the author xxix
About the cover illustration xxx
Introduction 1(21)
1 Disclaimer
2(1)
2 Introduction to OCA Java SE 8 Programmer I Certification
2(1)
3 The importance of OCA Java SE 8 Programmer I Certification
2(2)
4 Comparing OCA Java exam versions
4(4)
5 Next step: OCP Java SE 8 Programmer II (1Z0-809) exam
8(1)
6 Complete exam objectives, mapped to book chapters, and readiness checklist
8(2)
7 FAQs
10(10)
FAQs on exam preparation
10(8)
FAQs on taking the exam
18(2)
8 The testing engine used in the exam
20(2)
1 Java basics
22(70)
1.1 The structures of a Java class and a source code file
23(13)
Structure of a Java class
24(8)
Structure and components of a Java source code file
32(4)
1.2 Executable Java applications
36(5)
Executable Java classes versus non-executable Java classes
36(1)
The main method
37(2)
Run a Java program from the command line
39(2)
1.3 Java packages
41(10)
The need for packages
42(1)
Defining classes in a package using the package statement
42(3)
Using simple names with import statements
45(2)
Using packaged classes without using the import statement
47(1)
Importing a single member versus all members of a package
48(1)
The import statement doesn't import the whole package tree
49(1)
Importing classes from the default package
50(1)
Static imports
50(1)
1.4 Java access modifiers
51(13)
Access modifiers
52(1)
Public access modifier
53(1)
Protected access modifier
54(3)
Default access (package access)
57(4)
Private access modifier
61(1)
Access modifiers and Java entities
62(2)
1.5 Nonaccess modifiers
64(8)
Abstract Modifier
65(1)
Final Modifier
66(1)
Static Modifier
67(5)
1.6 Features and components of Java
72(2)
Valid features and components of Java
72(2)
Irrelevant features and components of Java
74(1)
1.7 Summary
74(1)
1.8 Review notes
75(4)
1.9 Sample exam questions
79(5)
1.10 Answers to sample exam questions
84(8)
2 Working with Java data types
92(55)
2.1 Primitive variables
93(12)
Category: Boolean
95(1)
Category: signed numeric
96(6)
Category: character (unsigned integer)
102(2)
Confusion with the names of the primitive data types
104(1)
2.2 Identifiers
105(1)
Valid and invalid identifiers
105(1)
2.3 Object reference variables
106(5)
What are object reference variables'?
107(2)
Differentiating between object reference variables and primitive variables
109(2)
2.4 Operators
111(14)
Assignment operators
112(3)
Arithmetic operators
115(4)
Relational operators
119(2)
Logical operators
121(2)
Operator precedence
123(2)
2.5 Wrapper classes
125(7)
Class hierarchy of wrapper classes
125(1)
Creating objects of the wrapper classes
125(1)
Retrieving primitive values from the wrapper classes
126(1)
Parsing a string value to a primitive type
127(1)
Difference between using the value of method and constructors of wrapper classes
128(1)
Comparing objects of wrapper classes
128(2)
Autoboxing and unboxing
130(2)
2.6 Summary
132(1)
2.7 Review notes
132(4)
2.8 Sample exam questions
136(4)
2.9 Answers to sample exam questions
140(7)
3 Methods and encapsulation
147(74)
3.1 Scope of variables
149(9)
Local variables
149(2)
Method parameters
151(1)
Instance variables
152(1)
Class variables
153(2)
Overlapping variable scopes
155(3)
3.2 Object's life cycle
158(8)
An object is born
159(1)
Object is accessible
160(1)
Object is inaccessible
161(2)
Garbage collection
163(3)
3.3 Create methods with arguments and return values
166(8)
Return type of a method
168(1)
Method parameters
169(3)
Return statement
172(2)
3.4 Create an overloaded method
174(4)
Argument list
175(2)
Return type
177(1)
Access level
177(1)
3.5 Constructors of a class
178(10)
User-defined constructors
178(5)
Default constructor
183(2)
Overloaded constructors
185(3)
3.6 Accessing object fields
188(6)
What is an object field?
188(1)
Read and write object fields
189(3)
Calling methods on objects
192(2)
3.7 Apply encapsulation principles to a class
194(3)
Need for encapsulation
195(1)
Apply encapsulation
195(2)
3.8 Passing objects and primitives to methods
197(5)
Passing primitives to methods
198(1)
Passing object references to methods
199(3)
3.9 Summary
202(1)
3.10 Review notes
203(4)
3.11 Sample exam questions
207(5)
3.12 Answers to sample exam questions
212(9)
4 Selected classes from the Java API and arrays
221(101)
4.1 Welcome to the world of the String class
223(16)
Creating String objects
223(4)
The class String is immutable
227(3)
Methods of the class String
230(5)
String objects and operators
235(1)
Determining equality of Strings
236(3)
4.2 Mutable strings: StringBuilder
239(8)
The StringBuilder class is mutable
239(1)
Creating StringBuilder objects
240(1)
Methods of class StringBuilder
241(6)
A quick note on the class StringBuffer
247(1)
4.3 Arrays
247(11)
What is an array?
248(1)
Array declaration
249(1)
Array allocation
250(2)
Array initialization
252(2)
Combining array declaration, allocation, and initialization
254(1)
Asymmetrical multidimensional arrays
255(1)
Arrays of type interface, abstract class, and class Object
256(2)
Members of an array
258(1)
4.4 ArrayList
258(15)
Creating an ArrayList
259(2)
Adding elements to an ArrayList
261(2)
Accessing elements of an ArrayList
263(2)
Modifying the elements of an ArrayList
265(1)
Deleting the elements of an ArrayList
266(1)
Other methods of ArrayList
267(6)
4.5 Comparing objects for equality
273(5)
The method equals in the class Java.lang.Object
273(1)
Comparing objects of a user-defined class
273(2)
Incorrect method signature of the equals method
275(1)
Contract of the equals method
276(2)
4.6 Working with calendar data
278(19)
LocalDate
279(3)
LocalTime
282(3)
LocalDateTime
285(1)
Period
286(5)
DateTimeFormatter
291(6)
4.7 Summary
297(2)
4.8 Review notes
299(10)
4.9 Sample exam questions
309(4)
4.10 Answers to sample exam questions
313(9)
5 Flow control
322(62)
5.1 The if, if-else, and ternary constructs
324(14)
The if construct audits flavors
324(4)
Missing else blocks
328(1)
Implications of the presence and absence of {} in if-else constructs
328(3)
Appropriate versus inappropriate expressions passed as arguments to an if statement
331(1)
Nested if constructs
332(2)
Ternary construct
334(4)
5.2 The switch statement
338(8)
Create and use a switch statement
339(1)
Comparing a switch statement with multiple if-else constructs
339(2)
Arguments passed to a switch statement
341(2)
Values passed to the label case of a switch statement
343(2)
Use of break statements within a switch statement
345(1)
5.3 The for loop
346(6)
Initialization block
348(1)
Termination condition
349(1)
The update clause
349(1)
Optional parts of a for statement
350(1)
Nested for loop
351(1)
5.4 The enhanced for loop
352(6)
Iteration with enhanced for loop
352(3)
Limitations of the enhanced for loop
355(1)
Nested enhanced for loop
356(2)
5.5 The while and do-while loops
358(4)
The while loop
358(2)
The do-while loop
360(2)
While and do-while block, expression, and nesting rules
362(1)
5.6 Comparing loop constructs
362(2)
Comparing do-while and while loops
362(1)
Comparing for and enhanced for loops
363(1)
Comparing for and while loops
364(1)
5.7 Loop statements: break and continue
364(4)
The break statement
364(2)
The continue statement
366(1)
Labeled statements
367(1)
5.8 Summary
368(1)
5.9 Review notes
369(3)
5.10 Sample exam questions
372(5)
5.11 Answers to sample exam questions
377(7)
6 Working with inheritance
384(85)
6.1 Inheritance with classes
385(9)
The need to inherit classes
385(2)
Benefits
387(3)
A derived class contains within it an object of its base class
390(1)
Which base class members are inherited by a derived class?
391(1)
Which base class members aren't inherited by a derived class?
391(1)
Derived classes can define additional properties and behaviors
391(1)
Abstract base class versus concrete base class
392(2)
6.2 Use interfaces
394(24)
Need for using interfaces
396(2)
Defining interfaces
398(3)
Types of methods in an interface
401(4)
Implementing a single interface
405(2)
A class can't extend multiple classes
407(1)
A class can implement multiple interfaces
408(3)
Extending interfaces
411(3)
Modifying existing methods of an interface
414(3)
Properties of members of an interface
417(1)
6.3 Reference variable and object types
418(6)
Using a variable of the derived class to access its own object
418(1)
Using a variable of a superclass to access an object of a derived class
419(1)
Using a variable of an implemented interface to access a derived class object
420(1)
The need for accessing an object using the variables of its base class or implemented interfaces
421(3)
6.4 Casting
424(3)
How to cast a variable to another type
424(2)
Need for casting
426(1)
6.5 Use this and super to access objects and constructors
427(7)
Object reference: this
427(3)
Object reference: super
430(4)
6.6 Polymorphism
434(12)
Polymorphism with classes
434(5)
Binding of variables and methods at compile time and runtime
439(2)
Polymorphism with interfaces
441(5)
6.7 Simple lambda expressions
446(6)
Comparing passing values with passing code to methods
446(3)
Syntax of lambda expressions
449(1)
Interface Predicate
450(2)
6.8 Summary
452(1)
6.9 Review notes
453(3)
6.10 Sample exam questions
456(5)
6.11 Answers to sample exam questions
461(8)
7 Exception handling
469(70)
7.1 Exceptions in Java
470(5)
A taste of exceptions
470(3)
Why handle exceptions separately?
473(1)
Does exception handling offer any other benefits?
474(1)
7.2 Categories of exceptions
475(4)
Identifying exception categories
476(1)
Class hierarchy of exception classes
476(1)
Checked exceptions
477(1)
Runtime exceptions
478(1)
Errors
478(1)
7.3 Creating a method that throws an exception
479(4)
Create a method that throws a checked exception
480(1)
Handle-or-declare rule
481(1)
Creating a method that throws runtime exceptions or errors
481(1)
A method can declare to throw all types of exceptions, even if it doesn't
482(1)
7.4 What happens when an exception is thrown?
483(20)
Creating try-catch-finally blocks
485(5)
Using a method that throws a checked exception
490(1)
Using a method that throws a runtime exception
491(2)
Using a method that throws an error
493(1)
Will a finally block execute even if the catch block defines a return statement?
493(1)
What happens if both a catch and a finally block define return statements?
494(1)
What happens if a finally block modifies the value returned from a catch block?
495(1)
Can a try block be followed only by a finally block?
496(1)
Does the order of the exceptions caught in the catch blocks matter?
497(2)
Can I rethrow an exception or the error I catch?
499(1)
Can I declare my methods to throw a checked exception instead of handling it?
500(1)
I can create nested hops, so can I create nested try-catch blocks too?
500(2)
Should I handle errors?
502(1)
7.5 Common exception classes and categories
503(17)
ArrayIndexOutOfBoundsException and IndexOutOfBoundsException
504(1)
ClassCastException
505(2)
IllegalArgumentException
507(1)
NullPointerException
508(3)
ArithmeticException
511(3)
NumberFormatException
514(2)
ExceptionInInitializerError
516(2)
StackOverflowError
518(1)
NoClassDefFoundError
519(1)
OutOfMemoryError
519(1)
7.6 Summary
520(1)
7.7 Review notes
520(6)
7.8 Sample exam questions
526(4)
7.9 Answers to sample exam questions
530(9)
8 Full mock exam
539(102)
8.1 Mock exam
539(35)
8.2 Answers to mock exam questions
574(67)
Appendix Answers to Twist in the Tale exercises 641(18)
Index 659
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