book

The Java Workshop

by David Cuartielles, Pradeep Kumar Gupta, Scott Cosentino, Andreas Göransson, Eric Foster-Johnson, Avinash Kate

October 2019

Beginner

606 pages

10h 37m

English

Packt Publishing

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About the BookAbout the ChaptersConventionsBefore You BeginInstallation of JREInstallation of JDKInstallation of IntelliJ IDEAInstalling the Code Bundle
IntroductionWriting, Compiling, and Executing Your Hello World ProgramExercise 1: Creating Your Hello World Program in JavaBasic Syntax and Naming ConventionsPrinting Out Different Data TypesVariables and Variable TypesExercise 2: Printing Different Types of DataPrimitive versus Reference Data TypesNullChars and StringsExercise 3: Declaring StringsDoing Some MathExercise 4: Solving a Simple Trigonometry ProblemComments Help You to Share CodeCLI versus GUIExercise 5: Running the Code from the CLIActivity 1: Obtaining the Minimum of Two NumbersSummary
IntroductionControlling the Flow of Your ProgramsExercise 1: Creating a Basic if StatementComparison OperatorsExercise 2: Using Java Comparison OperatorsNested if StatementsExercise 3: Implementing a Nested if StatementBranching Two Ways with if and elseExercise 4: Using if and else StatementsUsing Complex ConditionalsExercise 5: Using Logical Operators to Create Complex ConditionalsUsing Arithmetic Operators in an if ConditionThe Ternary OperatorExercise 6: Using the Ternary OperatorEquality Can Be TrickyExercise 7: Comparing Decimal ValuesComparing StringsUsing switch StatementsExercise 8: Using switchExercise 9: Allowing Cases to Fall ThroughUsing Java 12 Enhanced switch StatementsExercise 10: Using Java 12 switch StatementsLooping and Performing Repetitive TasksLooping with the for LoopExercise 11: Using a Classic for LoopExercise 12: Using an Enhanced for LoopJumping Out of Loops with Break and ContinueExercise 13: Using break and continueUsing the while LoopExercise 14: Using a while LoopUsing the do-while LoopHandling Command-Line ArgumentsExercise 15: Testing Command-Line ArgumentsConverting Command-Line ArgumentsExercise 16: Converting String to Integers and DoublesDiving Deeper into Variables — ImmutabilityComparing Final and ImmutableUsing Static ValuesUsing Local Variable Type InferenceActivity 1: Taking Input and Comparing RangesSummary
IntroductionThe Anatomy of a ClassWorking with Objects in JavaChecking the Precedence of a Class with instanceofExercise 1: Creating the WordTool ClassActivity 1: Adding the Frequency-of-Symbol Calculation to WordToolInheritance in JavaOverriding and Hiding MethodsAvoiding Overriding: Final Classes and MethodsOverloading Methods and ConstructorsRecursionAnnotationsInterfacesInner ClassesDocumenting with JavaDocActivity 2: Adding Documentation to WordToolSummary
IntroductionArraysActivity 1: Searching for Multiple Occurrences in an ArraySetsListsExercise 1: Creating the AnalyzeInput ApplicationMapsIterating through CollectionsExercise 2: Bringing Analytics into the AnalyzeInput ApplicationSorting CollectionsExercise 3: Sort the Results from the AnalyzeInput ApplicationPropertiesActivity 2: Iterating through Large ListsSummary
IntroductionA Simple Exception ExampleNullPointerException – Have No FearCatching ExceptionsExercise 1: Logging ExceptionsThrows and ThrowExercise 2: Breaking the Law (and Fixing It)The finally BlockActivity 1: Designing an Exception Class Logging DataBest Practices for Handling ExceptionsWhere Do Exceptions Come from?Summary
IntroductionOrganizing Code into PackagesImporting ClassesExercise 1: Importing ClassesFully Qualified Class NamesImporting All Classes in a PackageDealing with Duplicated NamesStatic ImportsCreating a PackageNaming Your PackageDirectories and PackagesExercise 2: Creating a Package for a Fitness Tracking AppBuilding JAR FilesExercise 3: Building a JAR FileDefining the ManifestExercise 4: Building an Executable JAR FileBuild ToolsMavenExercise 5: Creating a Maven ProjectExercise 6: Adding Java Sources to the Maven ProjectExercise 7: Building the Maven ProjectExercise 8: Creating an Executable JAR with MavenUsing GradleExercise 9: Creating a Gradle ProjectExercise 10: Building an Executable JAR with GradleUsing Third-Party LibrariesFinding the LibrariesAdding a Project DependencyExercise 11: Adding a Third-Party Library DependencyUsing the Apache Commons Lang LibraryExercise 12: Using the Apache Commons Lang LibraryUsing ModulesCreating ModulesExercise 13: Creating a Project for a ModuleExercise 14: Creating a Second Module Using the First OneActivity 1: Tracking Summer High TemperaturesSummary
IntroductionRelational DatabasesRelational Database Management SystemsInstalling a DatabaseExercise 1: Running the H2 DatabaseIntroducing SQLExercise 2: Creating the customer TableInserting Data into a TableExercise 3: Inserting DataRetrieving DataRelating TablesExercise 4: Creating the email TableSelecting Data from Multiple TablesModifying Existing RowsExercise 5: Modifying email DataDeleting DataJDBC—Accessing Databases from JavaConnecting to DatabasesQuerying Data with JDBCExercise 6: Querying Data with JDBCSanitizing User InputUsing Prepared StatementsTransactions and RollbackExercise 7: Using Prepared Statements with TransactionsSimplifying JDBC ProgrammingUsing Object-Relational Mapping SoftwareDatabase Connection PoolingNon-Relational, or NoSQL, DatabasesActivity 1: Track Your ProgressSummary
IntroductionListing Files and DirectoriesSeparating Directories from FilesExercise 1: Listing the Contents of SubdirectoriesCreating and Writing to a FileActivity 1: Writing the Directory Structure to a FileReading an Existing FileReading a Properties FileExercise 2: Creating a Properties File from the CLIWhat are Streams?The Different Streams of the Java LanguageWhat are Sockets?Creating a SocketServerWriting Data on and Reading Data from a SocketActivity 2: Improving the EchoServer and EchoClient ProgramsBlocking and Non-Blocking CallsSummary
IntroductionExploring HTTPHTTP Request MethodsRepresentational State TransferRequest HeadersUsing HttpUrlConnectionExercise 1: Creating a HEAD RequestReading the Response Data with a GET RequestExercise 2: Creating a GET RequestDealing with Slow ConnectionsRequesting ParametersHandling RedirectsCreating HTTP POST RequestsExercise 3: Sending JSON Data with POST RequestsParsing HTML DataExercise 4: Using jsoup to Extract Data from HTMLDelving into the java.net.http ModuleExercise 5: Getting HTML Contents Using the java.net.http ModuleActivity 1: Using the jsoup Library to Download Files from the WebSummary

IntroductionPlaintextCiphertextCiphersKeysSymmetric Key EncryptionExercise 1: Encrypting the String Using Advanced Encryption StandardBlock CiphersInitialization VectorsStream CiphersAsymmetric Key EncryptionExercise 2: Encrypting the String Using the RSA Asymmetric Key EncryptionEncrypting FilesExercise 3: Encrypting a FileSummary
IntroductionLaunching a ProcessSending Input to a Child ProcessCapturing the Output of a Child ProcessStoring the Output of a Child Process in a FileActivity 1: Making a Parent Process to Launch a Child ProcessSummary
IntroductionDecrypting Regular ExpressionsCharacter ClassesCharacter SetsQuantifiersAnchorsCapturing GroupsEscaped CharactersFlagsExercise 1: Implementing Regular Expressions Activity 1: Regular Expressions to Check If the Entrance is Entered in the Desired FormatRegular Expressions in JavaExercise 2: Extracting the Domain Using Pattern MatchingExercise 3: Extracting Links Using Pattern MatchingSummary
IntroductionBackgroundFunctional ProgrammingSide EffectsDeterministic FunctionsPure FunctionsExercise 1: Writing Pure Functions Immutability of StateExercise 2: Creating an Immutable ClassActivity 1: Modifying Immutable ListsImmutable CollectionsExercise 3: Overriding the String MethodFunctional InterfacesLambda ExpressionsExercise 4: Listing Spare TiresSummary
IntroductionDelving into RecursionExercise 1: Using Recursion to Overflow the StackTrying Tail RecursionExercise 2: Using Recursion to Calculate FactorialsProcessing an XML DocumentExercise 3: Creating an XML FileIntroducing the DOM XML APIExercise 4: Traversing an XML DocumentActivity 1: Calculating the Fibonacci SequenceSummary
IntroductionCreating StreamsParallel StreamsEncounter OrderClosing StreamsTerminal OperationsIntermediate OperationsExercise 1: Using the Stream APIActivity 1: Applying Discount on the ItemsUsing CollectorsI/O StreamsExercise 2: Converting CSV to a ListActivity 2: Searching for SpecificsSummary
IntroductionPredicate InterfaceExercise 1: Defining a predicateActivity 1: Toggling the Sensor StatesConsumer InterfaceExercise 2: Producing Side EffectsFunctionExercise 3: Extracting DataActivity 2: Using a Recursive FunctionActivity 3: Using a Lambda FunctionSummary
IntroductionPublisherSubmissionPublisherSubscriberSubscriptionExercise 1: A Simple Application with a Single Publisher and a Single SubscriberProcessorExercise 2: Using a Processor to Convert a Stream of Strings to NumbersActivity 1: Let NumberProcessor Format Values as IntegersSummary
IntroductionGetting Started with Unit TestsIntroducing JUnitWriting Unit Tests with JUnitExercise 1: Writing a First Unit TestExercise 2: Writing a Successful TestDeciding What to TestWriting Parameterized TestsExercise 3: Writing a Parameterized TestWhen Tests Won't Work—Disabling TestsTest SetupExercise 4: Using Test Setup and Cleanup MethodsMockingTesting with Mocks Using MockitoExercise 5: Using Mocks when TestingActivity 1: Counting the Words in the StringSummary
1. Getting StartedActivity 1: Obtaining the Minimum of Two Numbers2. Learning the BasicsActivity 1: Taking Input and Comparing Ranges3. Object-Oriented ProgrammingActivity 1: Adding the Frequency-of-Symbol Calculation to WordToolActivity 2: Adding Documentation to WordTool4. Collections, List, and Java's Built-In APIsActivity 1: Searching for Multiple Occurrences in an ArrayActivity 2: Iterating through Large Lists5. ExceptionsActivity 1: Designing an Exception Class Logging Data6. Libraries, Packages, and ModulesActivity 1: Tracking Summer High Temperatures7. Databases and JDBCActivity 1: Track Your Progress8. Sockets, Files, and StreamsActivity 1: Writing the Directory Structure to a FileActivity 2: Improving the EchoServer and EchoClient Programs9. Working with HTTPActivity 1: Using the jsoup Library to Download Files from the Web11. ProcessesActivity 1: Making a Parent Process to Launch a Child Process12. Regular ExpressionsActivity 1: Regular Expressions to Check If the Entrance is Entered in the Desired Format13. Functional Programming with Lambda ExpressionsActivity 1: Modifying Immutable Lists14. RecursionActivity 1: Calculating the Fibonacci Sequence15. Processing Data with StreamsActivity 1: Applying Discount on the ItemsActivity 2: Searching for Specifics16. Predicates and Other Functional InterfacesActivity 1: Toggling the Sensor StatesActivity 2: Using a Recursive FunctionActivity 3: Using a Lambda Function17. Reactive Programming with Java FlowActivity 1: Let NumberProcessor Format Values as Integers18. Unit TestingActivity 1: Counting the Words in the String
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Content preview from The Java Workshop

5. Exceptions

Overview

This chapter discusses how exceptions are dealt with in Java. You will first learn how to identify the situations that produce exceptions in your code. This knowledge will simplify the process of handling these exceptions by alerting you to those circumstances in which they are most likely to arise. In this endeavor, this chapter also provides a list of best practices guiding you through common scenarios and the best methods of either catching exceptions or throwing them to the calling class, logging their details as you go. You will further learn to differentiate between different types of exceptions, and practice the techniques for handling each. By the end of the chapter, you will even be able to create your ...

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Publisher Resources

ISBN: 9781838986698Supplemental Content

The Java Workshop

by David Cuartielles, Pradeep Kumar Gupta, Scott Cosentino, Andreas Göransson, Eric Foster-Johnson, Avinash Kate

5. Exceptions

Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.