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Day 2

Gradle, TDD

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Building Your Application

What does it take to build your Java application?

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Building Your Application

What does it take to build your Java application?

  • Your Java code has to be compiled
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Building Your Application

What does it take to build your Java application?

  • Your Java code has to be compiled
  • Finding and organizing code files you didn’t write (third party files)
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Building Your Application

What does it take to build your Java application?

  • Your Java code has to be compiled
  • Finding and organizing code files you didn’t write (third party files)
  • CSS, HTML, and JavaScript if you are making a web app
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Building Your Application

What does it take to build your Java application?

  • Your Java code has to be compiled
  • Finding and organizing code files you didn’t write (third party files)
  • CSS, HTML, and JavaScript if you are making a web app
  • Misc files: csv, database, settings...
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Third Party Libraries

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Third Party Libraries

  • Have to be downloaded and referenced in your code
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Third Party Libraries

  • Have to be downloaded and referenced in your code
  • The libraries could be...
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Third Party Libraries

  • Have to be downloaded and referenced in your code
  • The libraries could be...
  • Common logic used by all your team’s projects
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Third Party Libraries

  • Have to be downloaded and referenced in your code
  • The libraries could be...
  • Common logic used by all your team’s projects
  • Third party libraries for
    • Charts
    • Database framework
    • MVC framework
    • Test runners
    • etc
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Transivite Dependencies

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Transivite Dependencies

  • Some libraries require other libraries to work
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Transivite Dependencies

  • Some libraries require other libraries to work
  • You want to use library A
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Transivite Dependencies

  • Some libraries require other libraries to work
  • You want to use library A
  • Turns out Library A requires library B and C
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Transivite Dependencies

  • Some libraries require other libraries to work
  • You want to use library A
  • Turns out Library A requires library B and C
  • You have to include libraries A, B and C in your project
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Transivite Dependencies

  • Some libraries require other libraries to work
  • You want to use library A
  • Turns out Library A requires library B and C
  • You have to include libraries A, B and C in your project
  • This can be hard to manage when you use a lot of libraries
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Transivite Dependencies

  • Some libraries require other libraries to work
  • You want to use library A
  • Turns out Library A requires library B and C
  • You have to include libraries A, B and C in your project
  • This can be hard to manage when you use a lot of libraries
    • Also keeping your libraries up to date is a pain as well
    • Not only up to date, but everyone using the same verisons
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Build Artifacts

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Build Artifacts

  • File or files that result form your project being built
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Build Artifacts

  • File or files that result form your project being built
  • .class files compiled by javac command
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Build Artifacts

  • File or files that result form your project being built
  • .class files compiled by javac command
  • .jar files created by jar commnad
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Build Artifacts

  • File or files that result form your project being built
  • .class files compiled by javac command
  • .jar files created by jar commnad
  • test results
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What are our current build tools?

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What are our current build tools?

  • Intellij
  • Javac
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Hello Gradle

  • Gradle is a Build Automation System (straight from wiki page)
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Hello Gradle

  • Gradle is a Build Automation System (straight from wiki page)
  • Can be configured to...
    • Build your project
    • Run your tests
    • Deploy your code
    • Analyze your code
    • Creates your project artifacts
    • Download and Manage Dependencies
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Gradle - Dependency Management

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Gradle - Dependency Management

  • Manages Dependencies (libraries)
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Gradle - Dependency Management

  • Manages Dependencies (libraries)
  • Correct version of the library
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Gradle - Dependency Management

  • Manages Dependencies (libraries)
  • Correct version of the library
  • Transitive libraries
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Gradle - Dependency Management

  • Manages Dependencies (libraries)
  • Correct version of the library
  • Transitive libraries
  • Dependency conflict resolution
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Gradle - Dependency Management

  • Manages Dependencies (libraries)
  • Correct version of the library
  • Transitive libraries
  • Dependency conflict resolution
  • Repository where libraries are stored (remote and locally)
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Gradle - Dependency Management

  • Manages Dependencies (libraries)
  • Correct version of the library
  • Transitive libraries
  • Dependency conflict resolution
  • Repository where libraries are stored (remote and locally)
    • All the jar files have to be stored somewhere
    • A repository catalogs the libraries by name and version
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How to Configure Gradle

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How to Configure Gradle

  • build.gradle <- the key to it all
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How to Configure Gradle

  • build.gradle <- the key to it all
    • contains the dependencies you want
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How to Configure Gradle

  • build.gradle <- the key to it all
    • contains the dependencies you want
    • lists the tasks configurations you need
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How to Configure Gradle

  • build.gradle <- the key to it all
    • contains the dependencies you want
    • lists the tasks configurations you need
    • lists the plugins you want to use
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How to Configure Gradle

  • build.gradle <- the key to it all
    • contains the dependencies you want
    • lists the tasks configurations you need
    • lists the plugins you want to use
  • Gradle plugins add tasks to gradle
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How to use Gralde with Intellij

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How to use Gralde with Intellij

  • You can create a project with Gradle ready to use
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How to use Gralde with Intellij

  • You can create a project with Gradle ready to use
  • Shows gradle tasks in a special window
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How to use Gralde with Intellij

  • You can create a project with Gradle ready to use
  • Shows gradle tasks in a special window
  • Shows dependencies listed in the gradle file
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How to use Gralde with Intellij

  • You can create a project with Gradle ready to use
  • Shows gradle tasks in a special window
  • Shows dependencies listed in the gradle file
  • You can search for and add dependencies via Generate command
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How to use Gralde with Intellij

  • You can create a project with Gradle ready to use
  • Shows gradle tasks in a special window
  • Shows dependencies listed in the gradle file
  • You can search for and add dependencies via Generate command
  • Going forward we will use gradle for our Java projects
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TDD

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TDD

  • Test Driven Development
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TDD

  • Test Driven Development
  • Write tests before implementing the story in working code
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TDD

  • Test Driven Development
  • Write tests before implementing the story in working code
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TDD Steps

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TDD Steps

  • Write no production code without a failing test.
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TDD Steps

  • Write no production code without a failing test.
  • Watch a new test fail before you try to make it pass.
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TDD Steps

  • Write no production code without a failing test.
  • Watch a new test fail before you try to make it pass.
  • Write easy code to make new tests pass.
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TDD Steps

  • Write no production code without a failing test.
  • Watch a new test fail before you try to make it pass.
  • Write easy code to make new tests pass.
  • Whenever all the tests pass, improve the design by removing duplication.
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TDD Steps

  • Write no production code without a failing test.
  • Watch a new test fail before you try to make it pass.
  • Write easy code to make new tests pass.
  • Whenever all the tests pass, improve the design by removing duplication.
  • 1) Red -> 2) Green -> 3) Refactor -> 4) Tests still pass
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Red Green Refactor

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Red Green Refactor

  • 1) Red -> 2) Green -> 3) Refactor -> 4) Tests still pass
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Red Green Refactor

  • 1) Red -> 2) Green -> 3) Refactor -> 4) Tests still pass
  1. Write failing tests (tests are red)
  2. Implement code to make tests pass (tests go green)
  3. Take more time to make the code better (refactor the code)
  4. Tests should still pass
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Why the need to refactor?

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Why the need to refactor?

  • You should solve the unit of work with as little and as simple code as possible
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Why the need to refactor?

  • You should solve the unit of work with as little and as simple code as possible
  • Once that passes, then refactor to make it faster, scalable, reliable, etc
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Why all this hassle?

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Why all this hassle?

You will have to think through your code before writing it

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Why all this hassle?

You will have to think through your code before writing it

  • What methods and classes will I need?
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Why all this hassle?

You will have to think through your code before writing it

  • What methods and classes will I need?
  • What parameters will be needed for your method(s)
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Why all this hassle?

You will have to think through your code before writing it

  • What methods and classes will I need?
  • What parameters will be needed for your method(s)
  • What will the method(s) return?
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Why all this hassle?

You will have to think through your code before writing it

  • What methods and classes will I need?
  • What parameters will be needed for your method(s)
  • What will the method(s) return?
  • What dependencies will be needed in your class(es)
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Why all this hassle?

You will have to think through your code before writing it

  • What methods and classes will I need?
  • What parameters will be needed for your method(s)
  • What will the method(s) return?
  • What dependencies will be needed in your class(es)
  • Could exceptions be thrown?
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Why all this hassle?

You will have to think through your code before writing it

  • What methods and classes will I need?
  • What parameters will be needed for your method(s)
  • What will the method(s) return?
  • What dependencies will be needed in your class(es)
  • Could exceptions be thrown?
  • Should exceptions be thrown?
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Test Lists

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Test Lists

  • Informal list of use cases and ways that the unit of code could be used
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Test Lists

  • Informal list of use cases and ways that the unit of code could be used
  • The test list is not saved, it's turned into actual working tests
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Test Lists

  • Informal list of use cases and ways that the unit of code could be used
  • The test list is not saved, it's turned into actual working tests
  • The list is a way for you to get the ideas out of your head, so you can focus on one case at a time
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TDD Benefits

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TDD Benefits

  • Clean, clearly defined code due to focus on discrete aspects
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TDD Benefits

  • Clean, clearly defined code due to focus on discrete aspects
  • Find design roadblocks earlier
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TDD Benefits

  • Clean, clearly defined code due to focus on discrete aspects
  • Find design roadblocks earlier
  • Already have confidence that your code “works”
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TDD Benefits

  • Clean, clearly defined code due to focus on discrete aspects
  • Find design roadblocks earlier
  • Already have confidence that your code “works”
  • Tests help define what your code is supposed to do
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TDD Benefits

  • Clean, clearly defined code due to focus on discrete aspects
  • Find design roadblocks earlier
  • Already have confidence that your code “works”
  • Tests help define what your code is supposed to do
  • Some believe if done right you will not need to use a debugger
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Instructor walk through

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Building Your Application

What does it take to build your Java application?

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