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Create Java console app

Install Java, Gradle on WSL2 (Ubuntu) and VS Code extensions

  • You can skip this section if you have already setup Java development environment.
  • Follow this document to install Java, Gradle build tool and VS Code extensions.

Create a new Java console app with Gradle

  • Open a terminal and execute the following commands to reate a project folder:
    Terminal window
      mkdir demo
      cd demo
  • Init Java project with Gradle
Terminal window
  gradle init
  • Then select the following options and press enter to create a new Java application project.
    Terminal window
      Select type of project to generate:
        1: basic
        2: application
        3: library
        4: Gradle plugin
      Enter selection (default: basic) [1..4] 2
    

      Select implementation language:
        1: C++
        2: Groovy
        3: Java
        4: Kotlin
        5: Scala
        6: Swift
      Enter selection (default: Java) [1..6] 3
    

      Split functionality across multiple subprojects?:
        1: no - only one application project
        2: yes - application and library projects
      Enter selection (default: no - only one application project) [1..2] 1
    

      Select build script DSL:
        1: Groovy
        2: Kotlin
      Enter selection (default: Groovy) [1..2] 1
    

      Generate build using new APIs and behavior (some features may change in the next minor release)? (default: no) [yes, no]
    

      Select test framework:
        1: JUnit 4
        2: TestNG
        3: Spock
        4: JUnit Jupiter
      Enter selection (default: JUnit Jupiter) [1..4] 3
    

      Project name (default: demo):
      Source package (default: demo):
  • The init task generates the project with the following structure:
    Terminal window
      tree .
      ├── app
      │   ├── build.gradle
      │   └── src
      │       ├── main
      │       │   ├── java
      │       │   │   └── demo
      │       │   │       └── App.java
      │       │   └── resources
      │       └── test
      │           ├── groovy
      │           │   └── demo
      │           │       └── AppTest.groovy
      │           └── resources
      ├── gradle
      │   └── wrapper
      │       ├── gradle-wrapper.jar
      │       └── gradle-wrapper.properties
      ├── gradlew
      ├── gradlew.bat
      └── settings.gradle

Run Java console app

  • Execute the following comand to run the console app 
      ./gradlew run
  • You will find Hello World! message in a terminal as following:
    Terminal window
      > Task :app:run
      Hello World!
    

      BUILD SUCCESSFUL
      2 actionable tasks: 2 executed

Run a unit test case

  • Execute the following comand to run a unit test case
    Terminal window
      ./gradlew test

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