gradle init
Starting a Gradle Daemon (subsequent builds will be faster)

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

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

Project name (default: gradle-test):
Source package (default: gradle.test):

> Task :init
Get more help with your project: https://docs.gradle.org/6.7/samples/sample_building_java_applications.html

BUILD SUCCESSFUL in 45s
2 actionable tasks: 2 executed

按照你的需要，经过一系列的选择之后，就可以生成一个基本的gradle项目了。

我们看下生成的文件和目录：

.
├── app
│   ├── build.gradle
│   └── src
│       ├── main
│       │   ├── java
│       │   │   └── gradle
│       │   │       └── test
│       │   │           └── App.java
│       │   └── resources
│       └── test
│           ├── java
│           │   └── gradle
│           │       └── test
│           │           └── AppTest.java
│           └── resources
├── gradle
│   └── wrapper
│       ├── gradle-wrapper.jar
│       └── gradle-wrapper.properties
├── gradlew
├── gradlew.bat
└── settings.gradle

14 directories, 8 files

rootProject.name = 'gradle-test'
include('app')

plugins {
    // Apply the application plugin to add support for building a CLI application in Java.
    id 'application'
}

repositories {
    // Use JCenter for resolving dependencies.
    jcenter()
}

dependencies {
    // Use JUnit test framework.
    testImplementation 'junit:junit:4.13'

    // This dependency is used by the application.
    implementation 'com.google.guava:guava:29.0-jre'
}

application {
    // Define the main class for the application.
    mainClass = 'gradle.test.App'
}

gradle run

> Configure project :app
Repository ${repo.url} replaced by $REPOSITORY_URL .

> Task :app:run
Hello World!

gradle build

> Configure project :app
Repository ${repo.url} replaced by $REPOSITORY_URL .

BUILD SUCCESSFUL in 2s
7 actionable tasks: 6 executed, 1 up-to-date

./gradlew build --scan

BUILD SUCCESSFUL in 0s
7 actionable tasks: 7 executed

Publishing a build scan to scans.gradle.com requires accepting the Gradle Terms of Service defined at https://gradle.com/terms-of-service.
Do you accept these terms? [yes, no] yes

Gradle Terms of Service accepted.

Publishing build scan...
https://gradle.com/s/5u4w3gxeurtd2

task hello {
    doLast {
        println 'Hello www.flydean.com!'
    }
}

gradle -q hello
Hello www.flydean.com!

task upper {
    doLast {
        String someString = 'www.flydean.com'
        println "Original: $someString"
        println "Upper case: ${someString.toUpperCase()}"
    }
}

> gradle -q upper
Original: www.flydean.com
Upper case: WWW.FLYDEAN.COM

task count {
    doLast {
        4.times { print "$it " }
    }
}

> gradle -q count
0 1 2 3

task hello {
    doLast {
        println 'Hello www.flydean.com!'
    }
}
task intro {
    dependsOn hello
    doLast {
        println "I'm flydean"
    }
}

4.times { counter ->
    task "task$counter" {
        doLast {
            println "I'm task number $counter"
        }
    }
}

> gradle -q task1
I'm task number 1

4.times { counter ->
    task "task$counter" {
        doLast {
            println "I'm task number $counter"
        }
    }
}
task0.dependsOn task2, task3

> gradle -q task0
I'm task number 2
I'm task number 3
I'm task number 0

task myTask {
    ext.myProperty = "www.flydean.com"
}

task printTaskProperties {
    doLast {
        println myTask.myProperty
    }
}

defaultTasks 'clean', 'run'

task clean {
    doLast {
        println 'Default Cleaning!'
    }
}

task run {
    doLast {
        println 'Default Running!'
    }
}

task other {
    doLast {
        println "I'm not a default task!"
    }
}

import org.apache.commons.codec.binary.Base64

buildscript {
    repositories {
        mavenCentral()
    }
    dependencies {
        classpath group: 'commons-codec', name: 'commons-codec', version: '1.2'
    }
}

task encode {
    doLast {
        def byte[] encodedString = new Base64().encode('hello world\n'.getBytes())
        println new String(encodedString)
    }
}