Get Gradle

 brew install gradle

Create Project directory “MarsRover”

mkdir MarsRover 

Build Project Structure:

cd MarsRover/ mkdir -p src/main/java mkdir -p src/test/java

Create first java class:

cd src/main/java vi HelloWorld.java

public class HelloWorld{ 
    public static void main(String[] args){ 
        System.out.println(“Hello World!!”);
        }
    }

Java conventional rules: Allowed only one public class in the file and that class name should match the filename. ‘static’ means method is not an instance it is attached to the class ‘void’ means method is not returning anything main mean its the entry point to the app

Build your project:

gradle build

:compileJava UP-TO-DATE (compiles java classes – HelloWorld) :processResources UP-TO-DATE 
:classes UP-TO-DATE (classes depends on compileJava) 
:jar UP-TO-DATE (Builds the jar – creates MarsRover.jar with HelloWorld – .zip) 
:assemble UP-TO-DATE umbrella tasks 
:compileTestJava UP-TO-DATE 
:processTestResources UP-TO-DATE 
:testClasses UP-TO-DATE 
:test UP-TO-DATE 
:check UP-TO-DATE (umbrella for test tasks … i.e. cucumber) 
:build UP-TO-DATE (umbrella: assemble and check)

This basically creates a .jar file (MarsRover.jar) which is really just a zip file of all your compiled source files. (everything from src/main/java)

Running program:

cd build/libs/ java -cp MarsRover.jar HelloWorld