Java ☕

learning java

Standard directory layout (for java-maven project)

Directory	Description
`src`	Source material for building the project
`src/main`	Main build artifact
`src/main/java`	Application/Library sources (below this, the normal package hierarchy exists)
`src/main/resources`	Application/Library resources
`src/main/filters`	Resource filter files
`src/main/webapp`	Web application sources
`src/test`	Unit test code
`src/test/java`	Test sources
`src/test/resources`	Test resources
`src/test/filters`	Test resource filter files
`src/it`	Integration Tests (primarily for plugins)
`src/assembly`	Assembly descriptors
`target`	Build output's destination

🔗 Ref

Root directory src/main/java, post this package/subpackage/.../className.java

For example, src/main/java/com/basics/Basics.java

package com.basics;

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

To compile,

javac package/subpackage/className.java

and to run,

java package.subpackage.className

For example, to run above stated src/main/java/com/basics/Basics.java

javac src/main/java/com/basics/Basics.java
cd src/main/java && java com.basics.Basics

Above processes are packed in run.sh, to compile and run

sh run.sh com.basics Basics

To build,

mvn package -f <pom_file>

and to run,

java -jar target/<artifactId>-<version>.jar

Above variables retrieved from pom.xml: project.artifactId & project.version