Getting Started

Download and install Java, if you need to.

Hello World

This will walk through compiling and running a "Hello world" example in Java.

Here's a simple Java "Hello world" program:

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

To compile this program, use the javac command:

$ javac HelloWorld.java

This will create a HelloWorld.class file, which is the Java executable.

To run a Java executable, use the java command, and pass it the executable's filename without the extension:

$ java HelloWorld
Hello, world!

awesome-java repo on github [1]

immutables in Java (similar notation to javascript/d3) [2]

libgdx for 3d games in Java [3]

stanford core NLP in java [4]

legion of the bouncy castle [5]

apache shiro for session management (large enterprise or small mobile) [6]

selenium web browser test suite [7]

jsoup crawler and html parser [8]

crawler4j another crawler and html parser [9]