Hello World

hello_world.py

def print_hello_world():
    print "Hello world!"

print_hello_world()

HelloWorld.java

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

HelloWorld.js

function printHelloWorld()
{
   document.write("Hello world!");
}

printHelloWorld();