Hello World!

Printing "Hello World!" to the ev3dev device is what the easiest thing to deal with in Java.

                            package org.ev3dev.examples;
                            
                            public class HelloWorldDemo { //HelloWorldDemo Class
                            
                                public static void main(String[] args){ //Main method
                                    System.out.println("Hello World!"); //Print Hello World to System.out
                                }
                            	
                            }

Notice: LCD Graphics processing is quite slow on the EV3.

Besides of having "Hello World!" printed to the console, we can also write/draw it to the LCD.

                            package org.ev3dev.examples;
                            
                            //Import necessary classes
                            import org.ev3dev.hardware.lcd.LCD;
                            import org.ev3dev.hardware.lcd.LCDGraphics;
                            
                            public class HelloWorldLCDDemo { //HelloWorldLCDDemo Class
                            
                                public static void main(String[] args){ //Main method
                                    LCD lcd = new LCD(); //Creates an ev3dev LCD instance
                                    
                                    LCDGraphics g = new LCDGraphics(lcd); //Creates a LCDGraphics instance, which has the same functionality of a Graphics2D class
									
                                    g.drawString("Hello World!", 50, 50); //Draws Hello World, takes some time on the EV3
									
                                    g.flush(); //Renders the image and flush to the LCD, takes some time on the EV3
                                }
                            	
                            }

That's easy right? Let's go deeper about the motors.