Java Magazine, Sept/Oct 2016

Figure 2 Console messages learn more ORACLE COM JAVAMAGAZINE SEPTEMBER OCTOBER 2016 23 internet of things Figure 2 is an example of the output shown in the console window of the IDE The console window displays all the messages I printed which makes it easy for me to understand what should happen with the components Conclusion This simple example demonstrates that you can take advantage of Java SE 8 to create high level code that interacts with IoT components on the Intel Galileo Gen 2 board The mraa and upm libraries are regularly updated and combining them with Java makes it easy to leverage your existing knowledge to undertake IoT projects that interact with different kinds of inputs outputs sensors displays and actuators article Gastón Hillar @ gastonhillar has been working as a software architect with Java since its first release He has 20 years of experience designing and developing software He is the author of many books related to software development hardware electronics and the Internet of Things Yocto Poky Linux image from the Yocto Project Intel System Studio IoT Edition User Guide for Java java proposals of interest FEATURED JDK ENHANCEMENT PROPOSAL JEP 293 Revising the Format of Command Line Options This recent enhancement proposal suggests that the JDK tools that are run from the command line should share a common syntax for passed in arguments As the document points out at present JDK tools dont share a common syntactical convention for switches For example the help command which most readers will agree should be consistent across all tools varies between help and help While JEP 293 primarily advocates uniformity in future command line JDK products it also suggests that a useful format to adopt would be the set of GNU syntax conventions described in large part in getopt 3 These conventions use a single hyphen for single letter options which can be combined and a double hyphen for the so called long options Although this choice is likely best because its familiar to many users and libraries exist that already parse its syntax it sufers from its own peculiarities W is reserved and conflicts at points with the POSIX syntax Of course this kind of dialogue is precisely the point of these JEPs to invite the community to share its views on potential changes to the JDK This proposal wisely doesnt advocate changing the options of existing tools so no compatibility breakage is envisioned Instead it recommends that new releases all support the agreed upon syntax and presumably that existing tools eventually add duplicate switches to attain conformity Listening for transport dt_ socket at address 8009 Red LED connected to PWM Pin 6 set to brightness level 0 Green LED connected to PWM Pin 5 set to brightness level 0 Blue LED connected to PWM Pin 3 set to brightness level 0 Measured light level Extremely dark Red LED connected to PWM Pin 6 set to brightness level 255 Green LED connected to PWM Pin 5 set to brightness level 255 Blue LED connected to PWM Pin 3 set to brightness level 255 Measured light level Extremely dark Red LED connected to PWM Pin 6 set to brightness level 128 Green LED connected to PWM Pin 5 set to brightness level 128 Blue LED connected to PWM Pin 3 set to brightness level 128