Welcome!

Java IoT Authors: Yeshim Deniz, Pat Romanski, Liz McMillan, Elizabeth White, Frank Lupo

Related Topics: Java IoT, Machine Learning

Java IoT: Article

Learn Java in 10 Minutes

Basic Java Tutorial

What is Java?
You can find tons of definition about Java on web; my answer is simple “Programming Language to develop any kind of application with Object Oriented approach and it can run anywhere”.

Sample application
For example, you need to develop an application to track your daily expenses on your PC. The application can be developed by Java by the following manner.

Minute 1 Session
First download and install Java Development Kit (JDK) from official Oracle site. The JDK is the software environment where you can compile and run your Java programs.  Download here.

Minute 2 Session
Know the commands to compile and run a Java program.  Before that you need to set the path to point your Java compiler on your development location. Assume that you have installed JDK on your C:\Program Files\Java\jdk1.7.0 drive. You need to run the following line of code in your command prompt before accessing Java compiler.
SET PATH = C:\Program Files\Java\jdk1.7.0\bin;
Open start menu and type cmd on your Windows machine to open command window.  Now open your folder where your Java programs are saved.

For example: D:/MyJava.
Cd  D:/MyJava
D:MyJava > SET PATH = C:\Program Files\Java\jdk1.7.0\bin;


Note that “jdk1.7.0\bin” folder contains Java compiler (javac) and Java interpreter (java) applications.
Now you are ready to run a sample Java program on your machine. Unlike like regular hello world application, we are going to run a practical program to track daily expenses.

Minute 3 Session
Just learn about simple Java program and know the basic steps to compile and run a program.
A Java class is a blueprint of an object. An object in an instance of a class.

Step1: Identify Java classes
Step2: Develop Java classes
Step3: Develop main class
Step4: Compile all classes
Step5: Run main class

Main class is a Java class which has interpreter calling method named main like below:

public void main(String args[]){ // main method to run a Java program
// Code to call other objects/classes
}


Minute 4 Session
In our case, we need to develop an application for daily expense tracking. The following classes may satisfy these requirements.
ExpenseTracker
ExpenseTrackerMain


Minute 5 Session
Develop ExpenseTracker Java class.

public class ExpenseTracker {

public void addExpense(String expenditure, double amount){
System.out.print(“Expenditure ”+ expenditure+”  “+amount+” added on ”+new java.util.Date());
}

}


Save this file as ExpenseTracker.java in your working folder.


Minute 6 Session
Develop ExpenseTrackerMain class to run this application.

public class ExpenseTrackerMain {

public static void main(String as[]){
ExpenseTracker tracker = new ExpenseTracker();
String expen = JOptionPane.showInputDialog(null, “Expenditure”);
String amount = JOptionPane.showInputDialog(null, “Amount”);
Double doubleAmount = Double.parseDouble(amount);
tracker.addExpense(expen, doubleAmount);
}

}

Minute 7 Session
Compile your application.  Just open your working directory where you saved these .java files and follow the below steps.
Open command prompt and go to your working directory.

Type SET PATH = C:\Program Files\Java\jdk1.7.0\bin; // recall Minute 2 session
Type javac *.java
This command will compile both ExpenseTracker and ExpenseTrackerMain Java files. This action will generate .class files inside your working directory.

Minute 8 Session
Run your application.
Open command prompt and go to your working directory.
Just type java ExpenseTrackerMain in your command window.

Minute 9 Session
Your first Java program is done.
What is next?
Just add some methods in ExpenseTracker Java file, call those methods in ExpenseTrackerMain class, compile and run again.

Minute 10 Session
Similar to Expense Tracker application develop Task Tracker application by using the following code snippet.

public void addTask(String task, Status status){
System.out.print(“Task ”+ task +”   added on ”+new java.util.Date()+”.  Status of this task is :”+status);
}


What is next?
One of the best ways to develop your Java knowledge is by Oracle’s Java Certification program. There are numerous vendors available to teach Java in the world but there are few vendors are having good knowledge and latest updates.

You can find best Java Certification Training Labs from EPractize Labs,  leading Java Certification Preparation website for all Oracle’s certifications including latest Java 7 and Java EE 6 OCE certifications.

The following Training Labs teach beginner to expert level in Java 7 programming.
1Z0-803 - Oracle Certified Associate, Java SE 7 Programmer  -  Java SE 7 OCA Training Lab
1Z1-804 - Oracle Certified Professional, Java SE 7 Programmer - Java EE 7 OCP Online Training

More Stories By Kenrick Freemen

Kenrick Freemen is a software architect doing consulting for banking and education domains. He has more than 6 years of experience in developing Java EE applications. He is a Sun Certified Java Programmer, Oracle Certified Professional, Java EE 5 Web Services Developer and Sun Certified Java EE Architect.

@ThingsExpo Stories
High-velocity engineering teams are applying not only continuous delivery processes, but also lessons in experimentation from established leaders like Amazon, Netflix, and Facebook. These companies have made experimentation a foundation for their release processes, allowing them to try out major feature releases and redesigns within smaller groups before making them broadly available. In his session at 21st Cloud Expo, Brian Lucas, Senior Staff Engineer at Optimizely, will discuss how by using...
In this strange new world where more and more power is drawn from business technology, companies are effectively straddling two paths on the road to innovation and transformation into digital enterprises. The first path is the heritage trail – with “legacy” technology forming the background. Here, extant technologies are transformed by core IT teams to provide more API-driven approaches. Legacy systems can restrict companies that are transitioning into digital enterprises. To truly become a lead...
SYS-CON Events announced today that CAST Software will exhibit at SYS-CON's 21st International Cloud Expo®, which will take place on Oct 31 - Nov 2, 2017, at the Santa Clara Convention Center in Santa Clara, CA. CAST was founded more than 25 years ago to make the invisible visible. Built around the idea that even the best analytics on the market still leave blind spots for technical teams looking to deliver better software and prevent outages, CAST provides the software intelligence that matter ...
SYS-CON Events announced today that Daiya Industry will exhibit at the Japanese Pavilion at SYS-CON's 21st International Cloud Expo®, which will take place on Oct 31 – Nov 2, 2017, at the Santa Clara Convention Center in Santa Clara, CA. Ruby Development Inc. builds new services in short period of time and provides a continuous support of those services based on Ruby on Rails. For more information, please visit https://github.com/RubyDevInc.
As businesses evolve, they need technology that is simple to help them succeed today and flexible enough to help them build for tomorrow. Chrome is fit for the workplace of the future — providing a secure, consistent user experience across a range of devices that can be used anywhere. In her session at 21st Cloud Expo, Vidya Nagarajan, a Senior Product Manager at Google, will take a look at various options as to how ChromeOS can be leveraged to interact with people on the devices, and formats th...
SYS-CON Events announced today that Yuasa System will exhibit at the Japan External Trade Organization (JETRO) Pavilion at SYS-CON's 21st International Cloud Expo®, which will take place on Oct 31 – Nov 2, 2017, at the Santa Clara Convention Center in Santa Clara, CA. Yuasa System is introducing a multi-purpose endurance testing system for flexible displays, OLED devices, flexible substrates, flat cables, and films in smartphones, wearables, automobiles, and healthcare.
SYS-CON Events announced today that Taica will exhibit at the Japan External Trade Organization (JETRO) Pavilion at SYS-CON's 21st International Cloud Expo®, which will take place on Oct 31 – Nov 2, 2017, at the Santa Clara Convention Center in Santa Clara, CA. Taica manufacturers Alpha-GEL brand silicone components and materials, which maintain outstanding performance over a wide temperature range -40C to +200C. For more information, visit http://www.taica.co.jp/english/.
Enterprises have taken advantage of IoT to achieve important revenue and cost advantages. What is less apparent is how incumbent enterprises operating at scale have, following success with IoT, built analytic, operations management and software development capabilities – ranging from autonomous vehicles to manageable robotics installations. They have embraced these capabilities as if they were Silicon Valley startups. As a result, many firms employ new business models that place enormous impor...
SYS-CON Events announced today that SourceForge has been named “Media Sponsor” of SYS-CON's 21st International Cloud Expo, which will take place on Oct 31 – Nov 2, 2017, at the Santa Clara Convention Center in Santa Clara, CA. SourceForge is the largest, most trusted destination for Open Source Software development, collaboration, discovery and download on the web serving over 32 million viewers, 150 million downloads and over 460,000 active development projects each and every month.
SYS-CON Events announced today that Dasher Technologies will exhibit at SYS-CON's 21st International Cloud Expo®, which will take place on Oct 31 - Nov 2, 2017, at the Santa Clara Convention Center in Santa Clara, CA. Dasher Technologies, Inc. ® is a premier IT solution provider that delivers expert technical resources along with trusted account executives to architect and deliver complete IT solutions and services to help our clients execute their goals, plans and objectives. Since 1999, we'v...
As popularity of the smart home is growing and continues to go mainstream, technological factors play a greater role. The IoT protocol houses the interoperability battery consumption, security, and configuration of a smart home device, and it can be difficult for companies to choose the right kind for their product. For both DIY and professionally installed smart homes, developers need to consider each of these elements for their product to be successful in the market and current smart homes.
SYS-CON Events announced today that MIRAI Inc. will exhibit at the Japan External Trade Organization (JETRO) Pavilion at SYS-CON's 21st International Cloud Expo®, which will take place on Oct 31 – Nov 2, 2017, at the Santa Clara Convention Center in Santa Clara, CA. MIRAI Inc. are IT consultants from the public sector whose mission is to solve social issues by technology and innovation and to create a meaningful future for people.
SYS-CON Events announced today that Massive Networks, that helps your business operate seamlessly with fast, reliable, and secure internet and network solutions, has been named "Exhibitor" of SYS-CON's 21st International Cloud Expo ®, which will take place on Oct 31 - Nov 2, 2017, at the Santa Clara Convention Center in Santa Clara, CA. As a premier telecommunications provider, Massive Networks is headquartered out of Louisville, Colorado. With years of experience under their belt, their team of...
SYS-CON Events announced today that TidalScale, a leading provider of systems and services, will exhibit at SYS-CON's 21st International Cloud Expo®, which will take place on Oct 31 - Nov 2, 2017, at the Santa Clara Convention Center in Santa Clara, CA. TidalScale has been involved in shaping the computing landscape. They've designed, developed and deployed some of the most important and successful systems and services in the history of the computing industry - internet, Ethernet, operating s...
Widespread fragmentation is stalling the growth of the IIoT and making it difficult for partners to work together. The number of software platforms, apps, hardware and connectivity standards is creating paralysis among businesses that are afraid of being locked into a solution. EdgeX Foundry is unifying the community around a common IoT edge framework and an ecosystem of interoperable components.
Coca-Cola’s Google powered digital signage system lays the groundwork for a more valuable connection between Coke and its customers. Digital signs pair software with high-resolution displays so that a message can be changed instantly based on what the operator wants to communicate or sell. In their Day 3 Keynote at 21st Cloud Expo, Greg Chambers, Global Group Director, Digital Innovation, Coca-Cola, and Vidya Nagarajan, a Senior Product Manager at Google, will discuss how from store operations...
In a recent survey, Sumo Logic surveyed 1,500 customers who employ cloud services such as Amazon Web Services (AWS), Microsoft Azure, and Google Cloud Platform (GCP). According to the survey, a quarter of the respondents have already deployed Docker containers and nearly as many (23 percent) are employing the AWS Lambda serverless computing framework. It’s clear: serverless is here to stay. The adoption does come with some needed changes, within both application development and operations. Tha...
SYS-CON Events announced today that IBM has been named “Diamond Sponsor” of SYS-CON's 21st Cloud Expo, which will take place on October 31 through November 2nd 2017 at the Santa Clara Convention Center in Santa Clara, California.
In his Opening Keynote at 21st Cloud Expo, John Considine, General Manager of IBM Cloud Infrastructure, will lead you through the exciting evolution of the cloud. He'll look at this major disruption from the perspective of technology, business models, and what this means for enterprises of all sizes. John Considine is General Manager of Cloud Infrastructure Services at IBM. In that role he is responsible for leading IBM’s public cloud infrastructure including strategy, development, and offering ...
Infoblox delivers Actionable Network Intelligence to enterprise, government, and service provider customers around the world. They are the industry leader in DNS, DHCP, and IP address management, the category known as DDI. We empower thousands of organizations to control and secure their networks from the core-enabling them to increase efficiency and visibility, improve customer service, and meet compliance requirements.