Java Hello World Example: How To Write and Execute Java.
In order to run other peoples' Java programs, you must have the JRE (Java Runtime Environment). In order to write and run your own Java programs, you must have the JDK (Java Development Kit), which is sometimes called the SDK (System Development Kit)--these are the same thing.
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Java API (Application Programming Interface): Set of classes’ written using Java programming language which runs on JVM. These classes will help programmers by providing standard methods like reading from the console, writing to the console, saving objects in data structure etc.
Writing Java applets and applications needs development tools like JDK. The JDK includes the Java Runtime Environment, the Java compiler and the Java APIs. It's easy for both new and experienced programmers to get started.
Assignment: Write a complete, well-documented Java program that begins by asking the user to enter the grams of fat and the calories in a serving of a food product. The program will compute the percentage of the food's calories that are due to fat, and will display the input information and the percentage in the form of a complete English sentence.
If you downloaded the JDK with the NetBeans IDE, start NetBeans, and begin programming. You can also program using a simple text editor, and compile and run from the command line. Many text editors now come with the ability to run and compile Java files, but you may need to tell the program where javac.exe and java.exe reside on your computer.
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