Javanotes 7. 0, Section 2. Programming Environments. Section 2. 6. Although the Java language is highly. Java programs. vary widely from one programming environment to another. There are two. basic approaches a command line environment. Netbeans Editor Library 2' title='Netbeans Editor Library 2' />Alice is used to teach students how to code. IDE. where the user uses the keyboard and mouse to interact with a graphical user. While there is just one common command line environment for Java. IDEs, including Eclipse, Net. Beans. and Blue. J. I cannot give complete or definitive information on Java programming environments. I will try to give enough information to let you compile. Readers are strongly encouraged to read. Source code can be downloaded from the. One thing to keep in mind is that you do not have to pay any money. Java programming aside from buying a computer, of course. Everything. that you need can be downloaded for free on the Internet. The basic development system for Java programming is usually referred. JDK Java Development Kit. It is a part of Java SE. Java Standard Edition as opposed to Java EE for servers or Java ME for mobile devices. Note that Java SE comes in. Development Kit version the JDK and a Runtime Environment version. JRE. The. Runtime can be used to run Java programs. Java programs. The Development Kit includes the Runtime but also. You need a JDK for use with this textbook. Java was developed by Sun Microsystems, Inc., which is now a part of the Oracle corporation. Oracle makes the JDK for Windows, Mac OS, and Linux. Java Web site. Many Windows computers come with. Java Runtime already installed, but you might need to install the JDK. Some versions of Linux come with the JDK either installed by default or. Mac OS does not currently come with Java pre installed. If you need to download and install the JDK, be sure to get the JDK for Java 7, Java 8, or later. CXISy9ML6o/T8WGM8A7ZVI/AAAAAAAAD5c/KWc8TPfyEgk/s640/Workspace+1_193.png' alt='Netbeans Editor Library 2' title='Netbeans Editor Library 2' />As of summer, 2. If a JDK is properly installed on your computer, you can use the command line environment. Java programs. An IDE will also require a JDK, but it might be included with. IDE download. Many modern computer users find the command line environment to be. R9M5l.png' alt='Netbeans Editor Library 2' title='Netbeans Editor Library 2' />Java TM SE Development Kit 8 Update 151 and NetBeans TM IDE 8. Java SE Software Bundle Installation Instructions. The following instructions describe how to install. Neuroph is lightweight and flexible Java neural network framework which supports common neural network architectures and learning rules. It is certainly very different from the. However, it. takes only a little practice to learn the basics of the command line. To use a command line programming environment, you will have to open a window. In Windows, you can open such a command window. In Windows 7. click Start Program Files Accessories Command Prompt. In Windows 8. Windows and X keys together to bring up the Power User Menu,. Command Prompt. In Mac OS, you want to run the. Terminal program, which can be found in. Utilities folder inside the Applications folder. In Linux, there. are several possibilities, including an old program called xterm. Terminal in your applications menu. No matter what type of computer you are using, when you open a command window. Type in a command at the prompt and. The computer will carry out the command, displaying any. One of the central concepts in the command line. The. words directory and folder mean the same thing. Often, the. You. can get a list of the files in the current directory by typing in the. Windows or. ls on Linux and Mac OS. When the window. first opens, the current directory is your home directory. You can change the current directory using. For example, to change into your. Desktop directory, type in the command cd Desktop and. You should create a directory that is, a folder to hold your Java work. For example. create a directory named javawork in your home directory. You can do this using. GUI another way to do it is to open a command. When you want to work on programming, open a command window and use. Of course, you can have more than one working directory for your Java work. The most basic commands for using Java on the command line are. Java source code, and java. Java stand alone applications. If. a JDK is correctly installed on your computer, it should recognize these. Try typing the commands. Java is installed. If you get a message. Command not found, then Java is not correctly installed. If the. java command works, but javac does not, it means that a Java Runtime. Development Kit. On Windows, after installing. JDK, you need to modify the Windows PATH environment variable to make this work. See the JDK installation instructions on Oracles download site for information about how to do this. To test the javac command, place a copy of Text. IO. java. into your working directory. If you downloaded the Web site of this book. GUI to copy and paste this file into your working directory. Alternatively, you can navigate to Text. IO. java on the. books Web site and use the. Long Beach Youth Softball League. Save As command in your Web browser to save a copy of the file into your working directory. Type the command javac Text. IO. java. This will compile Text. IO. java and will create a bytecode file. Text. IO. class in the same directory. Note that if the command. To test the java command, copy a sample program such as Interest. First, compile the program. Interest. 2. java. Remember that for this to succeed, Text. IO must already be in. Then you can execute the program using the commandjava Interest. Be careful to use just the name of the program, Interest. Java source code file. When you give this command, the program will run. You will be asked to enter some. When the program ends, you will see the. Note that java Text. IO. would not make sense, since Text. IO does not have a main routine. You can follow a similar procedure to run all of the examples in this book. Some examples. require additional classes, such as Text. IO, in addition to the main program. Remember to. place any required classes in the same folder as the program that uses them. You can use either. To create your own programs, you will need a text editor. A text editor is a computer program that allows you to create and save documents. It is important that the documents be saved as plain text. Word processor. documents are not appropriate, unless you can get your word processor to save. A good text editor can make programming a lot more pleasant. Linux comes with several text editors. On Windows, you can use notepad in a pinch. For Mac OS, you might download. Text. Wrangler application. One. possibility that will work on any platform is to use jedit. Java and that can be downloaded. To work on your programs, you can open a command line window and cd. Start up. your text editor program, such as by double clicking its icon or selecting it from. Start menu. Type your code into the editor window, or open an existing source code. Save the file into your working directory. Remember that the name of a Java. Once the file is saved in your working directory. If there are syntax errors in the code, they will be listed. Each error message contains the line number in the file. Go back to the editor and try to fix one or more. Its usually a good idea to just work on the first few errors sometimes fixing. Remember that when the javac command finally succeeds, you will get. Then you can use the java command to run your. Once youve compiled the program, you can run it as. Thats really all there is to it Keep both editor and command line window open. Edit, save, and compile until you have eliminated all the syntax errors. Always. remember to save the file before compiling it the compiler only sees the saved. When you run the program, you might. In that case. you have to go back to the editsavecompile loop to try to find and fix the problem. In an Integrated Development Environment, everything you need to create, compile, and.