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1. Download and install Java Development KitIn order to write and run a Java program, you need to install a software program called Java SE Development Kit (or JDK for short, and SE means Standard Edition). Basically, a JDK contains:
java -version javac -version How to get rid of mac cleaner virus. 2. Set up environment variablesNow we’re going to set environment variables so that the javac.exeprogram can be accessed anywhere from command line. On Windows 7, go to My Computer and click System Properties:Then click Advanced system settings:The System Properties dialog appears, select Advanced tab and click Environment Variables.:The Environment Variable dialog appears, click on the New… button under the System variables section.That opens up the New System Variable dialog. Type the following information:The field Variable name must be JAVA_HOME, and the field Variable value must point to JDK’s installation directory on your computer. Here it is set to c:Program FilesJavajdk1.7.0_21. Click OK to close this dialog.Now back to the Environment Variables dialog, look for a variable called Path under the System Variables list, and click Edit…:In the Edit System Variable dialog, append the following to the end of the field Variable value:;%JAVA_HOME%binNote that there is a semicolon at the beginning to separate this value from other ones. Click OK three times to close all the dialogs.Now we have to quit the current command prompt and open a new one to see the changes takes effect. Type the following command again in the re-opened command prompt window: javac -version Broadcom airport extreme drivers for mac. How to use an app on your mac. ![]() 3. Code a Java hello world programOpen a simple text editor program such as Notepad and type the following content:Save the file as HelloWorld.java (note that the extension is .java) under a directory, let’s say, C:Java.Don’t worry if you don’t understand everything in this simple Java code. The following picture explains it nicely:Every Java program starts from the main()method. This program simply prints “Hello world” to screen.4. Compile your first Java programNow let’s compile our first program in the HelloWorld.java file using javac tool. Type the following command to change the current directory to the one where the source file is stored:Sony xdcam driver mac download. Lil webbie savage life 1 mp3 download. Avg mac download. cd C:JavaAnd type the following command: javac HelloWorld.javaThat invokes the Java compiler to compile code in the HelloWorld.java file into bytecode. Note that the file name ends with .java extension. You would see the following output:If everything is fine (e.g. no error), the Java compiler quits silently, no fuss. After compiling, it generates the HelloWorld.class file which is bytecode form of the HelloWorld.java file. Now try to type dir in the command line, we’ll see the .class file:So remember a Java program will be compiled into bytecode form (.class file). 5. Run your first Java programIt’s now ready to run our first Java program. Type the following command:java HelloWorld Mac hard drive cleaner free.That invokes the Java Virtual Machine to run the program called HelloWorld (note that there is no .java or .class extension). You would see the following output:It just prints out “Hello world!” to the screen and quits. Congratulations! You have successfully run your first Java program! 6. What we have learnt so farThroughout this tutorial you have learnt the following things:
Related Java Hello World Tutorials:About the Author:Nam Ha Minh is certified Java programmer (SCJP and SCWCD). He started programming with Java in the time of Java 1.4 and has been falling in love with Java since then. Make friend with him on Facebook.Compile Java Code Into Dmg Windows 7Add commentComments are closed.
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