How to Run Java Applications using the Windows Command Prompt. Julian Falasca May 11th, 2010 ENGL 393 Introduction • Purpose: Most IS courses don’t touch this topic. • Target Audience: Students already familiar with Java programming. (CMSC and IS majors) • When to Use: On the job. • Safety Information: Don’t get too excited. Materials Needed • At least 1 valid java source file. (HelloWorld.java) – Must know where this file is located. • Java Development Kit (JDK) already installed. – http://java.sun.com/javase/downloads/index.jsp Step 1 • Click on Start, Programs, Accessories, and select Command Prompt. Example Command Prompt Step 2 • This example uses a java file which is located: D:\Workspace\HelloWorld.java • Type d: and press enter. – This command changes directories to the D drive. Example Command Prompt Step 3 • Type cd Workspace and press enter. – This takes you into the Workspace directory. Example Command Prompt Step 4 • Type dir and press enter. • This displays a list of files in the current directory. – Confirm that HelloWorld.java is in the list. Example Command Prompt Step 5 • Type javac HelloWorld.java and press enter. – This compiles the file, allowing you to run it. • A new file has been created named HelloWorld.class. Example Command Prompt Step 6 • Type java HelloWorld and press enter. – The Java application will run. Example Command Prompt Conclusion • Warranty Information: N/A • Technical Support: Lookup commands on google. • FAQs: – Why do I get the error “javac command not recognized”? • Most likely you have not installed the JDK correctly. – How do I go to the previous directory? • Type cd .. and press enter. Conclusion Continued Problem Cause Solution When compiling you get You typed javac HelloWorld You must include the file the following error: Class extension when compiling. names, ‘HelloWorld’, are Type javac HelloWorld.java only accepted if annotation processing is explicitly requested. When running the You typed java You cannot include the application you get the HelloWorld.class extension when running. following error: Exception Type java HelloWorld in thread “main” java.lang.NoClassDefFound Error: HellowWorld/class Questions?
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