Disabling Java via the command line in OS X is not easy. Disabling Java in OS X requires doing so for each user account; however, even terminal commands for doing this may be a bit impractical to. Alter the path to include the executable. This depends on the method java is launched. A)If java is run from the command line then add the directory of the executable to the PATH environment variable. B) If the java program is run from the Finder the path has to be altered in /MacOSX/environment.plist e.g. Adding /Users/mark/bin. After installing Java for macOS 2012-006, can I continue to use Apple's Java 6 alongside the macOS JDK for Java 13? If you want to continue to develop with Java 6 using command-line, then you can modify the startup script for your favorite command environment.
Java and the Mac OS X Terminal
This page is obsolete.
This document instructs you on how to use the Mac OS X Terminal with Java.
You will use the Java compiler javac to compile your Java programs andthe Java interpreter java to run them.To verify that Apple's implementation of Java 2 Standard Edition (Java SE 6) isalready installed:
- Run Software Update.
- Run Applications/Utilities/Java/Java Preferencesand verify that the Java SE 6 - 64-bit entry is checked andfirst in the list; if not, drag to change the preferred order.
You will type commands in an application called the Terminal.
- Open a terminal window. You can find this underGo -> Applications -> Utilities. Drag the Terminal to your dock sinceyou will be using it frequently.
- You should now have a Terminal window somewhere on the screen.It will have a prompt that looks something like:
- To check that you are running the right version of Java, typethe commands in boldface below. You should see something similar to the information printed below. The importantpart is that it says 1.6 or 1.5 (and not 1.4).
Then type
- Since you will be using the Terminal frequently, you may want tocustomize the default window settings (e.g., Monaco 13pt font with antialiasing).
- To check that you are running the right version of Java, typethe commands in boldface below. You should see something similar to the information printed below. The importantpart is that it says 1.6 or 1.5 (and not 1.4).
You will use the javac command to convert your Java program into a form moreamenable for execution on a computer.
- From the Terminal, navigate to the directory containing your .javafiles, say ~wayne/introcs/hello, by typing the cd commandbelow.
- Assuming the file, say HelloWorld.java is in the currentworking directory, type the javac command below to compile it.
If everything went well, you should see no error messages.
- Assuming the file, say HelloWorld.java is in the currentworking directory, type the javac command below to compile it.
You will use the java command to execute your program.
- From the Terminal, type the java command below.If all goes well, you should see the output of the program -Hello, World.
| Input and Output |
If your program gets stuck in an infinite loop, type Ctrl-c to break out.
If you are entering input from the keyboard, you can signifyto your program that there is no more data by typingCtrl-d for EOF (end of file).You should type this character on its own line.
Download Java Linux Command Line
When I try to run java I get: Exception in thread 'main' java.lang.NoClassDefFoundError.First, be sure that HelloWorld.class is in the current directory.Be sure to type java HelloWorld without a trailing .classor .java.If this was not your problem, it's possiblethat your CLASSPATH was set by some other program so that it no longerincludes the current working directory.Try running your program with the command line
If this works, your classpath is set incorrectly.Vpt 7 free download for mac. I get the error 'class file has wrong version 50.0, should be 49.0' when I compilefrom the Terminal. What does this mean?It's probably because DrJava is configured to use Java 6.0 and and your Terminal is configured to use Java 5.0.To change the default version of Java in your Terminal, launchJava Preferencest. Drag the Java SE 6 - 64-bit entryto appear first.
How do I get the menu to display at the topof the screen instead of at the top of the frame?Execute with java -Dapple.laf.useScreenMenuBar=true
Windows Java From Command Line
Where can I learn more about the command line?Here is a short tutorial on thecommand-line.