The classpath is the file path that the Java runtime environment searches for classes and other resource files. It can be set using either the -classpath option when executing a program or by setting the system CLASSPATH environment variable. As the name suggests, it's simply a file path where the.class files can be found in a JDK package. Paths created by other providers are unlikely to be interoperable with the abstract path names represented by java.io.File. The toPath method may be used to obtain a Path from the abstract path name represented by a java.io.File object. The resulting Path can be used to operate on the same file as the java.io.File object.

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This page is obsolete.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.

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.

Command-line interface

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).

Compile the program

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See full list on en.wikipedia.org. 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.

Execute the program

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.

Troubleshooting

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

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If this works, your classpath is set incorrectly.

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

Where can I learn more about the command line?Here is a short tutorial on thecommand-line.

The shell path for a user in macOS is a set of paths in the filing system whereby the user has permissions to use certain applications, commands and programs without the need to specify the full path to that command or program in the Terminal.

So instead of running something like this, with a path to the command or script:

You can just type the command, regardless of where you are in the filing system:

Your shell path is a bunch of absolute paths of the filing system separated by colons :

You can find out whats in your path by launching Terminal in Applications/Utilities and entering:

And the result should be like this.(the last one when you have Xcode)

So this is stating that you can run Unix style applications or commands located in 5 or 6 default locations of a certain path in the filing system:

/usr/local/bin
/usr/bin
/bin
/usr/sbin
/sbin
/Library/Apple/usr/bin (If you have Xcode)

These directories are not visible by default in the filing system but you can make them visible.

Adding a Temporary Location

You can add extra locations to your path, in the myscript.sh example above it’s location /Users/yourusername/bin/ which is not in the default path, you can add it in Terminal like so:

So here I have copied my existing path and added the new location on the end, colon separate the paths. Test it by running echo $PATH again in the Terminal.

One of the disadvantages of this is that the new location will only be honored for that particular Terminal session, when a new Terminal window is launched it will have the original default path again.

Adding in a Permanent Location

To make the new pathstick permanently you need to add or edit a .zshrc file in your home directory and add to the path there.

This configuration file controls various Terminal environment preferences including the path.

In macOS Big Sur and Catalina the default shell is Zsh aka the Z Shell (previously it was the Bash Shell).

This command moves you into home directory, if you are already in the home directory then you are in the right spot. Check you have a .zshrc file by running the ls -la command which shows the directory files.

If you don’t have it, create it and edit it with a command line editor called nano:

If you do have it just edit it:

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