Java and the Mac OS X Terminal Java and the Mac OS X Terminal This page is obsolete.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 and the Java interpreter java to run them.
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To verify that Apple's implementation of Java 2 Standard Edition (Java SE 6) is already installed:. Run Software Update. Run Applications/Utilities/Java/Java Preferences and verify that the Java SE 6 - 64-bit entry is checked and first 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 under Go - Applications - Utilities.
Drag the Terminal to your dock since you 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: machine: wayne$. To check that you are running the right version of Java, type the commands in boldface below. You should see something similar to the information printed below. The important part is that it says 1.6 or 1.5 (and not 1.4). Machine: wayne$ java -version java version '1.6.026' Java(TM) SE Runtime Environment (build 1.6.026-b03-3) Java HotSpot(TM) 64-Bit Server VM (build 20.1-b02-384, mixed mode) Then type machine: wayne$ javac -version javac 1.6.026. Since you will be using the Terminal frequently, you may want to customize the default window settings (e.g., Monaco 13pt font with antialiasing). Compile the program You will use the javac command to convert your Java program into a form more amenable for execution on a computer.
From the Terminal, navigate to the directory containing your.java files, say wayne/introcs/hello, by typing the cd command below. Machine: wayne$ cd introcs/hello machine:/introcs/hello wayne$. Assuming the file, say HelloWorld.java is in the current working directory, type the javac command below to compile it. Machine:/introcs/hello wayne$ javac HelloWorld.java machine:/introcs/hello wayne$ 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. Machine:/introcs/hello wayne$ java HelloWorld Hello, World 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 signify to your program that there is no more data by typing Ctrl-d for EOF (end of file).
Why is Oracle Java available only for Mac OS X 10.7.3 and above? Java Runtime depends on the availability of an Application programming interface (API).
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.class or.java. If this was not your problem, it's possible that your CLASSPATH was set by some other program so that it no longer includes the current working directory. Try running your program with the command line machine:/introcs/hello wayne$ java -cp./ HelloWorld If this works, your is set incorrectly. I get the error 'class file has wrong version 50.0, should be 49.0' when I compile from 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, launch Java Preferencest. Drag the Java SE 6 - 64-bit entry to appear first. How do I get the menu to display at the top of 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 the.
In this tutorial I will show you how to connect remotely to your Raspberry Pi from your PC or Mac. After you you don’t need to let it constantly connected with mouse, keyboard and monitor – you can control it remotely using your Mac or PC. For this tutorial leave only the LAN cable and power supply connected. Of course you also have to power up the Raspberry. Once the green leds are on you can start with the remote connection.
Enable SSH on Raspbian As of the November 2016 release, Raspbian has the SSH server disabled by default. It can be enabled: Manually from the desktop.
Launch Raspberry Pi Configuration from the Preferences menu. Navigate to the Interfaces tab. Select Enabled next to SSH. Click OK Alternatively, raspi-config can be used. Enter sudo raspi-config in a terminal window. Select Interfacing Options.
Navigate to and select SSH. Choose Yes. Select Ok. Choose Finish For headless setup SSH can be enabled by placing a file named ssh, without any extension, onto the boot partition of the SD card. When the Pi boots, it looks for the ssh file.
If it is found, SSH is enabled, and the file is deleted. The content of the file does not matter: it could contain text, or nothing at all. Connect with PC PuTTY is a free SSH client for Windows.
The executable (putty.exe) from the official page. Enter the IP of your Raspberry under “Host Name(or IP address)” and leave the port to 22. Now press the “Open” button. In the next screen enter your username and password. Default Raspbian user is: pi and the password is: raspberry That’s it! You are now connected and you can execute whatever linux command you like. Note: I recommend to assign a static IP to your Raspberry from your router.
This way you don’t have to check for the IP of the Raspberry each time the router assigns a new one to it. Transfer Files between PC and Raspberry Pi Another useful tool I want to show you is WinSCP. It is a secure FTP client giving you the ability to transfer files from or to your Raspberry Pi.
You can download WinSCP from the. Once downloaded and installed, type in the IP, username and password of your Raspberry and hit the “Login” button. Connect from Mac Open Terminal and type in: ssh [email protected] You will be prompted for a password to enter. Don’t forget to replace here [email protected] the username pi (if you have cahnged it) and the IP with your current Raspberry Pi IP.
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