How To Check For Java On A Mac
Open Start menu and search for “Java”: Launch Check For Updates – this will open Java Control Panel on Update tab: Press Check Now and If updates are available installation will start: Press “Update” to update Java: So Java update is successfully installed. Go to System Preferences and click on Java icon on the bottom.
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Java and the Mac OS X Terminal Java and the Mac OS X Terminal This page is obsolete.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. 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 '1.6.0_26' Java(TM) SE Runtime Environment (build 1.6.0_26-b03-3) Java HotSpot(TM) 64-Bit Server VM (build 20.1-b02-384, mixed mode) Then type machine:~ wayne$ javac -version javac 1.6.0_26 • 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). 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.
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