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How to: Fix Java Command-Line Tool Pop-Up on Mac OS Truong Nguyen August 29, 2017 How-To After upgrading to a newer version of Mac OS X (Yosemite 10.10 and El Capitan 10.11) or macOS (Sierra 10.12 and High Sierra 10.13), you may end up getting an annoying new pop-up message whenever you start your computer. People not already using Home-brew can simply download a Mac installer from a trusted source. Running a console such as Terminal.app and type java -version to see the brand and version number of your JVM. After verifying success, dismount the.dmg image in. Java is a general-purpose programming language and an environment for running that language. If you have Java installed, you at least have the Java Runtime Environment (JRE), which allows you to run Java software on your computer or device. You may also have the Java Development Kit (JDK), which is intended for writing Java software.
Java and the Mac OS X Terminal
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This document instructs you on how to use the Mac OS X Terminal with Java.
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).
Mac Download Java From Terminal Commands
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.
![Mac Mac](/uploads/1/3/4/8/134836907/105815015.jpg)
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.
Free prince downloads. 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.
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.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.
![Mac Mac](/uploads/1/3/4/8/134836907/524825355.jpg)
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
Online Java Terminal
Where can I learn more about the command line?Here is a short tutorial on thecommand-line.