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If all goes well, you should see the following message in the Compiler Output pane at the bottom: Compilation completed. If DrJava complains in some way, you mistyped something. Check your program carefully, using the error messages in the Compiler Output pane as a guide. Execute the Program in DrJava Now it is time to run your program. This is the fun part. Type the following in the Interactions pane at the bottom. By convention, we highlight the text you type in boldface. Ask for help if you can't see the mistake. Congratulations, you are now a Java programmer!

Command-Line Interface with the Terminal The command-line provides capabilities beyond those available in DrJava, including redirection and piping. You will type commands in an application called the Terminal. The installer creates a shortcut on the desktop to the Terminal. Double-click it to launch the Terminal. Compile the Program from the Terminal 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 HelloWorld. To make our textbook standard libraries accessible to Java, use the command javac-introcs instead.

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For example, BouncingBall. Execute the Program from the Terminal You will use the java command to execute your program. From the Terminal, type the java command below. To make our textbook standard libraries accessible to Java, use the command java-introcs instead. For example, to execute BouncingBall. Once downloaded, the Oracle Java installer should take about 10 seconds and the introcs.

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The installer didn't work on my machine. What should I do? If these don't resolve the issue, please contact a staff member to identify what went wrong. When I run the installer, the terminal window just waits after asking for a password.

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But, I don't even have a password-enabled account. You must have a non-blank password. Here are instructions for resetting a user's password. Your user account and OS must be on the same volume. This is likely due to OS X Sierra path randomization. Use the Finder to move introcs. What does the installer do? In short, it downloads, installs, and configures Checkstyle, Findbugs, and DrJava, and the textbook standard libraries.

Here is a more detailed list: Checks that Java is installed.

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Downloads the textbook standard libraries from stdlib. Downloads the Java wrapper scripts javac-introcs and java-introcs. Downloads and installs Findbugs 3. Downloads our findbugs configuration file findbugs.

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Downloads and installs PMD 5. Downloads our PMD configuration file pmd. Downloads and installs Checkstyle 8. Downloads our checkstyle configuration file checkstyle-introcs. Downloads and installs the latest stable version of DrJava , from DrJava. Creates a shortcut to DrJava on the Desktop.

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Downloads and installs the DrJava configuration file from drjava-config. Note that this will overwrite any existing. Tests that the installation succeeded by compiling and executing TestIntroCS. Why does the installer need my password? How do I completely uninstall introcs. What happens if I re-run the installer? It will re-download, install, and configure Checkstyle, Findbugs, DrJava, and our textbook libraries.

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Can I use a different version of Java? For example:. To uninstall the JDK, you must have Administrator privileges and execute the remove command either as root or by using the sudo 8 tool. This directory is part of the system software and any changes will be reset by Apple the next time you perform an update of the OS. Skip to Content. Administrator privileges. Depending on your processor, the downloaded file has one of the following names: jdk-8u version -macosx-amd Download the file.

Before the file can be downloaded, you must accept the license agreement. Double click the package icon to launch the Install app.

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The Install app displays the Introduction window. Note: In some cases, a Destination Select window appears. This is a bug, as there is only one option available. If you see this window, select Install for all users of this computer to enable the Continue button. There can be multiple JDKs installed on a system, as many as you wish.