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This DrJava-based Java programming environment is no longer being supported(because DrJava in no longer being actively developed and DrJava is incompatible with Java 11).It has been replaced by the following IntelliJ-based programming environment forMac OS X.
This document instructs you on how to set up our Java programming environment for your Mac OS X computer. It also provides a step-by-step guide for creating, compiling, and executing a Java program using either DrJava or Terminal.All of the software used is freely available. Virtual table tennis ping pong mac os.
You will need a Mac runningMac OS X 10.8 (Mountain Lion) to Mac OS X 10.13 (High Sierra).

0. Install the Programming Environment

Our installer downloads, installs, and configures the Java programming environment you will be using, including DrJava, the textbook libraries, and the Terminal.
Log in to the user account in which you will be programming.Your account must have Administrator privileges (with a non-blank password)and you must be connected to the Internet.
Install Oracle's implementation of the Java Platform, Standard Edition Development Kit (JDK 8).Do not install either JDK 9 or JDK 10, as they are currently incompatible with DrJava.Browse toJava SE Development Kit 8u171.In the first table, check Accept License Agreementand the click jdk-8u171-macosx-x64.dmg,which corresponds to the entry for Mac OS X.The exact verison 8u171 is not essential.
 Double click the downloaded file jdk-8u171-macosx-x64.dmg to begin the installation.Enter your OS X password when prompted.We recommend all of the default options.
 Delete jdk-8u171-macosx-x64.dmg.
To install,Download algs4.zip;if using OS X 10.12 (or higher), move it to a different folder;double-click it to unzip (if necessary). This creates algs4.app.
Double-click algs4.app to perform the installation.If you receive a warning that algs4.app is an applicationdownloaded from the Internet, click Open.
Enter your OS X password when prompted.
If the installation succeeds, you will see the following: A Terminal window containing approximately thisexecution log.
 A Standard Drawing window containing a red bullseye and a textbook graphic.
Delete algs4.zip and algs4.app.

1. Create the Program in DrJava

Now you are ready to write your first Java program.You will develop your Java programs in an application called DrJava.DrJava features many specialized programming tools including syntax highlighting,bracket matching, auto indenting, and line numbering.
The installer creates a shortcut to DrJava on the desktop.Double-click it to launch DrJava.If you receive a warning about incoming network connections,click Allow.
In the main DrJava window, type the Java programHelloWorld.java exactly as it appears below. If you omit even a semicolon, the program won't work. As you type, DrJava does the indenting for you.
 Finally, click the Save button to save the file, using the name HelloWorld.java.The filename is case sensitive and must exactly match the name of theclass in the Java program.

2. Compile the Program from DrJava
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It is now time to convert your Java program into a form more amenable for execution on a computer. To do this, click the Compile button.If all goes well, you should see the following message in the Compiler Outputpane at the bottom:
 If DrJava complains in some way, you mistyped something.Check your program carefully, using the error messages in the Compiler Output paneas a guide.

3. Execute the Program from 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. If all goes well, you should see the following message:
 You may need to repeat this edit–compile–execute cycle a few times before it works.

4. Command-Line Interface

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. You should see something like:The ~ is shorthand for your home directory /Users/username;the name machine will be replaced by the name of your machine;the name username will be replaced by your username.
To confirm that the Java compiler is installed,type the command in boldface below and check that the results match:It's important that you see the number 1.8 for the Java version number, but the rest is not critical.
To confirm that the Java interpreter is installed, typethe command in boldface below and check that the results match:Again, it's important that you see the number 1.8 for the Java version number, but the rest is not critical.

5. 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.java,say /Users//intros/hello,by typing the cd (change directory) commands below:
Compile it by typing the javac command below:Assuming the file HelloWorld.java is in the current working directory,you should see no error messages.
To make our textbook libraries accessible to Java,use the command javac-algs4 instead.For example, to compile TestAlgs4.java,which uses our standard drawing library,the auto-installer issues the following command:At this time,javac-cos226 andjavac-courseraare equivalent tojavac-algs4.

6. Execute the Program from the Terminal

You will use the java command to execute your program.
From the Terminal, type the java command below.You should see the output of the program.
To make our textbook libraries accessible to Java,use the command java-algs4 instead. For example, to test standarddrawing and standard audio, type the following two commands:At this time,java-cos226 andjava-courseraare equivalent tojava-algs4.

7. Static Code Analysis Tools

You can useFindbugs,PMD,andCheckstyleand to check the style of your programs and identify common bug patterns.
 To run Findbugs 3.0.1, type the following command in the Terminal:The argument must be a list of .class files.Here is a list ofbug descriptions.
 To run PMD 5.8.1, type the following command in the Terminal:The argument must be either the name of a single .java file ora directory containing one or more .java files.Here is a list of bug patterns.
 To run Checkstyle 8.2, type the following command in the Terminal:The argument must be a list of .java files.Here is a list ofavailable checks.
COS 226 students should use the following versions of these commands, to match the correspondingversions in the autograder:
Coursera students should use the following versions of these commands, to match the correspondingversions in the autograder:

Troubleshooting

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I previously used the introcs.app installerfrom the textbook Computer Science: An Interdisciplinary Approach.Should I use the algs4.app installer?Yes, we recommend using the algs4.app installer because it will installalgs4.jar, as well as the corresponding commands javac-algs4 and java-algs4.
How long should the installer take?Once downloaded, the Oracle Java installer should take about 10 seconds andthe algs4.app installer should take about 20 seconds.If you have virus detection software running (such as McAfee Endpoint), eachcould take 5–10 minutes (or more).
The installer didn't work on my machine. What should I do?Please read the next few Q+As. If these don't resolve the issue,please contact a staff member to identify what went wrong.
When I run the installer, I get the error message'bash: /Volumes/Macintosh: No such file or directory.'Your user account and OS must be on the same volume. Promotion man mac os.
When I run the installer, the Terminal windows just waits after asking for a password.But, I don't even have a password-enabled account.You must have a non-blank password.Here are instructions forresetting a user's password.
When I run the installer, I get an error like 'bash: /private/var/folders/70/n8stth1d1x33hrw8n07kf1280000gn/T/AppTranslocation/45FC25B7-17E3-46DF-AC27-9A7EF56DDFD3/d/algs4.app/Contents/Resources/launcher.sh: No such file or directory.' What should I do?This is likely due to OS X Sierra path randomization.Use the Finder to move algs4.app to some other folder and try again.
When I run the installer, I receive the following error after I enter my password:'bash: /???/Users//Desktop/algs4.app/Contents/Resources/launcher.sh: No such file or directory.'We're not sure what causes this (but we think it is related to users with dual-boot systems / USB drives).Try opening a Terminal windows and typing
What does the installer do?In short, it downloads, installs, and configures Checkstyle, Findbugs, DrJava, and our textbook libraries. Here is a more detailed list:
Checks that Java is installed.
 Downloads the textbook library fromalgs4.jar.
Downloads the Java wrapper scriptsjavac-algs4 andjava-algs4.
Downloads and installsFindbugs 3.0.1from findbugs.zip.Downloads our findbugs configuration file findbugs.xmland wrapper script findbugs-algs4.
Downloads and installsPMD 5.8.1from pmd.zip.Downloads our PMD configuration file pmd.xmland wrapper script pmd-algs4.
Downloads and installsCheckstyle 8.2from checkstyle.zip.Downloads our checkstyle configuration file checkstyle-algs4.xmland wrapper script checkstyle-algs4.
Downloads and installs the latest stable version ofDrJava,from DrJava.zip.Creates a shortcut to DrJava on the Desktop.Downloads the DrJava configuration file from.drjavato /Users//.drjava.Note that this will overwrite any existing .drjava configuration file.
 Tests that the installation succeeded by compiling and executing TestAlgs4.java.
Why does the installer need my password?The installer copies files into/usr/local/bin and/usr/local/algs4,which require elevated privileges.
How do I completely uninstall algs4.app?
Delete the directory /usr/local/algs4.
 To uninstall DrJava, delete the following two files:/Applications/DrJava.app.
/Users//.drjava.
 To uninstall the Java, Findbugs, PMD, and Checkstyle, wrapper scripts,delete the following files:/usr/local/bin/javac-{algs4,cos226,coursera}
/usr/local/bin/java-{algs4,cos226,coursera}
/usr/local/bin/findbugs-{algs4,cos226,coursera}
/usr/local/bin/pmd-{algs4,cos226,coursera}
/usr/local/bin/checkstyle-{algs4,cos226,coursera}
 Delete the shortcut to DrJava and Terminal on the Desktop.
What happens if I rerun the installer?It will re-download, install, and configureFindbugs, PMD, Checkstyle, DrJava, and our textbook libraries.
Can I use a different version of Java?Any version of Java 8 (either Oracle or OpenJDK) should work fine.Note that neither Java nor Findbugs work with Java 9.
I have both Java 8 and Java 9 installed, but the default version is Java 9. How doI change the default version back to Java 8?To disable Java 9, type the following commands in the Terminal:
You should still be able to use Java 9 by specifying the full path tojavac and java, e.g.,

/Library/Java/JavaVirtualMachines/jdk-9.0.1.jdk/Contents/Home/bin/javac. Why I try to run DrJava, I get the following error message. How should I proceed?
 Are you sure that you are using the version of DrJava that was installedby our auto-installer (and not downloaded from the DrJava website)?We suggest deleting any older versions of DrJava andusing the one that the auto-installer copied to the /Applicationsdirectory.Can I use a different IDE?Yes you can use another IDE (such as Eclipse) butyou will have to configure the IDE properties yourself (such as the classpath). Reset Interactions;From the Terminal, type Ctrl-c.
When using standard input, how do I signify that there is no more data?If you are entering input from the keyboard, type Ctrl-d for EOF (end of file)from either DrJava or the Terminal.-->
When I compile or execute a program in Terminal that uses one of thetextbook libraries, I get an error that it cannot find the library. How can I fix this?Be sure that you are using the wrapper scripts /usr/local/bin/javac-algs4and /usr/local/bin/java-algs4.
Which shell should I use in the Terminal?The default shell in Mac OS X is bash, but feel free to use a different one if you prefer.
What's the sha256sum of algs4.zip?483786a1197b7282b92c846667e847cd31a97a4e42bca71f95e21a2ce668fc33
Last modified on August 14, 2019.
Copyright © 2000–2019Robert SedgewickandKevin Wayne.All rights reserved.
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