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Java Оку For Mac Os

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being supported(because DrJava in no longer being actively developed and DrJava is incompatible with Java 11).It has been replaced by the following IntelliJ-based programming environment forMac OS X.
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This document instructs you on how to set up a Java programming environment for your Mac OS X computer. It also provides a step-by-step guide for creating and compiling a Java program in IntelliJ and executing it from the command line. You will need a Mac running Mac OS X 10.13 (High Sierra) to Mac OS X 10.15 (Catalina). Go to 'Mac OS X' tab and check the 'Include the Java Product in the Mac OS build' option. Click on the  Build  toolbar button. Two setup packages will be built: a Windows compliant setup and a Mac OS X compliant package. The built Mac OS X package is a self extracting ZIP archive.
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 the Terminal.All of the software used is freely available.
Matlab for mac cracked. You will need an Intel-based Mac runningMac OS X 10.8 (Mountain Lion) to Mac OS X 10.13 (High Sierra).
You can defer steps 4–6 until Section 1.5 of the textbook.

0. Install the Programming Environment

Our installer downloads, installs, and configures the Java programming environment you will be using, including DrJava, and the standard libraries from our textbook.
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 introcs.zip to the Desktop;double-click it to unzip (if necessary). This creates introcs.app. Security and Privacy -> General -> Allow applications downloaded from: Anywhere. To enable this option, you may need to click the lock in the lower left-hand corner(and type your password when prompted).-->
Double-click introcs.app to perform the installation.If you receive a warning that introcs.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 introcs.zip and introcs.app.

1. Create the Program in DrJava
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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 in DrJava

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 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. 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. Ask for help if you can't see the mistake.
Congratulations, you are now a Java programmer! 
4. 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.You should see something like:The ~ is shorthand for your home directory /Users/.
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 1.8for the Java version number, but the rest is not critical.
To confirm that you 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 1.8for 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 ~/Desktop/hello,by typing the cd (change directory) commands below:The ~ is shorthand for /Users/.
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 standard libraries accessible to Java,use the command javac-introcs instead.For example,BouncingBall.javais a program that uses our standard drawing library.After downloading the file to the current directory,you can compile it with the following command:

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 standard libraries accessible to Java,use the command java-introcs instead. For example, to executeBouncingBall.java(assuming you downloaded and compiled it in the previous step), type the following command:

Troubleshooting

How long should the installer take?Once downloaded, the Oracle Java installer should take about 10 seconds and the introcs.app installer should take about 20 seconds. If you have virus detection software running (such as McAfee Endpoint), each could take 5–10 minutes (or more).
The installer didn't work on my machine. What should I do?Check out the following three Q+As. 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.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.
Java Jre For Mac OsWhen 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.
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 introcs.app to some other folder and try again.
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.
 Downloads the textbook standard libraries fromstdlib.jar.
Downloads the Java wrapper scriptsjavac-introcs andjava-introcs.
Downloads and installsFindbugs 3.0.1from findbugs.zip.Downloads our findbugs configuration file findbugs.xml and wrapper script findbugs-introcs.
Downloads and installsPMD 5.8.1from pmd.zip.Downloads our PMD configuration file pmd.xmland wrapper script pmd-introcs.
Downloads and installsCheckstyle 8.2from checkstyle.zip.Downloads our checkstyle configuration file checkstyle-introcs.xml and wrapper script checkstyle-introcs.
Downloads and installs the latest stable version ofDrJava,from DrJava.zip.Creates a shortcut to DrJava on the Desktop.Downloads and installs the DrJava configuration file fromdrjava-config.txtto /Users//.drjava.Note that this will overwrite any existing .drjava configuration file.
 Tests that the installation succeeded by compiling and executing TestIntroCS.java.
Why does the installer need my password?The installer copies files into /usr/local/bin and/usr/local/introcs,which require superuser privileges.
How do I completely uninstall introcs.app?
Delete the directory /usr/local/introcs.
 To uninstall DrJava, delete the following two files:/Applications/DrJava.app.
/Users//.drjava.
 To uninstall the Java, Checkstyle, and Findbugs wrapper scripts,delete the following files:/usr/local/bin/javac-introcs
/usr/local/bin/java-introcs
/usr/local/bin/findbugs-introcs
/usr/local/bin/pmd-introcs
/usr/local/bin/checkstyle-introcs
 Delete the shortcut to DrJava and Terminal on the Desktop.
What happens if I re-run the installer?It will re-download, install, and configure Checkstyle, Findbugs, 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 DrJava does not currently 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 and using the one that the auto-installer copied to the /Applications directory.Java Jre For Macos 64-bitCan 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 typing input in the Terminal or DrJava, type Ctrl-d on its own line.
I successfully compiled HelloWorld.java with javac, but, when I execute,I get the error message'Exception in thread 'main' java.lang.NoClassDefFoundError: HelloWorld'.What am I doing wrong?First, verify that the file HelloWorld.class is in the current directory.Be sure to type java HelloWorld without a trailing .classor .java.-->
When I compile or execute a program in Terminal that uses thetextbook standard library, I get an error that it cannot find the library. How can I fix this?Use the wrapper scripts javac-introcs and java-introcs,which add stdlib.jar to the Java classpath.
Which shell should I use in the Terminal?Bash is the default shell in Mac OS X, but feel free to usewhichever one you prefer.

0. Install the Programming Environment

Our installer downloads, installs, and configures the Java programming environment you will be using, including DrJava, and the standard libraries from our textbook.
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 introcs.zip to the Desktop;double-click it to unzip (if necessary). This creates introcs.app. Security and Privacy -> General -> Allow applications downloaded from: Anywhere. To enable this option, you may need to click the lock in the lower left-hand corner(and type your password when prompted).-->
Double-click introcs.app to perform the installation.If you receive a warning that introcs.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 introcs.zip and introcs.app.

1. Create the Program in DrJava
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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 in DrJava

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 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. 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. Ask for help if you can't see the mistake.
Congratulations, you are now a Java programmer! 
4. 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.You should see something like:The ~ is shorthand for your home directory /Users/.
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 1.8for the Java version number, but the rest is not critical.
To confirm that you 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 1.8for 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 ~/Desktop/hello,by typing the cd (change directory) commands below:The ~ is shorthand for /Users/.
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 standard libraries accessible to Java,use the command javac-introcs instead.For example,BouncingBall.javais a program that uses our standard drawing library.After downloading the file to the current directory,you can compile it with the following command:

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 standard libraries accessible to Java,use the command java-introcs instead. For example, to executeBouncingBall.java(assuming you downloaded and compiled it in the previous step), type the following command:

Troubleshooting

How long should the installer take?Once downloaded, the Oracle Java installer should take about 10 seconds and the introcs.app installer should take about 20 seconds. If you have virus detection software running (such as McAfee Endpoint), each could take 5–10 minutes (or more).
The installer didn't work on my machine. What should I do?Check out the following three Q+As. 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.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.
Java Jre For Mac OsWhen 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.
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 introcs.app to some other folder and try again.
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.
 Downloads the textbook standard libraries fromstdlib.jar.
Downloads the Java wrapper scriptsjavac-introcs andjava-introcs.
Downloads and installsFindbugs 3.0.1from findbugs.zip.Downloads our findbugs configuration file findbugs.xml and wrapper script findbugs-introcs.
Downloads and installsPMD 5.8.1from pmd.zip.Downloads our PMD configuration file pmd.xmland wrapper script pmd-introcs.
Downloads and installsCheckstyle 8.2from checkstyle.zip.Downloads our checkstyle configuration file checkstyle-introcs.xml and wrapper script checkstyle-introcs.
Downloads and installs the latest stable version ofDrJava,from DrJava.zip.Creates a shortcut to DrJava on the Desktop.Downloads and installs the DrJava configuration file fromdrjava-config.txtto /Users//.drjava.Note that this will overwrite any existing .drjava configuration file.
 Tests that the installation succeeded by compiling and executing TestIntroCS.java.
Why does the installer need my password?The installer copies files into /usr/local/bin and/usr/local/introcs,which require superuser privileges.
How do I completely uninstall introcs.app?
Delete the directory /usr/local/introcs.
 To uninstall DrJava, delete the following two files:/Applications/DrJava.app.
/Users//.drjava.
 To uninstall the Java, Checkstyle, and Findbugs wrapper scripts,delete the following files:/usr/local/bin/javac-introcs
/usr/local/bin/java-introcs
/usr/local/bin/findbugs-introcs
/usr/local/bin/pmd-introcs
/usr/local/bin/checkstyle-introcs
 Delete the shortcut to DrJava and Terminal on the Desktop.
What happens if I re-run the installer?It will re-download, install, and configure Checkstyle, Findbugs, 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 DrJava does not currently 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 and using the one that the auto-installer copied to the /Applications directory.Java Jre For Macos 64-bitCan 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 typing input in the Terminal or DrJava, type Ctrl-d on its own line.
I successfully compiled HelloWorld.java with javac, but, when I execute,I get the error message'Exception in thread 'main' java.lang.NoClassDefFoundError: HelloWorld'.What am I doing wrong?First, verify that the file HelloWorld.class is in the current directory.Be sure to type java HelloWorld without a trailing .classor .java.-->
When I compile or execute a program in Terminal that uses thetextbook standard library, I get an error that it cannot find the library. How can I fix this?Use the wrapper scripts javac-introcs and java-introcs,which add stdlib.jar to the Java classpath.
Which shell should I use in the Terminal?Bash is the default shell in Mac OS X, but feel free to usewhichever one you prefer.
Where can I learn more about the command line?Here is a short tutorial on thecommand line.
Last modified on August 14, 2019.
Copyright © 2000–2019Robert SedgewickandKevin Wayne.All rights reserved.

This document instructs you on how to set up a Java programming environment for your Mac OS X computer. It also provides a step-by-step guide for creatingand compiling a Java program in IntelliJ and executing itfrom the command line.
You will need a Mac runningMac OS X 10.13 (High Sierra) to Mac OS X 10.15 (Catalina).

 0. Install the Java Programming Environment

The installer installs and configures a Java programming environment, includingOpenJDK 11 andIntelliJ IDEA, Community Edition 2020.1.
Log in to the user account in which you will be programming.Your account must have Administrator privileges.
Download the Mac OS X installerlift-java.pkg.
Double-click lift-java.pkg to install the software.Enter your Mac OS X password when prompted and use all of the default options.Warning
If you have previously used IntelliJ,run this installer only if you want a clean re-install.The installer overwrites IntelliJ IDEA CE.app andany previous IntelliJ 2020.1 settings.
Delete lift-java.pkg (if it is not automatically deleted).

 1. Open a Project in IntelliJ

You will develop your Java programs in an application called IntelliJ IDEA, Community Edition.
IntelliJ organizes Java programs into projects.In our context, each project corresponds to one programming assignment.A typical project contains Java programs, associated data files, andcourse-specific settings (such as compiler options, style rules, and textbook libraries).
Download the project for your programming assignment to a convenient location(such as the Desktop).[ sample project for COS 126 (Princeton) ]
[ sample project for COS 226 (Princeton) ]
[ sample project for Computer Science: Programming with a Purpose (Coursera) ]
[ sample project for Algorithms, Part I (Coursera) ]
Double click the zip file to unzip.This creates a project folder with thename of the corresponding programming assignment (such as helloor percolation).Delete the zip file.

Warning
The project folders contain course-specific information. Be sure to downloadthe one corresponding to your institution and course.

Launch IntelliJ via Finder → Applications → IntelliJ IDEA CE.app.
When you launch IntelliJ for the first time,IntelliJ may displaytheJetBrains privacy policy.Scroll down and Accept.
IntelliJ may ask if you want to send anonymous usage statistics to JetBrains. Choose your preferred option.
To open a project from the Welcome screen,click Open and select the project folder.You should see an assignment logo (in the main editor window) and a list of project files (in the Project View sidebar at left).
When you launch IntelliJ for the first time,it may take a minute or two to index your files;some features (such as auto importing) will be unavailable until this process completes.
Warning
Do not select Create New Project;this option is intended for advanced programmers.Also, always use Open with a project folder, not an individual file.

When you are finished working, select the menu optionIntelliJ IDEA → Quit IntelliJ IDEA (⌘Q) to exit IntelliJ.The next time you launch IntelliJ, your recent projectswill appear in the Welcome screen for easy access.

Java Jre 6 Mac Os X Download 2. Create a Program in IntelliJ

Now you are ready to write your first Java program.IntelliJ features many specialized programming toolsincluding line numbering, syntax highlighting, bracket matching, auto indenting,auto formatting, auto importing, variable renaming, and continuous code inspection.
To create a new Java program: Re-open IntelliJ and the project (if you closed it in the previous step).
Click the project name in the Project View sidebar (at left), so that itbecomes highlighted.
Select the menu option LIFT → New Java Class.When prompted, type HelloWorld for the Name and click OK.

In the main editor window, complete the Java programHelloWorld.java exactly as it appears below.(IntelliJ generates the gray boilerplate code automatically,along with the course header block comment.)If you omit even a semicolon, the program won't work.
As you type, IntelliJ highlights different syntactic elementsin different colors.When you type a left bracket, IntelliJ adds the matching right bracket.When you begin a new line, IntelliJ indents it.
To save the file, select the menu option File → Save All (⌘S).When you save the file, IntelliJ re-formats it (if necessary).

Java Jre 7 Mac Os 3. Compile and Execute the Program (from IntelliJ)

Now, it is time to execute (or run) your program.This is the exciting part, where your computer follows the instructionsspecified by your program.Before doing so, you must compile your program intoa form more amenable for execution on a computer.
Select the program that you wish to compile and execute in the the Project View sidebar. The program should now appear in the main editor window.
To compile your program,select the menu optionLIFT → Recompile 'HelloWorld.java' (⌘B).If the compilation succeeds, you will receive confirmationin the status bar (at bottom).If the compilation fails, a Recompile panel will open up (at bottom),highlighting the compile-time errors or warnings.Check your program carefully for typos, using the error messages as a guide.
To execute your program,select the menu option LIFT → Run 'HelloWorld' with Arguments (⌘E).Since this program takes no command-line arguments, click OK.You should see the output of the program (in white), along with a messagethat the program finished normally (with exit code 0).

Tip
Use the LIFT menu to compile and execute your program from IntelliJ.The Build and Run menus support additional options for advanced programmers.
Also be sure that the main editor window is active before using the LIFTmenu (e.g., by clicking the code you want to compile or execute).

 4. Compile and Execute the Program (from the command line)

The command line is a simple and powerful mechanism forcontrolling your programs (e.g., command-line arguments,file redirection, and piping).IntelliJ supplies an embedded terminalfor easy access to the command line.
Macos Java Jre Select the menu option View → Tool Windows → Terminal (⌘2).
 This will launch a Bash terminal where you type commands.You will see a command prompt that looks something like this:The ~/Desktop/hello is the current working directory, where~ is shorthand for your home directory.
To compile your program,type the following javac command.More specifically, type the text in yellow that appears on the same line as thecommand prompt.Assuming that the file HelloWorld.java is in the current working directory,you should not see any compile-time errors or warnings.
 To execute your program,type the following java command:You should see the output of your program beneath the line on which you typed the command.
Tip
Typically, you should compile from IntelliJ(because IntelliJ highlights the lines on which anycompile-time errors or warnings occur) and execute from the command line(because the command line makes it is easy to specify command-line argumentsand use file redirection).
Download Java Jre For Mac Os X
 5. Textbook Libraries (from the command line)
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To make our textbook libraries accessible to Java from the command line,you will use our wrapper scripts.
Computer Science: An Interdisciplinary Approach (including COS 126 students).The programBarnsley.javauses our standard drawing and standard random libraries in stdlib.jar to draw aBarnsley fern.First download Barnsley.java.Then, use the Finder to move itto a project folder (such as hello).Finally, to compile and execute it,type the following commands in the terminal:When you execute the program, a standard drawing window will appearand an image like this one will be generated, one point at a time:To get your command prompt back, close the standard drawing window.
Algorithms, 4th Edition (including COS 226 and Coursera students).The programCollidingDisks.javauses various libraries in algs4.jarto simulate the motion of n disks subject to the lawsof elastic collision.First download CollidingDisks.javaThen, use the Finder to move it to a project folder (such as percolation).Finally, to compile and execute it,type the following commands in the terminal:When you execute the program, a standard drawing window will appearwith an animation of 20 colliding disks.To get your command prompt back, close the standard drawing window.
 Frequently Asked Questions


I installed IntelliJ and Java using the lift-java.pkg installerlast semester or year. Should I rerun this semester?Yes. This installer includes IntelliJ 2020.1and Java 11.The old installer may have used an earlier version of IntelliJ or Java.I previously used either the introcs.app or algs4.app installer.Should I use the lift-java.pkg installer?Yes. This installer includes IntelliJand Java 11 (instead of DrJava and Java 8).What happens if I rerun the lift-java.pkg installer?It will re-install and re-configure OpenJDK 11, IntelliJ,SpotBugs, PMD, Checkstyle, our textbook libraries,and wrapper scripts.The installer failed. How can I investigate why?Check the installer log at /var/log/lift.log.I have Mac OS X 10.12 (Sierra). Is that too old?Yes.Yes. IntelliJ 2020.1 requires Mac OS X 10.13 (or newer).How long will the installer take to complete installation?Once downloaded, it should take about a minute.If you have anti-malware protection software running (such as McAfee Endpoint), it couldtake 5–10 minutes.What does the lift-java.pkg installer do?In short, it installs and configures Java, IntelliJ,SpotBugs,PMD,Checkstyle,and our textbook libraries,along with accompanying command-line tools.Here is a more detailed list: Installs OpenJDK 11.0.7.
 InstallsIntelliJ 2020.1.1with customized user preferences,available indepedently as lift-intellij.pkg.
Installs the following command-line tools for Java, available independently aslift-cli.pkg. The textbook librariesstdlib.jar andalgs4.jar.
Java wrapper scripts, includingjavac-algs4 and java-algs4.
Custom.bashrc,.bash_profile, and.inputrc files.As a precaution, the installer will do this only if detects no preexistingbash configuration files.
SpotBugs 4.0.3;our SpotBugs configuration file spotbugs.xml;and wrapper script spotbugs.
PMD 6.15.0;our PMD configuration file pmd.xml;and wrapper script pmd.
Checkstyle 8.31;various configuration files(checkstyle-cos126.xml,checkstyle-cos226.xml,checkstyle-coursera.xml, andcheckstyle-suppressions.xml);custom checks checkstyle-lift.jar;and wrapper script checkstyle.
How is the software licensed?All of the included software is licensed under various open-source licenses.IntelliJ IDEA, Community Edition is licensed under theApache License, Version 2.0.
OpenJDK 11 is licensed under theGNU General Public License,version 2, with the Classpath Exception.
SpotBugs is licensed under theGNU Lesser Public License, Version 2.1.
Checkstyle is licensed under theGNU Lesser Public License, Version 2.1.
PMD is licensed under a BSD-style license.
stdlib.jar and algs4.jar are licensed under theGNU General Public License, Version 3.
What's the sha256sum of lift-java.pkg?e5ef947039280e0b0520fd7bd3aff8a0373719b96b1745c08a42441f6554fafeCan I run the installer from the command line?Yes. Use the command sudo installer -verbose -pkg lift-java.pkg -target /How can I uninstall the software? To uninstall OpenJDK 11,delete the following directory:/Library/Java/JavaVirtualMachines/jdk-11.0.7.jdk/
 To uninstall IntelliJ, delete the following:/Applications/IntelliJ IDEA CE.app
~/Library/Application Support/JetBrains/IdeaIC2020.1/
~/Library/Caches/JetBrains/IdeaIC2020.1/
~/Library/Logs/JetBrains/IdeaIC2020.1/
To uninstall SpotBugs, PMD, Checkstyle,and our textbook libraries, delete the following directory:/usr/local/lift/
 To uninstall our wrapper scripts, delete the following files:/usr/local/bin/javac-{algs4,introcs}
/usr/local/bin/java-{algs4,introcs}
/usr/local/bin/jshell-{algs4,introcs}
/usr/local/bin/spotbugs
/usr/local/bin/pmd
/usr/local/bin/checkstyle
Java FAQ
Can I use a vendor and version of Java other than OpenJDK 11?Yes.You may use any version of Java 8, Java 9, Java 10, or Java 12, from either Oracle or OpenJDK.However, if you do so, you will need to manually configure the Platform SDK and Project SDK viaIntelliJ via File → Project Structure.How can I check which version of Java is installed (and where it is installed)?Type the following commands in the terminal:It's important that the Java version numbers match and that you see the number11,but the rest is not critical.How does this custom version of IntelliJ different from the standard one?IntelliJis an industrial-strength integrated development environment (IDE),suitable for use by professional programmers.The installer configures your user preferences to make itmore suitable for use by novice programmers:Disables all built-in plugins except Terminal and JUnit. Installs the SpotBugs, Checkstyle-IDEA, Run-with-Arguments, Save-Actions, and Archive browser plugins.
Eliminates or reduces various popup elements (lightbulbs, code folding, breadcrumbs, gutter markers, notifications, parameter hints).
Simplifies menus and toolbars, hiding advanced options.
Disables live templates and postfix completion.
Adopts the Obsidian Black color scheme.
Auto-configures Java upon installation.
Adds a few keyboard shortcuts.
The course-specific project folders perform additional customizations:
Streamlines autocomplete to display only relevant libraries(such as java.lang,java.util, and algs4.jar).
Configures SpotBugs and Checkstyle with course-specific rules.
Provides course-specific libraries (such as algs4.jar).
Enables auto-formatting of code on save.
Enables auto-importing of Java libraries.
How can I manually configure the Platform SDK and Project SDK in IntelliJ?The installer should configure the Platform SDK automatically.To configure it manually, Navigate to File → Project Structure → Platform Settings → SDKs.
 Click the + symbol (top left) to add an SDK.
 Locate an SDK. A typical location for a Java SDK onMac OS X is /Library/Java/JavaVirtualMachines/adoptopenjdk-11.jdk/Contents/Home/.
 Use the shorthand name suggested by IntelliJ(e.g., 11 for version 11.0.7).
To manually configure the Project SDK,
 Navigate to File → Project Structure → Project Settings → Project.
 Choose the desired Project SDK from the drop-down list.
 Be sure to use 8 as the Project language level, as our autogradercurrently supports only Java 8 features.
What are the most important IntelliJ menu options to remember?Here are the most important ones (and their shortcuts).LIFT → New Java Class (⌘N). Create a new Java class.
LIFT → Recompile (⌘B). Compile the current program.
LIFT → Run with Arguments (⌘E). Run the current program with command-line arguments.
LIFT → Open in Terminal (⌘T). Open a new Terminal tab.
File → Save All (⌘S). Save (and reformat) all open files.
View → Tool Windows → Project (⌘1). Show/hide the Project View sidebar.
View → Tool Windows → Terminal (⌘2). Show/hide the Terminal window.
Any special characters to avoid when naming IntelliJ projects or files?Do not use an exclamation point (!) as the last characterin the project folder (or any directory name along the path to your project folder);that will confuse both IntelliJ and Checkstyle.How can I create a new project in IntelliJ?If you want to inherit all of the properties of an existing project, Use the Finder to copy the project folder,giving it your preferred name. 
 Delete any unwanted files.
 Be sure to keepthe .iml file (which defines the project),the .idea subdirectory (which containsthe IntelliJ course preferences), andthe .lift subdirectory (which contains the courselibraries).
To create a new project from scratch, you can use the Create New Project option from theWelcome screen. But, we do not recommend this approach for novice programmers.
Can I use a version of IntelliJ that is more recent than 2020.1.1?Yes, though if it is 2020.2 (or above),you will need to migrate your user preferences.How I can I restore the original IntelliJ settings(instead of the abbreviated novice-friendly ones)?To restore the menus and toolbars: Preferences → Appearances & Behavior → Menus and Toolbars → Restore All Defaults.
To restore all settings: Help → Find Action → Restore Default Settings.
Command-Line / Embedded Terminal FAQ
When I compile or execute a program from the command line that uses one of thetextbook libraries, I get an error that it cannot find the library. How can I fix this?Make sure that you are using the appropriate wrapper script,such as javac-algs4or java-algs4.How should I configure Bash?If you followed our instructions, our wrapper scripts (such asjavac-algs4 andjava-algs4)should already be available.Our autoinstaller customizes the command line in a few ways by copying these three configuration files:.bashrc,.bash_profile, and.inputrc.Note that the autoinstaller will copy these files only if none of them already exists.If you had previous versions and wish to replace your versions with ours, type the following commands:
How do I break out of a program in an infinite loop?Type Ctrl-C.How do I specify EOF to signal that standard input is empty?On Mac OS X and Linux, type EnterCtrl-D.On Windows, type EnterCtrl-ZEnter,even in Git Bash.How can I run SpotBugs, PMD, and Checkstyle from the command line?The installer includes wrapper scripts to simplify this process. To run SpotBugs 4.0.3, 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 6.15.0, type the following command in the terminal:The argument must be either a single .java file ora directory containing one or more .java files.Here is a list of bug patterns.
 To run Checkstyle 8.31, type one ofthe following commands in the terminal, depending on whether you are COS 126, COS 226, or Coursera student:The argument must be a list of .java files.Here is a list ofavailable checks.