Downloads and installsPMD 5.8.1from our PMD configuration file pmd.xmland wrapper script pmd-introcs. Downloads and installsFindbugs 3.0.1from our findbugs configuration file findbugs.xml and wrapper script findbugs-introcs. Downloads the Java wrapper scriptsjavac-introcs andjava-introcs. Downloads the textbook standard libraries fromstdlib.jar. 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: Security and Privacy -> General -> Allow applications downloaded from: Anywhere. Download introcs.zip to the Desktop double-click it to unzip (if necessary). 
Double click the downloaded file jdk-8u171-macosx-圆4.dmg to begin the installation.Enter your OS X password when prompted.We recommend all of the default options. Browse toJava SE Development Kit 8u171.In the first table, check Accept License Agreementand the click jdk-8u171-macosx-圆4.dmg,which corresponds to the entry for Mac OS X.The exact verison 8u171 is not essential. 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. 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. 
Our installer downloads, installs, and configures the Java programming environment you will be using, including DrJava, and the standard libraries from our textbook.
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