By Paul Gorski Do I need Java on my computer? Most likely not. Java is a programming language that is used to develop programs that run on Windows, Mac and Linux computers or may be integrated into websites. From: “Java allows you to play online games, chat with people around the world, calculate your mortgage interest, and view images in 3D, just to name a few. It’s also integral to the intranet applications and other e-business solutions that are the foundation of corporate computing.” That said, Java can be a security threat, and if you do not need Java, do not install it on your personal computer. If Java is not installed and you come across a website or program that requires it, you will be prompted to install it at that time. I suggest that you only install Java from the official website. When installing Java, set it to automatically update. Since Java runs on PCs and Macs, hackers can write Java programs that can infect most every computer surfing the Internet today. Keeping Java current and patched is critical to computer security. Visit if you want to know whether or not Java is installed on your computer. If it is installed, do not uninstall it, just keep it updated. The same testing site will you let you know if you need to update Java. If you are a corporate decision maker and your IT consultant recommends a Java-based server solution, do not be overly concerned. I have one computer that I intentionally installed JDK on. I have another computer with JRE, for, among other things, testing. However, when I got a java application working on this computer, and then tried it on another, it complained that JDK was required. If installed. The installer would automatically set the path of JAVA_HOME. So you can check if its there or not by just opening a command prompt and type 'java -version'. It would show the version of java if installed. If java is copied by unzipping a zip file, and you forgot where you did that, then you need to search for javac.exe / java.exe in the whole file system. Occasionally I get a prompt to update Oracle Java on my computer with. In the early days of JAVA, the installation of applications automatically installed JAVA at the. So, how do you know if your applications require JAVA? He doesn't think that it's necessary to uninstall Java to keep your computer secure. Instead, Baumgartner said, we're best off remembering to keep on top of those Java alerts to upgrade. You should skip the first step if Java is already installed on your machine. [ In Vista, select Start -> My Computer -> Properties -> Advanced. To check that you have the right version of Java installed, type the text in boldface below. Java is extremely popular, and relatively safe, when deployed on servers. I believe it is still the most popular programming language. My security concerns relate only to the installation of Java on desktop computers. Again, if you need Java installed, install it from and keep it updated. Please note there is a similarly-named browser technology: Javascript. How To Check If Java Is InstalledJavascript is not related to Java and you most likely do need Javascript enabled. Paul Gorski ( ) has been a technology manager nearly 20 years, specializing in workflow solutions for printing, publishing and advertising computer users. Originally destined to be a chemist, his interest in computers began in college when he wrote a program to analyze data from lab instruments he hard-wired to the back of an Apple IIe. How To Know If Java Is Installed On Your ComputerHow can I find which version of Java is installed without running an applet in Windows or Mac? This article applies to: • Platform(s): Mac OS X, Windows 10, Windows 7, Windows 8, Windows Vista, Windows XP, macOS • Java version(s): 7.0, 8.0 The Java version can be found: • • (Windows and Mac) • • (Mac) Use any of these options if you are having trouble running applets to confirm that you have a specific Java version. Starting with Java 7 Update 40, you can find the Java version through the Windows Start menu. • Launch the Windows Start menu • Click on Programs • Find the Java program listing • Click About Java to see the Java version The Java version can be found in the Java Control Panel. • • Under the General tab in the Java Control Panel, the version is available through the About section. A dialog appears (after clicking About) showing the Java version. The latest version(s) of Java on your system will be listed as Java 8 with an associated Update number (eg. Java 8 Update 111). Older versions may be listed as Java(TM), Java Runtime Environment, Java SE, J2SE or Java 2. Windows 10 • Click the Start button • Scroll through the applications and programs listed until you see the Java folder • Click on the Java folder, then About Java to see the Java version Windows 8 • Right-click on the screen at bottom-left corner and choose the Control Panel from the pop-up menu. • When the Control Panel appears, select Programs • Click Programs and Features • The installed Java version(s) are listed. Windows 7 and Vista • Click Start • Select Control Panel • Select Programs • Click Programs and Features • The installed Java version(s) are listed. Windows XP • Click Start • Select Control Panel • Click the Add/Remove Programs control panel icon • The Add/Remove control panel displays a list of software on your system, including any Java versions that are on your computer. MORE TECHNICAL INFORMATION The Java Runtime (JRE) that you download from java.com or oracle.com contains a plugin to run Java content from your browser. In order to use the command line tools, you will need to download the Java Development Kit (JDK). The JRE and JDK are separate and can coexist on your system. Only one JRE can be installed on Mac. Where Is My Java InstalledHow To Check If Java Is Installed On Your ComputerThere can be multiple JDKs installed on a system, as many as you wish. JRE Version Command Line on Mac Type the following in a Terminal window: /Library/Internet Plug-Ins/JavaAppletPlugin.plugin/Contents/Home/bin/java -version Determining the Default Version of the JDK on Mac When launching a Java application through the command line, the system uses the default JDK. It is possible for the version of the JRE to be different than the version of the JDK. You can determine which version of the JDK is the default by typing java -version in a Terminal window. If the installed version is 7u55, you will see a string that includes the text 1.7.0_55. For example: java -version java version '1.7.0_55' Java(TM) SE Runtime Environment (build 1.7.0_55-b13) Java HotSpot(TM) 64-Bit Server VM (build 24.55-b03, mixed mode).
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