Java Script: I am in need of it for research items

I am always needing to download updated versions of java script, it seems.  It also seems that this is a backdoor way to infect a computer with a virus.  I conduct a lot of research on my computer and articles run on java.  I recently upgraded my mac's operating system and java script also needs to be upgraded (so I am prompted to update it).  But, I recently read that hackers will prompt you into thinking you need to update a java script so that it can infect your computer.  How do I trust a java script update prompt?  I updated to OS X Yosemite, is it true that Java Script has been disabled by this operating software system?  If so, is it best to visit oracle to update java?  Should I delete all previous versions of java first and then visit oracle and then update?  Please advise on how to proceed.  Many thanks in advance.

That's different. You have software on your Mac that requires Java to function. This is completely independent of your web browser, so has nothing to do with that. There's various software like that. Some being Adobe's apps, X-Rite's ColorPort app, ROES software for ordering photo prints from your digital files, and others.
All it's telling you is an app you want to run is missing the Java runtime software it needs on your Mac. There are a couple of ways to do this.
1) Download and install Java 6 SE for Mac. Version 6 was the last version Apple produced before turning over all future Java development to Oracle. This will typically fix the error.
2) You can also install Java 8 from Oracle. If you do go this route, pay very close attention to the installer. It wants to install adware along with Java. Make sure to turn the check box off to prevent that. This alone won't fix the issue since the apps are looking for version 6 of Java. Once Java 8 is installed, open the System Preferences and click on the Java icon. Click on the Security tab of the dialogue that appears and turn off the top check box. This will prevent Java from working in your web browsers, which will stop any such exploits via the web from running.
Now that you've disabled Java 8 for the web, time to get Java 8 working for apps looking for version 6. Open the Terminal app in the /Applications/Utilities/ folder and enter the two lines below in Terminal, pressing return after each one. To make sure you don't type something wrong, copy/paste the lines from here one at at time into the Terminal window. If you've never used the sudo command before, it will give you a generic warning about using the command. Then enter your admin password to allow the command to complete.
sudo mkdir -p /System/Library/Java/JavaVirtualMachines/1.6.0.jdk
sudo mkdir -p /System/Library/Java/Support/Deploy.bundle
There's no need to follow all of these steps for number 2 if you have no need for Java 8. I need it for ROES software, but I also need version 6 for ColorPort. By following these longer steps, I only need to install version 8. The Terminal lines trick ColorPort into using version 8 as 6. That way, I don't have to install both 6 and 8.

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