(Practically speaking, getting something to work across platforms is rarely easy.) The JVM handles memory management and anything else that the application needs, and runs it inside a sandbox that isolates the Java application from your operating system. Theoretically, a developer can write a Java program to run inside the virtual machine, and it will run without modification on any platform-Mac, Windows, Linux, or whatever is running a valid JVM. That means that Java applications are designed to run inside a Java Virtual Machine installed on your Mac. It’s a complete application runtime environment. (I also have some advice on isolating Flash.) If you plan to keep Java, make sure that you update it as soon as possible. But I can’t overstate the risk: Nearly all recent Mac malware attacks rely on exploiting Java or Flash in your Web browser. Removing Java will be problematic for some people, especially those who use Macs at work and isolating it isn’t simple. I don’t make this recommendation lightly.
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