Java was originally developed by James Gosling at Sun Microsystems (which has since been acquired by Oracle) and released in 1995 as a core component of Sun Microsystems' Java platform
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Control knobs are a simpler type of input hardware and one of the most common components in control systems, and are found on all sorts of devices from taps and gas stoves to optical microscopes, potentiometers and radio tuners.
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In classification problems, the primary source for accuracy estimation is the confusion matrix (or classification matrix or contingency table)
It could be that your computer is simply getting older and more worn out, I suggest downloading MalwareBytes, it's a free anti-virus software that I use personally.