java vm options having + and - symbols -


what "+" , "-" sign refer in vm options

java -xx:+useparallelgc -xx:-useparalleloldgc testgc java -xx:+useconcmarksweepgc -xx:+explicitgcinvokesconcurrent -xx:-useparnewgc  testgc

we can see "+useparallelgc" , "-useparalleloldgc" having + , - sign, these signify

directly documentation:

boolean options turned on -xx:+<option> , turned off -xx:-<option>

please note + option on , - option off


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