JAVA-JVM tuning flags

JVM tuning flags: With few exceptions, the major JVM acceptance logo Class 2 logo, and comes with a Boolean flag parameter

　　Boolean flag uses the following syntax: -XX: + FlagName indicate on -XX: -FlagName means closed

　　It appears with the following parameters far: -XX: FlagName = something (flagname shows a set value to something, which may generally be any sonmething value)