JDK default garbage collector
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Java
jdk1. 7. The default garbage collector is parallel scavenge (new generation) + parallel old (old age).
jdk1. 8. The default garbage collector is parallel scavenge (new generation) + parallel old (old age).
jdk1. 9 default garbage collector G1.
-20: The + printcommandlineflagsjvm parameter allows you to view the default collector type.
-20: + printgcdetails can also be judged by the names of the new generation and old age of the printed GC log.
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