一、方法一
java -XX:+PrintCommandLineFlags -version
二、方法二
java -XX:+PrintFlagsFinal -version | grep
三、方法三
import java.lang.management.GarbageCollectorMXBean; import java.lang.management.ManagementFactory; import java.util.List; public class x { public static void main(String args[]) { List<GarbageCollectorMXBean> l = ManagementFactory.getGarbageCollectorMXBeans(); for(GarbageCollectorMXBean b : l) { System.out.println(b.getName()); } }
PS MarkSweep (enabled with -XX:+UseParallelOldGC)
the parallel scavenge mark-sweep collector, parallelised version (i.e. uses multiple threads) of the MarkSweepCompact.