Print GCMbeans

GCMBean.java

import java.lang.management.GarbageCollectorMXBean;
import java.lang.management.ManagementFactory;
import java.util.Arrays;
import java.util.List;

// for x in '' -XX:+UseConcMarkSweepGC -XX:+UseParallelGC -XX:+UseParNewGC; do echo opt:$x; java $x GCMBean; done
public class GCMBean {
    public static void main(String[] args) throws Exception {
        List<GarbageCollectorMXBean> gcbeans = ManagementFactory.getGarbageCollectorMXBeans();
        // printGCBeans(gcbeans);
        printGCBeans(Arrays.asList(markSweepGCBean(gcbeans)));
    }

    private static void printGCBeans(Iterable<GarbageCollectorMXBean> gcbeans) {
        for (GarbageCollectorMXBean gcbean : gcbeans) {
            System.out.println(gcbean.getName());
            System.out.println(Arrays.toString(gcbean.getMemoryPoolNames()));
            System.out.println();
        }
    }

    private static GarbageCollectorMXBean markSweepGCBean(Iterable<GarbageCollectorMXBean> gcbeans) {
        for (GarbageCollectorMXBean gcbean : gcbeans) {
            if (gcbean.getName().indexOf("MarkSweep") >= 0) {
                return gcbean;
            }
        }
        return null;
    }
}

$ javac GCMBean.java && for x in '' -XX:+UseConcMarkSweepGC -XX:+UseParallelGC -XX:+UseParNewGC; do echo opt:$x; java $x GCMBean; done
opt:
PS MarkSweep
[PS Eden Space, PS Survivor Space, PS Old Gen, PS Perm Gen]

opt:-XX:+UseConcMarkSweepGC
ConcurrentMarkSweep
[Par Eden Space, Par Survivor Space, CMS Old Gen, CMS Perm Gen]

opt:-XX:+UseParallelGC
PS MarkSweep
[PS Eden Space, PS Survivor Space, PS Old Gen, PS Perm Gen]

opt:-XX:+UseParNewGC
MarkSweepCompact
[Par Eden Space, Par Survivor Space, Tenured Gen, Perm Gen]