@Override
    public long getFullGCCollectionTime() {
        if (fullGC == null) {
            return 0;
        }
        return fullGC.getCollectionTime();
    }
@author Robert HG (254963746@qq.com) on 9/15/15.
lts-core/src/main/java/com/github/ltsopensource/jvmmonitor/mbean/JVMGC.java