@Override
    public String getPID() {
        if (null == pid) {
            pid = runtimeMXBean.getName().split("@")[0];
        }
        return pid;
    }
@author Robert HG (254963746@qq.com) on 9/15/15.
lts-core/src/main/java/com/github/ltsopensource/jvmmonitor/mbean/JVMInfo.java