packagetest.lyh.test; importcom.alibaba.fastjson.JSON; importcom.alibaba.fastjson.JSONObject; importjava.lang.management.ManagementFactory; importjava.lang.management.OperatingSystemMXBean; importjava.math.BigDecimal; importjava.math.RoundingMode; publicclassSystemUsage{ publicstaticvoidmain(Str...