监测JVM

    private static void getOS() {
       OperatingSystemMXBean osMXBean = ManagementFactory.getOperatingSystemMXBean();

        for (Method method : osMXBean.getClass().getDeclaredMethods()) {
            method.setAccessible(true);
            if (method.getName().startsWith("get") && Modifier.isPublic(method.getModifiers())) {
                Object value;
                try {
                    value = method.invoke(osMXBean);
                } catch (Exception e) {
                    value = e;
                } // try
                System.out.println(method.getName() + " = " + value);
            } // if
        } // for
    }


    private static void getClassLoad() {
       ClassLoadingMXBean osMXBean = ManagementFactory.getClassLoadingMXBean();

        for (Method method : osMXBean.getClass().getDeclaredMethods()) {
            method.setAccessible(true);
            if (method.getName().startsWith("get") && Modifier.isPublic(method.getModifiers())) {
                Object value;
                try {
                    value = method.invoke(osMXBean);
                } catch (Exception e) {
                    value = e;
                } // try
                System.out.println(method.getName() + " = " + value);
            } // if
        } // for
    }