如何在JMX中使用getSystemCpuLoad()

ManagementFactory. getOperatingSystemMXBean().getProcessCpuTime();

也是这样的

( (OperatingSystemMXBean) getOperatingSystemMXBean() ).getProcessCpuTime()

但是找不到像方法getProcessCpuTime()那样的显示错误.我包括以下头文件.这还不够,或者我需要再使用了.？

import java.lang.management.ManagementFactory;
import java.lang.management.OperatingSystemMXBean;

任何人都可以建议我如何使用这些方法.我正在使用jdk1.6.我的代码如下

import java.lang.management.ManagementFactory;
import java.lang.management.OperatingSystemMXBean;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;

public class printUsage {

public static void main(String[] args) {
OperatingSystemMXBean operatingSystemMXBean = ManagementFactory.getOperatingSystemMXBean();

System.out.println("getCpuProcessTime()" + " = " + operatingSystemMXBean.getProcessCpuTime());
System.out.println("getCpuProcessTime()" + " = " + operatingSystemMXBean.getSystemCpuLoad());
System.out.println("getCpuProcessTime()" + " = " + operatingSystemMXBean.getProcessCpuLoad());
}

}