import java.lang.management.ManagementFactory;
import java.lang.management.RuntimeMXBean;
import javax.management.MBeanServer;
import javax.management.ObjectName;
/**
 * 不同平台和版本下，Mbeans名字不一样。本例为win32+jdk 7_b07
public class MBeanAccess {
    public static void main(String[] args) throws Exception {
        //打印GC次数
        MBeanServer mbs = ManagementFactory.getPlatformMBeanServer();
        ObjectName youngMBean = new ObjectName("java.lang:type=GarbageCollector,name=MarkSweepCompact");
        ObjectName tenuredMBean = new ObjectName("java.lang:type=GarbageCollector,name=Copy");
        System.out.println("YGC:" + mbs.getAttribute(youngMBean, "CollectionCount"));
        System.out.println("FGC:" + mbs.getAttribute(tenuredMBean, "CollectionCount"));
        System.gc();
        System.out.println("YGC:" + mbs.getAttribute(youngMBean, "CollectionCount"));
        System.out.println("FGC:" + mbs.getAttribute(tenuredMBean, "CollectionCount"));
        int pid = getPid();  
        System.out.println("pid: " + pid);  
        //System.in.read(); // block the program so that we can do some probing on it  
    }
     
    private static int getPid() { 
        //获取进程的PID
        RuntimeMXBean runtime = ManagementFactory.getRuntimeMXBean();  
        String name = runtime.getName(); // format: "pid@hostname"  
        try {  
            return Integer.parseInt(name.substring(0, name.indexOf('@')));  
        } catch (Exception e) {  
            return -1;  
        }  
    }  
}