java启用多进程调用某个类(是class文件)

import java.io.BufferedInputStream;
import java.io.BufferedReader;
import java.io.File;
import java.io.IOException;
import java.io.InputStreamReader;
import java.lang.management.ManagementFactory;
import java.lang.management.RuntimeMXBean;


public class MultipleProcessorAccess {
  
  private static int processorCount = 5;//5
  
  public static void main(String[] args) {
    for (int i = 0; i < processorCount; i++) {
      ProcessBuilder pb = new ProcessBuilder("java",
          "PnSnapshotPerformanceTest");//d20130306.UseJConsole
      pb.directory(new File("C:/Users/yfan/Desktop/multipleTest"));
      BufferedInputStream in = null;
      BufferedReader br = null;
      try {
        Process p = pb.start();
        
        //returnCurrentProcessId();

        // if wait the stream from server, 
        // when one processor end can start next processor, 
        // not multiple processor
        /*in = new BufferedInputStream(p.getInputStream());
        br = new BufferedReader(new InputStreamReader(in));
        String s;
        while ((s = br.readLine()) != null) {
          System.out.println(s);
        }*/
      } catch (IOException e) {
        e.printStackTrace();
      } finally {
        if (br != null) {
          try {
            br.close();
          } catch (IOException e) {}
        }
        if (in != null) {
          try {
            in.close();
          } catch (IOException e) {}
        }
      }
    }
  }
  
  private static int returnCurrentProcessId() {
    RuntimeMXBean runtime = ManagementFactory.getRuntimeMXBean();
    String name = runtime.getName();
    int pid = Integer.parseInt(name.substring(0, name.indexOf("@")));
    System.out.println("current process id: " + pid);
    return pid;
  }
}