用java取得linux系统cpu、内存的实时信息

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.StringTokenizer;

/**
* 取得linux系统下的cpu、内存信息
*
* <p>@author javer QQ:84831612</p>
* @date 2005
*/
public final class LinuxSystemTool
{
   /**
   * get memory by used info
   *
   * @return int result
   * result.length==4;int[0]=MemTotal;int=MemFree;int=SwapTotal;int=SwapFree;
   * @throws IOException
   * @throws InterruptedException
   */
   public static int getMemInfo() throws IOException, InterruptedException
   {
      File file = new File("/proc/meminfo");
      BufferedReader br = new BufferedReader(new InputStreamReader(
      new FileInputStream(file)));
      int result = new int;
      String str = null;
      StringTokenizer token = null;
      while((str = br.readLine()) != null)
      {
         token = new StringTokenizer(str);
         if(!token.hasMoreTokens())
            continue;
   
         str = token.nextToken();
         if(!token.hasMoreTokens())
            continue;
   
         if(str.equalsIgnoreCase("MemTotal:"))
            result[0] = Integer.parseInt(token.nextToken());
         else if(str.equalsIgnoreCase("MemFree:"))
            result = Integer.parseInt(token.nextToken());
         else if(str.equalsIgnoreCase("SwapTotal:"))
            result = Integer.parseInt(token.nextToken());
         else if(str.equalsIgnoreCase("SwapFree:"))
            result = Integer.parseInt(token.nextToken());
      }
   
      return result;
   }

   /**
   * get memory by used info
   *
   * @return float efficiency
   * @throws IOException