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 Runtime.getRuntime().exec(command)
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 Runtime.getRuntime().exec("ls");
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 µ÷ÓÃRuntime.exec·½·¨½«²úÉúÒ»¸ö±¾µØµÄ½ø³Ì,²¢·µ»ØÒ»¸öProcess×ÓÀàµÄʵÀý£¬
£¨×¢Ò⣺Runtime.getRuntime().exec£¨command£©·µ»ØµÄÊÇÒ»¸öProcessÀàµÄʵÀý£©,
¸ÃʵÀý¿ÉÓÃÓÚ¿ØÖƽø³Ì»òÈ¡µÃ½ø³ÌµÄÏà¹ØÐÅÏ¢. ÓÉÓÚµ÷ÓÃRuntime.exec·½·¨Ëù´´½¨µÄ×Ó½ø³ÌûÓÐ×Ô¼ºµÄÖÕ¶Ë»ò¿ØÖÆÌ¨,Òò´Ë¸Ã×Ó½ø³ÌµÄ±ê×¼IO(Èçstdin,stdou,stderr)¶¼Í¨¹ýProcess.getOutputStream(),Process.getInputStream(), Process.getErrorStream()·½·¨Öض¨Ïò¸øËüµÄ¸¸½ø³ÌÁË.Óû§ÐèÒªÓÃÕâЩstreamÀ´Ïò×Ó½ø³ÌÊäÈëÊý¾Ý»ò»ñÈ¡×Ó½ø³ÌµÄÊä³ö. ¿ÉÒÔ²ÉÓÃÈçÏ·½·¨£º
public static void main(String[] agrs){
try
{
 Process process = Runtime.getRuntime().exec ("ls"); 
 InputStreamReader ir=newInputStreamReader(process.getInputStream());
 LineNumberReader input = new LineNumberReader (ir);
 String line;
 while ((line = input.readLine ()) != null){
  System.out.println(line)
}
}catch (java.io.IOException e){
 System.err.println ("IOException " + e.getMessage());
}
}


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package homework01;
public class TestWhile {

public static double factorial(int n) //Çó½×³Ëº¯Êý
{
if(n==0) return 1;
else return n* factorial(n-1);
}

public static void main(String[] args) {
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typedef int (read_proc_t)(char *page, char **start, off_t offset, int count, int *eof, void *data);
read_proc_t *proc_read;
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