package iso;

import java.util.Random;

public class Test5 {

 /**   * 产生随机数  

*   * @param randomLength  

* @return  

*/  

public static String randomChars(int randomLength) {

  char[] randoms = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9' };

  Random random = new Random();

  StringBuffer ret = new StringBuffer();

  for (int i = 0; i < randomLength; i++) {

   ret.append(randoms[random.nextInt(randoms.length)]);  

 }   

random = null;  

 return ret.toString();

 }

 public static void main(String[] args) {  

 Test5 t5 = new Test5();

  System.out.println(t5.randomChars(1));

    }

}