Generate dynamic password in java with varying length

1:  package test; 
2:  import java.util.Random; 
3:  /** 
4:   * @author SALPE NEELESH  
5:   * 
6:   */ 
7:  public class TestClass { 
8:       private static final char[] alphaNumericChars = { 'A', 'B', 'C', 'D', 'E', 
9:                 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 
10:                 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 
11:                 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 
12:                 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', '0', '1', '2', '3', '4', 
13:                 '5', '6', '7', '8', '9' }; 
14:       private static final int MIN_LENGTH = 8; 
15:       private static final int MAX_LENGTH = 11; 
16:       public static synchronized String generatePassword() { 
17:            Random random = new Random(); 
18:            int lengthOfpassword = MIN_LENGTH 
19:                      + random.nextInt((MAX_LENGTH - MIN_LENGTH) + 1); 
20:            StringBuffer sb = new StringBuffer(); 
21:            for (int i = 0; i < lengthOfpassword; i++) { 
22:                 sb.append(alphaNumericChars[random 
23:                           .nextInt(alphaNumericChars.length)]); 
24:            } 
25:            return sb.toString(); 
26:       } 
27:       public static void main(String[] args) { 
28:            for (int i = 0; i < 10; i++) { 
29:                 generatePassword(); 
30:            } 
31:       } 
32:  }