public class RandomString {              public static String randomstring(int lo, int hi){                    int n = rand(lo, hi);                    byte b[] = new byte[n];                    for (int i = 0; i < n; i++)                            b[i] = (byte)rand('a', 'z');                    return new String(b, 0);            }              private static int rand(int lo, int hi){                        java.util.Random rn = new java.util.Random();                    int n = hi - lo + 1;                    int i = rn.nextInt(n);                    if (i < 0)                            i = -i;                    return lo + i;            }              public static String randomstring(){                    return randomstring(5, 25);            }            /**           * @param args           */          public static void main(String[] args) {                  System.out.println(randomstring());            }    }