Java Programs Made Easy

Q)...validate a password 
i) there should be atleast one digit
ii) there should be atleast one of '#','@' or '$' .
iii)the password should be of 6 to 20 characters
iv) there should be more uppercase letter than lower case.
v) should start with an upper case and end with lower case
 

1. package Set1;
2. import java.util.*;
3. public class ClassSet33 {
4. public static void main(String[] args) {
5.   Scanner s=new Scanner(System.in);
6.   String st=s.next();
7.   boolean b=validatingPassword(st);
8.   if(b==true)
9.    System.out.println("valid password");
10.   else
11.    System.out.println("Invalid Password");
12.  }
13. public static boolean validatingPassword(String st) {
14.  boolean b1=false,b2=false;
15.  if(Character.isUpperCase(st.charAt(0)))
16.   if(Character.isLowerCase(st.charAt(st.length()-1)))
17.    if(st.length()>=6 && st.length()<=20)
18.     for (int i = 0; i < st.length();i++)   
19.        {   char c = st.charAt(i);   
20.            if(Character.isDigit(c)){   
21.              b1=true; break; }     }
22.  int x=0,y=0;
23.  for(int i = 0; i < st.length(); i++)
24.        if(Character.isUpperCase(st.charAt(i)))
25.          x++;
26.        else if(Character.isLowerCase(st.charAt(i)))
27.       y++;
28.  if(b1==true)
29.   if(x>y)
30.    for (int i = 0; i < st.length();i++)   
31.       {   char c = st.charAt(i);   
32.           if(c=='#' || c=='@' || c=='$'){   
33.             b2=true; break; }     }
34.  return b2;
35. }
36. }