(Creating Custom Exception Class) Write a Password class that stores a password string. Passwords must contain at least seven alpha-numeric characters, with at least one letter and one digit. Also write an InvalidPasswordException class that extends Exception. The Password constructor should throw an InvalidPasswordException, which should report an appropriate message based on a given string (e.g. if the string contains no digits, the exception should report this fact). Write a GUI program to prompt the user to enter a password and report an InvalidPasswordException if an invalid password is entered. Please teach and help me how to deisgn the program based on the two files given .Some sample screenshots are shown below:

Computer Networking: A Top-Down Approach (7th Edition)
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Author:James Kurose, Keith Ross
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(Creating Custom Exception Class) Write a Password class that stores a password string. Passwords must contain at least seven alpha-numeric characters, with at least one letter and one digit. Also write an InvalidPasswordException class that extends Exception. The  Password constructor should throw an InvalidPasswordException, which should report an appropriate message based on a given string (e.g. if the string contains no digits, the exception should report this fact). 
 
Write a GUI program to prompt the user to enter a password and report an InvalidPasswordException if an invalid password is entered. Please teach and help me how to deisgn the program based on the two files given .Some sample screenshots are shown below:

InvalidPasswordException.java

public class InvalidPasswordException extends Exception{
    public InvalidPasswordException (String errMsg){
        super(errMsg);
    }
    
}

 

Password.java

public class Password  {
private String passwordstr;
    

  public Password (String passwordstr) throws InvalidPasswordException {
          if (passwordstr== null ||passwordstr.equals("")) {
          throw new InvalidPasswordException("Invalid password: password cannot be null or an empty string.");
      } else {
                int countDigits=0;

                int countLetters=0;
                
    for (int i=0; i<passwordstr.length();++i)
              
{
              char ch = passwordstr.charAt(i);
              if (Character.isDigit(ch))
                  
                            countDigits++;

              else if (Character.isLetter(ch)) 
                  
                            countLetters++;

          }
                       
                            int countAlphaNumeric =countDigits + countLetters;
          String errMsg = "";
          if (countDigits == 0)
          errMsg += "Your password should have at least 1 digit.\n";


                
          if (countLetters==0)    
                errMsg += "Your password should have at least 1 digit.\n";


                
                       if(countAlphaNumeric <7)
          errMsg += "Your password should have at least 7 alpha-numeric character.\n";      

    
          if (!errMsg.equals(""))
              throw new InvalidPasswordException(errMsg);
      }
                this.passwordstr=passwordstr;
    
  }
}

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