Answered: (Creating Custom Exception Class) Write…

Computer Networking: A Top-Down Approach (7th Edition)

7th Edition

ISBN:9780133594140

Author:James Kurose, Keith Ross

Publisher:James Kurose, Keith Ross

Chapter1: Computer Networks And The Internet

Section: Chapter Questions

Problem R1RQ: What is the difference between a host and an end system? List several different types of end...

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Question

Q1 (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;

}
}