Question

Design and implement a Java program (name it PasswordTest) that accepts a string from the user and evaluates it as a password, giving it a valid or invalid verdict A good password will be at least 8 characters and includes at least one lower-case letter, at least one upper-case letter, at least one digit, and at least one character that is neither a letter nor a digit. Your program will need to check each character in the string in order to render a verdict. For example, CS1301/99 is invalid password. The program should display the entered password and the program's Judgment on it. For example, Entered Password: CS1301/99 Verdict: Invalid Document your code, and organize and space out your outputs as shown.

Answer 1

PasswordTest.java

import java.util.Scanner;

public class PasswordTest {

  
   public static void main(String[] args) {
       Scanner scan = new Scanner(System.in);
       System.out.println("Enter password: ");
       String password = scan.next();
       boolean status = false;
       int lowerLetterCount = 0;
       int upperLetterCount = 0;
       int digitCount = 0;
       int otherLetterCount = 0;
      
       if(password.length() >= 8){
       for(int i=0; i<password.length(); i++){
           char ch = password.charAt(i);
          
           if(ch >= 'a' && ch <= 'z'){
               lowerLetterCount++;
           }
           else if(ch >= 'A' && ch <= 'Z'){
               upperLetterCount++;
           }
           else if(ch >= '1' && ch <= '9'){
               digitCount++;
           }
           else{
               otherLetterCount++;
           }
       }
       }
       if(lowerLetterCount > 0 && upperLetterCount > 0 && digitCount > 0 && otherLetterCount > 0){
           status = true;
       }
       String s = "";
       if(status){
           s = "Valid";
       }else{
           s = "Invalid";
       }
       System.out.println("Entered Password: "+password );
       System.out.println("Verdict: "+s);

   }

}

Output:

Enter password:
CS1301/99
Entered Password: CS1301/99
Verdict: Invalid