Write the Java source code necessary to build a solution using the \"matches\" m
ID: 3675500 • Letter: W
Question
Write the Java source code necessary to build a solution using the "matches" method. needs to be able to:
(Check password) Some websites impose certain rules for passwords.Write a method that checks whether a string is a valid password. Suppose the password rules are as follows:
A password must have at least eight characters .
A password consists of only letters and digits.
A password must contain at least two digits.
Write a java program that prompts the user to enter a password and displays Valid Password if the rules are followed or Invalid Password otherwise.
Explanation / Answer
import java.util.Scanner;
public class ProgrammingExercise {
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
System.out.print("Enter a password: ");
String s = input.nextLine();
if (chkPswd(s)) {
System.out.println("Valid Password");
} else {
System.out.println("Invalid Password");
}
}
public static boolean chkPswd(String password) {
boolean chkPswd = true;
// A password must have at least eight characters.
if (password.length() < 8) {
chkPswd = false;
} else { // A password consists of only letters and digits.
int numberOfDigit = 0;
for (int i = 0; i < password.length(); i++) {
if (isDigit(password.charAt(i)) || isLetter(password.charAt(i))) {
if (isDigit(password.charAt(i))) {
numberOfDigit++;
}
} else { // if a char in the password is not a letter or a
// digit, set chkPswd to false and break of for loop
chkPswd = false;
break;
}
}
if (numberOfDigit < 2) { // A password must contain at least two
// digits.
chkPswd = false;
}
}
return chkPswd;
}
public static boolean isLetter(char ch) {
return ((ch <= 'z' && ch >= 'a') || (ch <= 'Z' && ch >= 'A'));
}
public static boolean isDigit(char ch) {
return (ch <= '9' && ch >= '0');
}
}
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