06 (Java) Check whether a string is a valid password.java

package BasicCode;

import java.util.Scanner;

public class BasicCode {
    public static final int PASSWORD_LENGTH = 8;

    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);
        
        System.out.print(
                "1. A password must have at least eight characters.\n" +
                "2. A password must contain at least two digits \n" +
                "------ ------ ------ ------ ------ ------ \n"+
                "Enter a password: ");
        String s = input.nextLine();

        if(is_Valid_Password(s)){
            System.out.println("Password is valid: " + s);
        }
        else{
            System.out.println("Not a valid password: " + s);
        }
    }

    public static boolean is_Valid_Password(String password){

        if (password.length() < PASSWORD_LENGTH){
            return false;
        }

        int charCount = 0;
        int numCount = 0;
        
        for (int i = 0; i < password.length(); i++){
            char ch = password.charAt(i);
            if (is_Numeric(ch)) numCount++;
            else if (is_Letter(ch)) charCount++;
            else return false;
        }
        
        return (charCount >= 2 && numCount >= 2);
    }

    public static boolean is_Letter(char ch){
        ch = Character.toUpperCase(ch);
        return (ch >= 'A' && ch <= 'Z');
    }
    
    public static boolean is_Numeric(char ch) {
        return (ch >= '0' && ch <= '9');
    }
}

/* ----- Output ----
1. A password must have at least eight characters.
2. A password must contain at least two digits 
------ ------ ------ ------ ------ ------ 
Input: Enter a password: YahooMail2019
Result: Password is valid: YahooMail2019
*/