import java.util.*;
import java.lang.*;

public class SecurityJL
{

   public static void main(String args[])
   {
    Scanner console = new Scanner(System.in);

    String input;

    System.out.println("Enter the student's name, Social Security number, user ID, and password ");
     input = console.nextLine();

     int i = 0;
     boolean socialcheck = false;


    while (socialcheck == false)
    {
     socialcheck = Character.isDigit(input.charAt(i));

     i++;
    }
    ;
    String name = input.substring(0, i - 1);


    int userstart = i + 10;

    i = i + 11;

    boolean userspacecheck = false;

    while (userspacecheck == false)
    {
     userspacecheck = Character.isSpaceChar(input.charAt(i));

     i++;
    }

    String user = input.substring(userstart, i);


    System.out.print(name + "xxx-xx-xxxx" + user);


    String pass = input.substring(i);

    int passlength = pass.length();

    int passcounter = 0;

    while (passcounter < passlength)
    {
     System.out.print("x");

     passcounter++;
    }

   }
}

















import java.util.*;
import java.lang.*;

public class LoanJL
{

   public static void main(String args[])
   {
    Scanner console = new Scanner(System.in);

    System.out.println("Enter the loan amount ");
     double loan = console.nextDouble();

    System.out.println("Enter the interest rate per year as a percentage (consider any number entered as a percentage) ");
     double intrate  = console.nextDouble();

    System.out.println("Enter the monthly payment");
     double monthpay  = console.nextDouble();


    int monthcount = 0;
    boolean doable = true;


    while (loan > 0)
    {
     loan = loan - (monthpay - (intrate / 12) * .01 * loan);

     if (monthpay < (intrate / 12) * .01 * loan)
     {
      System.out.println("The monthly payment is too low and the loan amount cannot be repaid.");
       doable = false;
        break;
     }

     monthcount++;
    }

    if (doable)
     System.out.println(monthcount);

   }
}



















import java.util.*;
import java.io.*;

public class NamesJL
{

   public static void main(String args[])
   {
    try
    {
     Scanner inFile = new Scanner(new FileReader("Student_Names.txt"));

    while (inFile.hasNextLine())
    {
     String line = inFile.nextLine();
      System.out.println(format(line));
    }
   }

       catch (FileNotFoundException error)
      {
      System.out.println("Error, file not found");
      }

   }

   static String format(String line)
   {
    int i = line.indexOf(',');

    String last = line.substring(0 , i);

    i = i + 2;

    String first = line.substring(i);


    return first + " " + last;
   }
}