Attribute with forumula to accept only 20 characters

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• check if a string contains only some characters

  I'm working on a java program that converts the Roman numbers. The user enters a string, and I need to check to make sure that it contains MDCLXVI and if he doesn't I will get them the input again string. I thought I'd do a while loop but I'm not sure if it's the smart way to make or the syntax to perform the check.
  
  Here was a thought on the control with a while loop, but I've never used it before and maybe build evil.

  while (!Pattern.matches("MDCLXVI", firstRoman))
          {
          System.out.print("Not a valid Roman Number please try again");
          firstRoman = firstRoman.toUpperCase();
          }

  My Code is as follows:
  

  // Ask for user to input firstRoman Number
          System.out.print("Enter your first Roman Number:");
          // add the Roman Number to the String variable
          firstRoman = keyboard.nextLine();
          firstRoman = firstRoman.toUpperCase();

  Once they enter in the it, I want to check to make sure that it has characters MDCLXVI and if it contains any other characters then I will provide a new object Scanner keyboard to try again and if it fails again, it will go to the option to try again until they put in a string that contains only the characters above. I don't know where to go here to get the while loop has worked. New to Java and I got my program work properly when I put good known numbers of novel, but I want to take incorrect entries.
  
  Any help would be appreciated.
  
  Thank you
  Wally
  
  I put the code for my main program and my class below just in case. I have already met the requirements of the teacher if the project is done, I'm just trying to improve.
  

  /*
   * To change this template, choose Tools | Templates
   * and open the template in the editor.
   */
  package myname.project.pkg6;
  
  import java.util.Scanner;
  import java.util.regex.Pattern;
  
  /**
   *
   * @author wsteadma
   */
  public class mynameProject6 {
  
      /**
       * @param args the command line arguments
       */
      public static void main(String[] args) {
          
          // Used for testing
          String firstRoman;
          String secondRoman;
          
          
          Scanner keyboard = new Scanner(System.in);
  
          
          // Ask for user to input firstRoman Number
          System.out.print("Enter your first Roman Number:");
          // add the Roman Number to the String variable
          firstRoman = keyboard.nextLine();
          firstRoman = firstRoman.toUpperCase();
          
                
          // Ask for user to input secondRoman Number
          System.out.print("Enter your second Roman Number:");
          // add the Roman Number to the String variable
          secondRoman = keyboard.nextLine(); // Add the name input into the name variable
          secondRoman = secondRoman.toUpperCase();
          
          
          //Creating first instance of Roman Numbers class
          Roman firstNumber = new Roman(firstRoman);
          Roman secondNumber = new Roman(secondRoman);
          
          System.out.println("Printout of the created roman numbers");
          //Prints out the Roman Number
          firstNumber.printRoman();
          secondNumber.printRoman();
          
          
          // Convert Roman to Decimal
          firstNumber.setDecimal(firstRoman);
          secondNumber.setDecimal(secondRoman);
          
          System.out.println("Viewing the Decimal values for the two defined instances");
          //Prints decimal Numbers
          firstNumber.printDecimal();  
          secondNumber.printDecimal();
          
          System.out.println("Adding the Roman Numbers and returning new Roman value");
          Roman romanAdd;
          romanAdd = firstNumber.addRoman(secondNumber);
          romanAdd.printRoman();
  
          System.out.println("Subtracting the Roman Numbers and return new Roman value");
          Roman romanSub;
          romanSub = firstNumber.subRoman(secondNumber);
          romanSub.printRoman();
      }
  }

  CLASS:

  /*
   * To change this template, choose Tools | Templates
   * and open the template in the editor.
   */
  package myname.project.pkg6;
  
  /**
   *
   * @author wsteadma
   */
  public class Roman {
  
      private String romNumber;
      private int decNumber;
  
      public Roman(String rNumber) {
          romNumber = rNumber;
      }
  
      public String getRoman() {
          return romNumber;
      }
      
      public int getDecimal()
      {
      return decNumber;
      }
  
      public void printRoman() {
          System.out.println("The Roman Number is " + romNumber);
      }
  
      public void printDecimal() {
          System.out.println("The Decimal Number is " + decNumber);
      }
  
      // Converts a roman number string into a decimal value
      public int setDecimal(String romNum) {
          int charValue = 0;
          char[] characters = new char[romNum.length()];
  
          //System.out.println("romNum length is " + romNum.length());
          for (int counter = 0; counter < romNum.length(); counter++) {
              characters[counter] = romNum.charAt(counter);
              //System.out.println(characters[counter]);
          }
  
          for (int sCounter = 0; sCounter < romNum.length(); sCounter++) {
              if (characters[sCounter] == 'M'  || characters[sCounter] == 'm') {
                  charValue += 1000;
              } else if (characters[sCounter] == 'D' || characters[sCounter] == 'd') {
                  charValue += 500;
              } else if (characters[sCounter] == 'C' || characters[sCounter] == 'c') {
                  charValue += 100;
              } else if (characters[sCounter] == 'L' || characters[sCounter] == 'l') {
                  charValue += 50;
              } else if (characters[sCounter] == 'X' || characters[sCounter] == 'x') {
                  charValue += 10;
              } else if (characters[sCounter] == 'V' || characters[sCounter] == 'v') {
                  charValue += 5;
              } else if (characters[sCounter] == 'I' || characters[sCounter] == 'i') {
                  charValue += 1;
              }
          
          }
          decNumber = charValue;
          return charValue;
      }
  
      // Converts a decomal number to a roman number
      public String setDec2Roman(int decNum) {
          String newRoman = "";
  
          while (decNum >= 1000) {
              newRoman += "M";
              decNum -= 1000;
              //System.out.println(decNum);
              //System.out.println(newRoman);
          }
  
          while (decNum >= 500) {
              newRoman += "D";
              decNum -= 500;
              //System.out.println(decNum);
              //System.out.println(newRoman);
          }
  
          while (decNum >= 100) {
              newRoman += "C";
              decNum -= 100;
              //System.out.println(decNum);
              //System.out.println(newRoman);
          }
  
          while (decNum >= 50) {
              newRoman += "L";
              decNum -= 50;
              //System.out.println(decNum);
              //System.out.println(newRoman);
          }
  
          while (decNum >= 10) {
              newRoman += "X";
              decNum -= 10;
              //System.out.println(decNum);
              //System.out.println(newRoman);
          }
  
          while (decNum >= 5) {
              newRoman += "V";
              decNum -= 5;
              //System.out.println(decNum);
              //System.out.println(newRoman);
          }
  
          while (decNum > 0) {
              newRoman += "I";
              decNum -= 1;
              //System.out.println(decNum);
              //System.out.println(newRoman);
          }
          return newRoman;
      }
  
      public Roman addRoman(Roman newRom) {
          int totRom = newRom.setDecimal(newRom.romNumber) + decNumber;
          romNumber = newRom.setDec2Roman(totRom);
          return new Roman(romNumber);
      }
      
      public Roman subRoman(Roman subRom) {
          int totRom = decNumber - subRom.setDecimal(subRom.romNumber);
          romNumber = subRom.setDec2Roman(totRom);
          return new Roman(romNumber);
      }
      
  }

  While (!.) Pattern.Matches ("MDCLXVI", firstRoman))

  Try "[MDCLXVI] *" and see if it's better

  {
  System.out.Print ("a valid Roman Number please try again");
  firstRoman = firstRoman.toUpperCase ();
  }

  My Code is as follows:

  // Ask for user to input firstRoman Number
  System.out.print("Enter your first Roman Number:");
  // add the Roman Number to the String variable
  firstRoman = keyboard.nextLine();
  firstRoman = firstRoman.toUpperCase();
  

  Once they enter in the it, I want to check to make sure that it has characters MDCLXVI and if it contains any other characters then I will provide a new object Scanner keyboard to try again and if it fails again, it will go to the option to try again until they put in a string that contains only the characters above. I don't know where to go here to get the while loop has worked. New to Java and I got my program work properly when I put good known numbers of novel, but I want to take incorrect entries.

  Any help would be appreciated.

  Thank you
  Wally

  I put the code for my main program and my class below just in case. I have already met the requirements of the teacher if the project is done, I'm just trying to improve.

  /*
  * To change this template, choose Tools | Templates
  * and open the template in the editor.
  */
  package myname.project.pkg6;
  
  import java.util.Scanner;
  import java.util.regex.Pattern;
  
  /**
  *
  * @author wsteadma
  */
  public class mynameProject6 {
  
  /**
  * @param args the command line arguments
  */
  public static void main(String[] args) {
  
  // Used for testing
  String firstRoman;
  String secondRoman;
  
  Scanner keyboard = new Scanner(System.in);
  
  // Ask for user to input firstRoman Number
  System.out.print("Enter your first Roman Number:");
  // add the Roman Number to the String variable
  firstRoman = keyboard.nextLine();
  firstRoman = firstRoman.toUpperCase();
  
  // Ask for user to input secondRoman Number
  System.out.print("Enter your second Roman Number:");
  // add the Roman Number to the String variable
  secondRoman = keyboard.nextLine(); // Add the name input into the name variable
  secondRoman = secondRoman.toUpperCase();
  
  //Creating first instance of Roman Numbers class
  Roman firstNumber = new Roman(firstRoman);
  Roman secondNumber = new Roman(secondRoman);
  
  System.out.println("Printout of the created roman numbers");
  //Prints out the Roman Number
  firstNumber.printRoman();
  secondNumber.printRoman();
  
  // Convert Roman to Decimal
  firstNumber.setDecimal(firstRoman);
  secondNumber.setDecimal(secondRoman);
  
  System.out.println("Viewing the Decimal values for the two defined instances");
  //Prints decimal Numbers
  firstNumber.printDecimal();
  secondNumber.printDecimal();
  
  System.out.println("Adding the Roman Numbers and returning new Roman value");
  Roman romanAdd;
  romanAdd = firstNumber.addRoman(secondNumber);
  romanAdd.printRoman();
  
  System.out.println("Subtracting the Roman Numbers and return new Roman value");
  Roman romanSub;
  romanSub = firstNumber.subRoman(secondNumber);
  romanSub.printRoman();
  }
  }
  

  CLASS:

  /*
  * To change this template, choose Tools | Templates
  * and open the template in the editor.
  */
  package myname.project.pkg6;
  
  /**
  *
  * @author wsteadma
  */
  public class Roman {
  
  private String romNumber;
  private int decNumber;
  
  public Roman(String rNumber) {
  romNumber = rNumber;
  }
  
  public String getRoman() {
  return romNumber;
  }
  
  public int getDecimal()
  {
  return decNumber;
  }
  
  public void printRoman() {
  System.out.println("The Roman Number is " + romNumber);
  }
  
  public void printDecimal() {
  System.out.println("The Decimal Number is " + decNumber);
  }
  
  // Converts a roman number string into a decimal value
  public int setDecimal(String romNum) {
  int charValue = 0;
  char[] characters = new char[romNum.length()];
  
  //System.out.println("romNum length is " + romNum.length());
  for (int counter = 0; counter < romNum.length(); counter++) {
  characters[counter] = romNum.charAt(counter);
  //System.out.println(characters[counter]);
  }
  
  for (int sCounter = 0; sCounter < romNum.length(); sCounter++) {
  if (characters[sCounter] == 'M'  || characters[sCounter] == 'm') {
  charValue += 1000;
  } else if (characters[sCounter] == 'D' || characters[sCounter] == 'd') {
  charValue += 500;
  } else if (characters[sCounter] == 'C' || characters[sCounter] == 'c') {
  charValue += 100;
  } else if (characters[sCounter] == 'L' || characters[sCounter] == 'l') {
  charValue += 50;
  } else if (characters[sCounter] == 'X' || characters[sCounter] == 'x') {
  charValue += 10;
  } else if (characters[sCounter] == 'V' || characters[sCounter] == 'v') {
  charValue += 5;
  } else if (characters[sCounter] == 'I' || characters[sCounter] == 'i') {
  charValue += 1;
  }
  
  }
  decNumber = charValue;
  return charValue;
  }
  
  // Converts a decomal number to a roman number
  public String setDec2Roman(int decNum) {
  String newRoman = "";
  
  while (decNum >= 1000) {
  newRoman += "M";
  decNum -= 1000;
  //System.out.println(decNum);
  //System.out.println(newRoman);
  }
  
  while (decNum >= 500) {
  newRoman += "D";
  decNum -= 500;
  //System.out.println(decNum);
  //System.out.println(newRoman);
  }
  
  while (decNum >= 100) {
  newRoman += "C";
  decNum -= 100;
  //System.out.println(decNum);
  //System.out.println(newRoman);
  }
  
  while (decNum >= 50) {
  newRoman += "L";
  decNum -= 50;
  //System.out.println(decNum);
  //System.out.println(newRoman);
  }
  
  while (decNum >= 10) {
  newRoman += "X";
  decNum -= 10;
  //System.out.println(decNum);
  //System.out.println(newRoman);
  }
  
  while (decNum >= 5) {
  newRoman += "V";
  decNum -= 5;
  //System.out.println(decNum);
  //System.out.println(newRoman);
  }
  
  while (decNum > 0) {
  newRoman += "I";
  decNum -= 1;
  //System.out.println(decNum);
  //System.out.println(newRoman);
  }
  return newRoman;
  }
  
  public Roman addRoman(Roman newRom) {
  int totRom = newRom.setDecimal(newRom.romNumber) + decNumber;
  romNumber = newRom.setDec2Roman(totRom);
  return new Roman(romNumber);
  }
  
  public Roman subRoman(Roman subRom) {
  int totRom = decNumber - subRom.setDecimal(subRom.romNumber);
  romNumber = subRom.setDec2Roman(totRom);
  return new Roman(romNumber);
  }
  
  }
  

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  Original title:

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  I use a Dell laptop. How to fix it.

  Hello

  1. Once you get this error message?

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  Method 2:

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  b. right-click on the printer icon and select 'delete '.

  c. access the menu of "Server Properties" in the menu drop down "File" at the top of the window. Select the 'Drivers' tab at the top of the window. This will display all the printer drivers installed on your computer.

  d. highlight the printer driver that you want to delete by clicking on it once. Click on the button "Delete" under the list of drivers. Click 'Yes' in the context menu to remove the driver. Repeat this step to remove drivers that are additional, if necessary.

  Step 2: Install the drivers for the printer from the following link.

  http://h10025.www1.HP.com/ewfrf/wc/softwareCategory?cc=us&LC=en&DLC=en&product=391182

  See also,

  Resources for the resolution of the printer in Windows XP problems