I am having problems catching an exception I made

Question

I made an exception, but my program won't catch it.
import java.io.*;
import java.util.Scanner;
public class Driver {
     public static void main(String [] args){
          String input;
          InputStream yourfile;
          Scanner file;
          Scanner scan = new Scanner (System.in);
          System.out.println("Enter the file you want to view:");
          input = scan.next();
          yourfile = Driver.class.getResourceAsStream(input);
          file = new Scanner(yourfile);
          System.out.println("Designation Code Report Number Title");
          input = file.nextLine();
          try{
          do{
               input = file.nextLine();
          if ((input.charAt(0)=='U')){
               System.out.println("Unclassified "+ input);
          else
               if ((input.charAt(0)=='C')){
                    System.out.println("Confidential "+ input);
               else
                    if ((input.charAt(0)=='P')){
                         System.out.println("Proprietary "+ input);
          }while(file.hasNext()==true);     
          }catch(InvalidDocumentCodeException exception){
               System.out.println("LOSE");
}My exception code:
public class InvalidDocumentCodeException extends Exception {
     public InvalidDocumentCodeException(String message) {
          super(message);
}

Answer 1

That was a brain fart of a mistake. I put the throw in there, but it says that it's undefined.
import java.io.*;
import java.util.Scanner;
public class Driver {
     public static void main(String [] args){
          String input;
          InputStream yourfile;
          Scanner file;
          Scanner scan = new Scanner (System.in);
          System.out.println("Enter the file you want to view:");
          input = scan.next();
          yourfile = Driver.class.getResourceAsStream(input);
          file = new Scanner(yourfile);
          System.out.println("Designation Code Report Number Title");
          input = file.nextLine();
          try{
          do{
               input = file.nextLine();
          if ((input.charAt(0)=='U')){
               System.out.println("Unclassified "+ input);
          else
               if ((input.charAt(0)=='C')){
                    System.out.println("Confidential "+ input);
               else
                    if ((input.charAt(0)=='P')){
                         System.out.println("Proprietary "+ input);
                    else
                         throw InvalidDocumentCodeException("Exception!");
          }while(file.hasNext()==true);     
          }catch(InvalidDocumentCodeException exception){
               System.out.println("LOSE");
}