Help with this problem please GasPump.java

Question

I've been working on this program for a week now and i have not gotten it to complie yet. Could anybody help me out? Your help would be greatly appreciated. Thanks.
public class GasPump {
      double pricePerGallon;
      double gallons;
      int fuelType;
      int paymentType;
      float washPrice;
      String fuelName;
       public GasPump ( )  
         { pricePerGallon = 2.699; }
       public GasPump ( double price)  
         { pricePerGallon = price; }        
       public void setCost(double cost)   
         { double pricePerGallon  = cost; }
       double  getCost( )
         { return pricePerGallon; }
       public setGrade(int fuelType)
         { String fuelName;
        switch (fuelType)
               case 1:    fuelName = ?Regular Unleaded?
                              break;
               case 2:    fuelName = ?Mid grade Unleaded?
                              break;
               case 3:    fuelName = ?Super Unleaded?
                              break;
               case 4:    fuelName = ?Diesel?
                              break;
               case 5:    fuelName = ?Natural Gas?
                              break;
               default:   System.out.println(?Unknown fuel type? + fuelType);
                           fuelName = ?Unknown?;
               public String getGrade ( )
               { return fuelName; }
               double calcBill (double gallons)
               { return(pricePerGallon * gallons); }
               void paymentMethod(int  paymentType)    
                if (paymentType  == 1)
               payInsideMethod();
                else
                      if (paymentType == 2)
                payOutsideMethod();
                      else
                    if (paymentType == 3)
                   payInsideMethod ( );   
                      else
                 System.out.println(?Unknown payment type?);
            void payInsideMethod( )
                 System.out.println(?Pay cashier inside the gas station?);
            void payOutsideMethod( )
            System.out.println(?Please pay with your credit card ?);
           float   carWash (int washType)
             washPrice = 0.00f;       
              if (washType == 1)
                washPrice = 7.00f;   
                  else
              if (washType == 2)
                         washPrice = 8.00f; 
              else
                        System.out.println(?Unknown wash type?);
                  return  (float)washPrice;   
                   void printReceipt ( )  
                    /*     System.out.println(fuelName + ? ? +gallons + ? Gallons purchased at $ ? + 
                           pricePerGallon + ? per gallon ? + ? Total cost is:  ? + 
                           pricePerGallon * gallons + ? Total bill is $ :" +
                           ((pricePerGallon * gallons) + washPrice)); */
                       System.out.printf("%s %.2f Gallons purchased at $%.2f per gallon.\nTotal
              cost is: %.2f",
                                           fuelName, gallons, pricePerGallon, pricePerGallon *
              gallons);
                   System.out.printf(" Total bill is $: %.2f", ((pricePerGallon * gallon) +
           washPrice));
           }

Answer 1

sorry my compile errors read
GasPump.java:31: illegal character: \8220
         case 3:    fuelName = ?Super Unleaded?;
                               ^
GasPump.java:31: illegal character: \8221
         case 3:    fuelName = ?Super Unleaded?;
                                              ^
GasPump.java:33: illegal character: \8220
         case 4:    fuelName = ?Diesel?;
                               ^
GasPump.java:33: illegal character: \8221
         case 4:    fuelName = ?Diesel?;
                                      ^
GasPump.java:35: illegal character: \8220
         case 5:    fuelName = ?Natural Gas?;
                               ^
GasPump.java:35: illegal character: \8221
         case 5:    fuelName = ?Natural Gas?;
                                           ^
GasPump.java:37: illegal character: \8220
        default:   System.out.println(?Unknown fuel type? + fuelType);
                                      ^
GasPump.java:37: illegal character: \8221
        default:   System.out.println(?Unknown fuel type? + fuelType);
                                                        ^
GasPump.java:37: ')' expected
        default:   System.out.println(?Unknown fuel type? + fuelType);
                                                                     ^
GasPump.java:38: illegal character: \8220
                           fuelName = ?Unknown?;
                                      ^
GasPump.java:38: illegal character: \8221
                           fuelName = ?Unknown?;
                                              ^
GasPump.java:59: illegal character: \8220
                          System.out.println(?Unknown payment type?);
                                             ^
GasPump.java:59: illegal character: \8221
                          System.out.println(?Unknown payment type?);
                                                                  ^
GasPump.java:59: ')' expected
                          System.out.println(?Unknown payment type?);
                                                                    ^
GasPump.java:64: illegal character: \8220
                  System.out.println(?Pay cashier inside the gas station?);
                                     ^
GasPump.java:64: illegal character: \8221
                  System.out.println(?Pay cashier inside the gas station?);
                                                                        ^
GasPump.java:64: ')' expected
                  System.out.println(?Pay cashier inside the gas station?);
                                                                          ^
GasPump.java:69: illegal character: \8220
                  System.out.println(?Pay at the pump with credit card ?);
                                     ^
GasPump.java:69: illegal character: \8221
                  System.out.println(?Pay at the pump with credit card ?);
                                                                       ^
GasPump.java:69: ')' expected
                  System.out.println(?Pay at the pump with credit card ?);
                                                                         ^
GasPump.java:82: illegal character: \8220
                         System.out.println(?Unknown wash type?);
                                            ^
GasPump.java:82: illegal character: \8221
                         System.out.println(?Unknown wash type?);
                                                              ^
GasPump.java:82: ')' expected
                         System.out.println(?Unknown wash type?);
                                                                ^
GasPump.java:94: unclosed string literal
                       System.out.printf("%s %.2f Gallons purchased at $%.2f per
gallon.\nTotal
                                         ^
GasPump.java:95: unclosed string literal
               cost is: %.2f",
                            ^
GasPump.java:97: ')' expected
                 gallons);
                         ^
26 errorsBasically wherever I have a quotation mark or a semi-colon there is a error there. I just started programming so im still trying to get the hang of it