Please help to fix this code is wil not run without errors. import javax.swing.*

Question

 Please help to fix this code is wil not run without errors.   import javax.swing.*; class Vehicle {      private int numberOfWheels;     private int milePerGallon;          public int getNunberOfWheels(){         return numberOfWheels;     }     public int getMilesPerGallon(){         return milePerGallon;        }     void setMilesPerGallon(int mpg){         milePerGallon = mpg;     }     void setNumberOfWheels(int n){         numberOfWheels = n;     }     public Vehicle(int noOfWheels, int mpg){         numberOfWheels = noOfWheels;         milePerGallon = mpg;     }      } class PassengerCar extends Vehicle{     private int fuelTank;          void setFuelTank(int ft){         fuelTank = ft;     }     int getFuelTank(){         return fuelTank;     }     public PassengerCar(int mpg, int fuelTank) {         super(4, mpg);         this.fuelTank = fuelTank;     }          public double maxDistanceDriven(){         return fuelTank * super.getMilesPerGallon();     } } class Truck extends Vehicle{     private double cargoLoad;     double getCargoLoad(){           return cargoLoad;     }     void setCargoLoad(double cL){         cargoLoad = cL;     }     public Truck(int mpg, double cargoLoad) {         super(8, mpg);         this.cargoLoad = cargoLoad;     }      }  public class UseVehicles{        public static void main(String[] args) {                        int numberOfWheels;            numberOfWheels = Integer.parseInt(JOptionPane.showInputDialog("Enter number of wheels"));            int milesPerGallon;            milesPerGallon = Integer.parseInt(JOptionPane.showInputDialog("Enter miles per gallon"));            int fuelTank;            fuelTank = Integer.parseInt(JOptionPane.showInputDialog("Enter fuel tank capacity"));            double cargoLoad;            cargoLoad = Integer.parseInt(JOptionPane.showInputDialog("Enter cargo load"));                         Vehicle v = new Vehicle(numberOfWheels,milesPerGallon);             PassengerCar p1 = new PassengerCar(milesPerGallon, fuelTank);             Truck t1 = new Truck(milesPerGallon, cargoLoad);                          String vehicleOutput = "Vehicle information:  Number of wheels: " + v.getNunberOfWheels() + " Average miles per gallon: " + v.getMilesPerGallon();             String carOutput = "Number of wheels: " + p1.getNunberOfWheels() + " Average miles per gallon: " + p1.getMilesPerGallon()                     + " Fuel Tank Capacity: " +p1.getFuelTank() + " Maximum distance driven: " + p1.maxDistanceDriven() ;             String truckOutput = "Number of wheels: " + t1.getNunberOfWheels() + " Average miles per gallon: " + t1.getMilesPerGallon()                     + " Cargo Capacity: " + t1.getCargoLoad();             JOptionPane.showMessageDialog(null , vehicleOutput, "Vehicle Information", 1 );             JOptionPane.showMessageDialog(null , carOutput, "Passenger Car Information", 1);             JOptionPane.showMessageDialog(null , truckOutput, "Truck Information", 1);              }   } 

Explanation / Answer

Now the code is working with the following change , the change is i underlined in below line

i only changed one line i.e   public static void main(String[] args) throws Exception

modified program :

import javax.swing.*;
class Vehicle {

private int numberOfWheels;
private int milePerGallon;
  
public int getNunberOfWheels(){
return numberOfWheels;
}
public int getMilesPerGallon(){
return milePerGallon;   
}
void setMilesPerGallon(int mpg){
milePerGallon = mpg;
}
void setNumberOfWheels(int n){
numberOfWheels = n;
}
public Vehicle(int noOfWheels, int mpg){
numberOfWheels = noOfWheels;
milePerGallon = mpg;
}
  
}
class PassengerCar extends Vehicle{
private int fuelTank;
  
void setFuelTank(int ft){
fuelTank = ft;
}
int getFuelTank(){
return fuelTank;
}
public PassengerCar(int mpg, int fuelTank) {
super(4, mpg);
this.fuelTank = fuelTank;
}
  
public double maxDistanceDriven(){
return fuelTank * super.getMilesPerGallon();
}
}
class Truck extends Vehicle{
private double cargoLoad;
double getCargoLoad(){
return cargoLoad;
}
void setCargoLoad(double cL){
cargoLoad = cL;
}
public Truck(int mpg, double cargoLoad) {
super(8, mpg);
this.cargoLoad = cargoLoad;
}
  
}

public class UseVehicles{
public static void main(String[] args) throws Exception {

int numberOfWheels;
numberOfWheels = Integer.parseInt(JOptionPane.showInputDialog("Enter number of wheels"));
int milesPerGallon;
milesPerGallon = Integer.parseInt(JOptionPane.showInputDialog("Enter miles per gallon"));
int fuelTank;
fuelTank = Integer.parseInt(JOptionPane.showInputDialog("Enter fuel tank capacity"));
double cargoLoad;
cargoLoad = Integer.parseInt(JOptionPane.showInputDialog("Enter cargo load"));

Vehicle v = new Vehicle(numberOfWheels,milesPerGallon);
PassengerCar p1 = new PassengerCar(milesPerGallon, fuelTank);
Truck t1 = new Truck(milesPerGallon, cargoLoad);
  
String vehicleOutput = "Vehicle information: Number of wheels: " + v.getNunberOfWheels() + " Average miles per gallon: " + v.getMilesPerGallon();
String carOutput = "Number of wheels: " + p1.getNunberOfWheels() + " Average miles per gallon: " + p1.getMilesPerGallon()
+ " Fuel Tank Capacity: " +p1.getFuelTank() + " Maximum distance driven: " + p1.maxDistanceDriven() ;
String truckOutput = "Number of wheels: " + t1.getNunberOfWheels() + " Average miles per gallon: " + t1.getMilesPerGallon()
+ " Cargo Capacity: " + t1.getCargoLoad();
JOptionPane.showMessageDialog(null , vehicleOutput, "Vehicle Information", 1 );
JOptionPane.showMessageDialog(null , carOutput, "Passenger Car Information", 1);
JOptionPane.showMessageDialog(null , truckOutput, "Truck Information", 1);
  
}

}

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