// Try This 7-1
//
// Build a subclass of Vehicle for trucks. 
class Vehicle {    
  private int passengers; // number of passengers    
  private int fuelcap;    // fuel capacity in gallons   
  private int mpg;        // fuel consumption in miles per gallon   
   
  // This is a constructor for Vehicle.  
  Vehicle(int p, int f, int m) {  
    passengers = p;  
    fuelcap = f;  
    mpg = m;  
  }  
 
  // Return the range.   
  int range() {   
    return mpg * fuelcap;   
  }   
   
  // Compute fuel needed for a given distance.  
  double fuelneeded(int miles) {   
    return (double) miles / mpg;   
  } 
 
  // Access methods for instance variables. 
  int getPassengers() { return passengers; } 
  void setPassengers(int p) { passengers = p; } 
  int getFuelcap() { return fuelcap; } 
  void setFuelcap(int f) { fuelcap = f; } 
  int getMpg() { return mpg; } 
  void setMpg(int m) { mpg = m; } 
   
}    
  
// Extend Vehicle to create a Truck specialization.    
class Truck extends Vehicle {  
  private int cargocap; // cargo capacity in pounds  
  
  // This is a constructor for Truck.  
  Truck(int p, int f, int m, int c) {  
    /* Initialize Vehicle members using 
       Vehicle's constructor. */ 
    super(p, f, m);  
 
    cargocap = c;  
  }  
 
  // Accessor methods for cargocap. 
  int getCargo() { return cargocap; } 
  void putCargo(int c) { cargocap = c; } 
}  
    
class TruckDemo {    
  public static void main(String args[]) {    
  
    // construct some trucks 
    Truck semi = new Truck(2, 200, 7, 44000);    
    Truck pickup = new Truck(3, 28, 15, 2000);    
    double gallons;   
    int dist = 252;   
   
    gallons = semi.fuelneeded(dist);    
    
    System.out.println("Semi can carry " + semi.getCargo() +  
                       " pounds."); 
    System.out.println("To go " + dist + " miles semi needs " +   
                       gallons + " gallons of fuel.\n");   
       
    gallons = pickup.fuelneeded(dist);    
    
    System.out.println("Pickup can carry " + pickup.getCargo() +  
                       " pounds."); 
    System.out.println("To go " + dist + " miles pickup needs " +   
                       gallons + " gallons of fuel.");  
  }    
}