Question

This is java. I need help with my computer science class.

Complete the ParkingGarage class shown below. The ParkingGarage class keeps track of how many cars are present, the maximum number of cars it can hold and the parking fee. The number of cars present in the garage at any given time cannot exceed the maximum and can never be negative.

public class ParkingGarage
{
      // declare instance variables

      // postcondition: all instance variables are initialized
      public ParkingGarage(int numCars, int maxCapacity, double fee)
      {

      }

      // postcondition: the number of occupied parking spaces and daily admittance are
      // increased by the given number and the occupied spaces cannot exceed the maximum
      public void addCars(int num)
      {

      }

      // postcondition: the number of occupied parking spaces is reduced by the
      // given number and cannot be negative
      public void deleteCars(int num)
      {

      }

      // postcondition: an amount equal to the total number of cars entering the
      // parking garage for the day multiplied by the daily fee
      public double calcSales()
      {

      }

      // other methods not shown
}

Answer 1

Code

public class ParkingGarage
{
// declare instance variables
private int numCars,maxCapacity;
double fee;
// postcondition: all instance variables are initialized
public ParkingGarage(int numCars, int maxCapacity, double fee)
{
this.fee=fee;
this.maxCapacity=maxCapacity;
this.numCars=numCars;
}

// postcondition: the number of occupied parking spaces and daily admittance are
// increased by the given number and the occupied spaces cannot exceed the maximum
public void addCars(int num)
{
if((numCars+num)<=maxCapacity)
numCars+=num;
  
}

// postcondition: the number of occupied parking spaces is reduced by the
// given number and cannot be negative
public void deleteCars(int num)
{
if((numCars-num)>=0)
numCars-=num;
}

// postcondition: an amount equal to the total number of cars entering the
// parking garage for the day multiplied by the daily fee
public double calcSales()
{
return fee*numCars;
}

// other methods not shown
}

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