Organizing a travel agency for multiple trips | Ask The Code

Problem Solving in Java | Object Oriented Programming in Java | AskTheCode

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Problem:

A travel agency organizes a client's travel itinerary. Each itinerary is composed of multiple trips.

A trip has a fixed distance (in kilometers), starts at an origin and ends at the destination. There are several types of trips: by plane, boat, or bus. The cost of a trip depends on what type it is:

• Boat trips cost a fixed base fare.

• Plane trips cost a base fare plus 10% fuel surcharge.

• Bus trips cost a base fare times every kilometer travelled.

Create a class hierarchy that will represent trips, including member variables to store trip details. Create member functions that will: compute the cost of the trip, and display the details of the trip: origin, destination, distance and cost.

Study the sample output carefully so you can correctly implement the trip hierarchy.

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Input Format:

• The first input is a positive integer n representing the number of trips. What follows are the n trips themselves.

• Each trip is composed of the type of trip (1 for bus, 2 boat, and 3 for plane), origin, destination, distance travelled in kilometers, and base fare.

Output Format:

Display the details of each trip, including trip type, origin, destination, distance travelled, and base fare. Finally, out the total cost for all trips in the test case.

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Sample Input:

5
1 Zamboanga Cagayan 494 5
1 Tagbilaran Panglao 20 10
2 Cebu Tagbilaran 90 800
3 Manila Davao 1500 4500
3 Clark Iloilo 751 2300

Sample Output:

Trip Constructor
Bus Constructor
Bus Trip: Zamboanga to Cagayan, 494 km, P5 base fare
Trip Constructor
Bus Constructor
Bus Trip: Tagbilaran to Panglao, 20 km, P10 base fare
Trip Constructor
Boat Constructor
Boat Trip: Cebu to Tagbilaran, 90 km, P800 base fare
Trip Constructor
Plane Constructor
Plane Trip: Manila to Davao, 1500 km, P4500 base fare
Trip Constructor
Plane Constructor
Plane Trip: Clark to Iloilo, 751 km, P2300 base fare
Trip Constructor
Total Cost of trips: 10950

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EXPLANATION:

Simple Example for Inheritance

Make a parent class Trip, in which implement getCost() method that gives total cost for the trip. Make Bus, Boat, and Plane classes as children of Trip class. See the code below to get a better understanding for this problem.

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Code:

import java.util.*;

public class Solution{
    public static void main(String[] args) throws Exception{
        Scanner in=new Scanner(System.in);
        int numOfTrips = in.nextInt();

        for (int i=1; i<=numOfTrips; i++) {
            int type = in.nextInt();
            String origin = in.next();
            String destination = in.next();
            int distance = in.nextInt();
            int base_fair = in.nextInt();
            if (type == 1){
                Bus object = new Bus(origin, destination, distance, base_fair);
            }
            else if (type == 2){
                Boat object = new Boat(origin, destination, distance, base_fair);
            }
            else if (type == 3){
                Plane object = new Plane(origin, destination, distance, base_fair);
            }
        }
        System.out.println("Total Cost of trips: " + (new Trip()).getCost());
    }
}
class Trip{
    public String origin, destination;
    public int distance, base_fair;
    protected static int total_cost = 0;

    Trip(String origin, String destination, int distance, int base_fair){
        this.origin = origin;
        this.destination = destination;
        this.distance = distance;
        this.base_fair = base_fair;
        System.out.println("Trip Constructor");
    }
    Trip(){
        this.origin = origin;
        this.destination = destination;
        this.distance = distance;
        this.base_fair = base_fair;
        System.out.println("Trip Constructor");
    }
    public int getCost(){
        return total_cost;
    }
}
class Bus extends Trip{
    Bus(String origin, String destination, int distance, int base_fair){
        System.out.println("Bus Constructor");
        System.out.println("Bus Trip: "+origin+" to "+destination+", "+distance+" km, P"+base_fair+" base fare");
        super.total_cost += (distance * base_fair);
    }
}
class Boat extends Trip{
    Boat(String origin, String destination, int distance, int base_fair){
        System.out.println("Boat Constructor");
        System.out.println("Boat Trip: "+origin+" to "+destination+", "+distance+" km, P"+base_fair+" base fare");
        super.total_cost += (base_fair);
    }
}
class Plane extends Trip{
    Plane(String origin, String destination, int distance, int base_fair){
        System.out.println("Plane Constructor");
        System.out.println("Plane Trip: "+origin+" to "+destination+", "+distance+" km, P"+base_fair+" base fare");
        super.total_cost += (base_fair + (0.10 * base_fair));
    }
}