CarYardMIT162011 Class Implementation in Java

This article explains the implementation of CarYardMIT162011 class in Java with UML class diagram, Car class and Driver class. It covers the functionalities of buying, selling and displaying cars in a car yard. The Car class contains attributes like id, modelName, year, costPrice and sellingPrice. The Driver class contains methods like buy(), sell() and display().

Task1: UML Class Diagram
Task 2: Car Class
package caryard;
public class Car {
int id;
String modelName;
int year;
double costPrice, sellingPrice;
Car(String name, int year, double costPrice){
setID();
this.modelName = name;
this.year = year;
this.costPrice = costPrice;
sellingPrice = calcSP();
}
public void setID(){
id = (int) ((Math.random() * ((1000 - 100) + 1)) + 100);
}
int getID(){
return id;
}
String getModel(){
return modelName;
}
int getYear(){
return year;
}

double getCP(){
return costPrice;
}
double getSP(){
return sellingPrice;
}
double calcSP(){
return costPrice*(1 + 0.3);
}
}
Task 3: Driver Class
package caryard;
import java.util.Scanner;
public class CarYardMIT162011 {
static Car[] cars = new Car[100];
static int carCount=0;
static Scanner sc = new Scanner(System.in);
private static void buy(){
System.out.println("\n~ Buy Car ~");
System.out.println("\nEnter model name:");
String name = sc.nextLine();
int year;
while(true){
System.out.println("Enter year:");
year = sc.nextInt();
if(year<2009)
System.out.println("\nError! The car yard does not
buy cars manufactured before 2009.");
else
break;
}
System.out.println("Enter price: $");
double price = sc.nextDouble();
cars[carCount]=new Car(name,year,price);
System.out.println("\nNew car added: "+name+" ("+year+")");
carCount++;
}
private static void display(){
System.out.println("\n~ Car List ~");
for(int i=0;i<carCount;i++){
System.out.println("\n"+(i+1)+":");
System.out.println("\n\tCar ID: "+cars[i].getID());
System.out.println("\n\tModel: "+cars[i].getModel());
System.out.println("\n\tYear: "+cars[i].getYear());
System.out.println("\n\tCost price: $"+cars[i].getCP());
System.out.println("\n\tSelling price:
$"+cars[i].getSP());
System.out.println();
}
}

private static int sell(){
System.out.println("\n~ Sell Car ~");
System.out.println("\nEnter car ID:");
int id = sc.nextInt();
for(int i=0;i<carCount;i++){
if(cars[i].getID()==id){
System.out.println("\n\tModel:
"+cars[i].getModel());
System.out.println("\n\tYear: "+cars[i].getYear());
System.out.println("\n\tCost price:
$"+cars[i].getCP());
System.out.println("\n\tSelling price:
$"+cars[i].getSP());
return 1;
}
}
System.out.println("No match found for car ID: "+id);
return 0;
}
public static void main(String[] args){
int choice=1;
cars[carCount]=new Car("Mazda",2009,15000);
carCount++;
cars[carCount]=new Car("Suzuki",2018,7000);
carCount++;
cars[carCount]=new Car("Royce",2015,12000);
carCount++;
while(choice!=4){
System.out.println("\n~ Main Menu ~");
System.out.print("1. Buy Car\n2. Sell Car\n3. Display all
cars\n4. Exit\n\nEnter menu choice... ");
choice = sc.nextInt();
sc.nextLine();
switch(choice){
case 1: buy();
break;
case 2: sell();
break;
case 3: display();
break;
case 4:
System.out.println("\nGoodbye! Have a nice day!");
break;
default: System.out.println("Wrong entry!");
}
}
}
}

Output
~ Main Menu ~
1. Buy Car
2. Sell Car
3. Display all cars
4. Exit
Enter menu choice... 1
~ Buy Car ~
Enter model name:
Ferrari
Enter year:
2016
Enter price: $
25000
New car added: Ferrari (2016)
~ Main Menu ~
1. Buy Car
2. Sell Car
3. Display all cars
4. Exit
Enter menu choice... 3
~ Car List ~
1:
Car ID: 719
Model: Mazda
Year: 2009
Cost price: $15000.0
Selling price: $19500.0
2:
Car ID: 393
Model: Suzuki
Year: 2018
Cost price: $7000.0
Selling price: $9100.0
3:

Car ID: 620
Model: Royce
Year: 2015
Cost price: $12000.0
Selling price: $15600.0
4:
Car ID: 671
Model: Ferrari
Year: 2016
Cost price: $25000.0
Selling price: $32500.0
~ Main Menu ~
1. Buy Car
2. Sell Car
3. Display all cars
4. Exit
Enter menu choice... 5
Wrong entry!
~ Main Menu ~
1. Buy Car
2. Sell Car
3. Display all cars
4. Exit
Enter menu choice... 2
~ Sell Car ~
Enter car ID:
323
No match found for car ID: 323
~ Main Menu ~
1. Buy Car
2. Sell Car
3. Display all cars
4. Exit
Enter menu choice... 2
~ Sell Car ~
Enter car ID:

393
Model: Suzuki
Year: 2018
Cost price: $7000.0
Selling price: $9100.0
~ Main Menu ~
1. Buy Car
2. Sell Car
3. Display all cars
4. Exit
Enter menu choice... 4
Goodbye! Have a nice day!