Question

1, Create a class Car. The class has four instance fields:

• make (String - admissible values: Chevy, Ford, Toyota, Nissan, Hyundai)
• size (String - admissible values: compact, intermediate, fullSized),
• weight (int - admissible values: 500 <= weight <= 4000)
• horsePower (int - admissible values: 30 <= horsePower <= 400)

Provide

• a default constructor that sets String values to null and int values to 0
• a parameterized constructor that sets all four instance fields to the parameter values
• setters and getters for all instance fields
• a decent toString method
  

2. Create a class CarFactory

It provides just one method public static Car createRandomCar() which creates a random car instance with value chosen from the admissible set/range.

Answer 1

// PLEASE LIKE THE SOLUTION
// FEEL FREE TO DISCUSS IN COMMENT SECTION
// JAVA PROGRAM

import java.util.*;

//Car class
class Car{
   // properties
   private String make;
   private String size;
   private int weight;
   private int horsePower;

   // constructor default
   Car(){
       make = null;
       size = null;
       weight=0;
       horsePower=0;
   }

   // param constructor
   Car(String make,String size,int weight,int horsePower){
       this.make = make;
       this.size = size;
       this.weight = weight;
       this.horsePower = horsePower;
   }

   // setters
   public void setMake(String make){
       this.make = make;
   }

   public void setSize(String size){
       this.size = size;
   }

   public void setWeight(int weight){
       this.weight = weight;
   }

   public void setHorsePower(int horsePower){
       this.horsePower = horsePower;
   }

   // getters
   public String getMake(){
       return this.make;
   }

   public String setSize(){
       return this.size;
   }

   public int setWeight(){
       return this.weight;
   }

   public int setHorsePower(){
       return this.horsePower;
   }

   // to String method
   public String toString(){
       return ("Make = "+(this.make)+" Size = "+(this.size)+" Weight = "+(this.weight)+" HorsePower = "+(this.horsePower));
   }
}

// class CarFactory
class CarFactory{
   // static method
   public static Car createRandomCar(){
       // array to store permissible values
       String makeArray[] = {"Chevy","Ford","Toyota","Nissan","Hyundai"};
       String sizeArray[] = {"compact","intermediate","fullSized"};
      
       // create instance of Random class
       Random rand = new Random();

       // Generate random integers in range 0 to 4
       int makevalue = rand.nextInt(5);

       // Generate random integers in range 0 to 2
       int sizevalue = rand.nextInt(3);

       // generate random 500 to 4000
       int weight = rand.nextInt(3501)+500;

       // generate random 30 to 400
       int horsePower = rand.nextInt(401)+30;

       // call constructor
       Car car=new Car(makeArray[makevalue],sizeArray[sizevalue],weight,horsePower);

       return car;
   }

   // main method for testing
   public static void main(String arg[]){
       Car car = createRandomCar();
       System.out.println(car);
   }
}

// SAMPLE OUTPUT