Question

Create a class called Car (Car.java). It should have the following private data members:

• String make

• String model

• int year

Provide the following methods:

• default constructor (set make and model to an empty string, and set year to 0)

• non-default constructor Car(String make, String model, int year)

• getters and setters for the three data members

• method print() prints the Car object’s information, formatted as follows:

Make: Toyota

Model: 4Runner

Year: 2010

public class Car {

}

Complete the following unit test for the class Car described above. Make sure to test each public constructor and each public method, print the expected and actual results.

// Start of the unit test of class Car

public class CarTester {

public static void main() {

// Your source codes are placed here

return;

}

}

Answer 1

import java.util.*;
import java.lang.*;

class Car{
    
    //Declare a private variables.
    private String make;
    private String model;
    private int year;

    //Default constructor.
    public Car(){
        this.make = "";
        this.model = "";
        this.year = 0;
    }
    //Constructor with user-defined values.
    public Car(String make  , String model , int year) {
        this.make = make;
        this.model = model;
        this.year = year;
    }

    //Getter and Setter method for all of them.
    public void setMake(String make) {
        this.make = make;
    }

    public void setModel(String model) {
        this.model = model;
    }

    public void setYear(int year) {
        this.year = year;
    }

    public String getMake() {
        return make;
    }

    public String getModel() {
        return model;
    }

    public int getYear() {
        return year;
    }

    
    //Print function for print object in appropriate order.
    public void print(){
        System.out.println("Make: " + make);
        System.out.println("Model: " + model);
        System.out.println("Year: " + year);
    }
}
class CarTester {
    public static void main(String[] args) {
        
        //Testing code.
        Car test1 = new Car();
        test1.setMake("toyota");
        test1.setModel("4tuner");
        test1.setYear(2010);
        System.out.println(test1.getMake());
        System.out.println(test1.getModel());
        System.out.println(test1.getYear());

        Car test2 = new Car("Audi" , "a4" , 2012);
        test2.print();

    }
}

OUTPUT :-