Question

How to write a program that create a car class with:

$\bullet$ instance variables name and mpg (make public)

$\bullet$ No need for a main() method

In a separate file, create a CompareCars class with a main()method

$\bullet$ create 2 instances of car using new

$\bullet$ set the name and mpg for each

$\bullet$ instance variables are public, so use the name an mpg to access the instance variables

$\bullet$ compare the fuel efficiency of your 2 cars and print out which is more efficient to the screen.

finally change your variable from public to private

Answer 1

CODE IN JAVA:

Car.java File:

public class Car {

//declaring instance variables

String name ;

double mpg ;

//getters and setters

String getName() {

return this.name ;

}

void setName(String name) {

this.name = name ;

}

double getMpg() {

return this.mpg ;

}

void setMpg(double mpg) {

this.mpg = mpg ;

}

}

CompareCars.java File:

public class CompareCars {

public static void main(String[] args) {

//creating instances of 2 cars

Car car1 = new Car();

Car car2 = new Car();

//setting name and mpg to the cars

car1.setName("BMW");

car1.setMpg(45.34);

car2.setName("Audi");

car2.setMpg(50.23);

//comparing the cars and displaying the result

if(car1.getMpg()>car2.getMpg())

System.out.println(car1.getName()+" is fuel efficient car");

else if(car1.getMpg()<car2.getMpg())

System.out.println(car2.getName()+" is fuel efficient car");

else

System.out.println("Both cars are equal in fuel efficient");

}

}

OUTPUT:

Problems @ Javadoc 다 Declaration console X <terminated> CompareCars [Java Application] /Library/Java/JavaVirtualMachines/jdk1.8.0_141.jdk/Contents/Home/bin/java (22-Feb-2019, 12:33:12 PM) Audi is fuel efficient car