ANSWER
The program in JAVA for the given scenario is as follows.
import java.util.*;
public class Car
{
// variables declaration
static int _year_model;
static String _make;
static int _speed;
public static void _init_( int model, String m )
{
// variables initialization
_year_model = model;
_make = m;
_speed = 0;
}
public static void accelerate()
{
_speed = _speed + 5;
}
public static void brake()
{
_speed = _speed - 5;
}
public static int get_speed()
{
// current value of speed is returned
return _speed;
}
public static void main(String[] args) {
// object of class created
Car ob = new Car();
// method called using object of class
ob._init_(2019, "audi");
ob.accelerate();
System.out.println("Accelerated speed " + ob.get_speed());
ob.accelerate();
System.out.println("Accelerated speed " + ob.get_speed());
ob.accelerate();
System.out.println("Accelerated speed " + ob.get_speed());
ob.accelerate();
System.out.println("Accelerated speed " + ob.get_speed());
ob.accelerate();
System.out.println("Accelerated speed " + ob.get_speed());
System.out.println();
ob.brake();
System.out.println("Speed after brake " + ob.get_speed());
ob.brake();
System.out.println("Speed after brake " + ob.get_speed());
ob.brake();
System.out.println("Speed after brake " + ob.get_speed());
ob.brake();
System.out.println("Speed after brake " + ob.get_speed());
ob.brake();
System.out.println("Speed after brake " + ob.get_speed());
}
}
OUTPUT
Accelerated speed 5
Accelerated speed 10
Accelerated speed 15
Accelerated speed 20
Accelerated speed 25
Speed after brake 20
Speed after brake 15
Speed after brake 10
Speed after brake 5
Speed after brake 0
EXPLANATION
1. Variables are declared with String and integer datatypes.
2. _init_() initializes all the variables. This method is also called inside main() using object of Car class in order to initialize the variable speed to 0.
3. Inside main(), object of Car class created.
Car ob = new Car();
4. All the methods are called using object of the class.
ob._init_(2019, "audi");
ob.accelerate();
ob.brake();
5. All the variables are declared as static.
6. All the methods are declared as static since main() method is static inside which all other methods are called.
7. New line is included to improve readability of the output.
