Create two classes "Car" and "Bike" from interface "Vehicle" as below:

interfaceVehicle {
voidchangeGear(int a);	// To set the gear to a.
voidspeedUp(int a);			// To add a in speed.
voidapplyBrakes(int a);	// To decrease a from speed.
}

The classes must have gear and speed class variables and also a toString method to return a string as "150kmph" if 150 is the current speed.

// Create classes Car and Bike here as specified.
// Create classes Car and Bike here as specified.
class Car implements Vehicle
{
int gear=0;
int speed=0;
public void changeGear(int a)
{
gear=a;
}
public void speedUp(int a)
{
speed=speed+a;
}
public void applyBrakes(int a)
{
speed=speed-a;
}
public String toString()
{
return speed+"kmph";
}
}
class Bike implements Vehicle
{
int gear=0;
int speed=0;
public void changeGear(int a)
{
gear=a;
}
public void speedUp(int a)
{
speed=speed+a;
}
public void applyBrakes(int a)
{
speed=speed-a;
}
public String toString()
{
return speed+"kmph";
}
}