Question

java bluej

Create a class called Vehicle, that contains five fields, current speed, power, accelerate, decelerate and top speed, all of which type is int.  Define a constructor that takes and sets the accelerate, decelerate; sets the power to 20, and top speed to 120. Leave the current speed as 0. Also define a constructor that takes no parameters. The power field should be set to the value of 30 in this constructor, top speed to 160, and accelerate and decelerate to reasonable amounts. Leave the current speed as 0. Define the mutators speed up and brake, whose effect is to increase or decrease the value of current speed by the (power + accelerate) and (power + decelerate) respectively. The mutator methods should not let the current speed to be set to a value higher than the top speed, or lower than zero. Add a mutator method that sets the value of the power. Add a check to make sure that the new power value is not set higher than 50 or lower than 10.

Define an accessor method to return the value of current speed.

Answer 1

class Vehicle {
   private int currentSpeed;
   private int power;
   private int accelerate;
   private int decelerate;
   private int topSpeed;
   public Vehicle(int aAccelerate, int aDecelerate) {
       super();
       accelerate = aAccelerate;
       decelerate = aDecelerate;
       power=20;
       currentSpeed=0;
       topSpeed=120;
   }
   public Vehicle() {
       accelerate = 10;
       decelerate = 10;
       power=30;
       topSpeed=160;
       currentSpeed=0;
   }
   public void brake(int s) {
       s=s+power;
       currentSpeed-=s;
       if(currentSpeed<0)
           currentSpeed=0;
       if(currentSpeed>topSpeed)
           currentSpeed=topSpeed;
   }
   public void setCurrentSpeed(int aCurrentSpeed) {
       if(aCurrentSpeed<=10 && aCurrentSpeed<=50)
       currentSpeed = aCurrentSpeed;
   }
   public int getCurrentSpeed() {
       return currentSpeed;
   }
   @Override
   public String toString() {
       return "Vehicle [currentSpeed=" + currentSpeed + ", power=" + power + ", accelerate=" + accelerate
               + ", decelerate=" + decelerate + ", topSpeed=" + topSpeed + "]";
   }
  
}

public class TestVehicle {
   public static void main(String[] args) {
       Vehicle v = new Vehicle();
       System.out.println(v);
   }
}

Note : Please comment below if you have concerns. I am here to help you

If you like my answer please rate and help me it is very Imp for me