Thread: Constructor/Accessors/methods problem!!

Hi Here is my following problem:

I have 3 fields:
yearModel
make
speed

the class is labeled Car.

I must create a cosntructor thast accepts the cars year model and make as arguments. these values should be asssigned to the objects yearModel and make fields. the constructor should also assign 0 to the speed field.

I must create get methods that get the values stored in yearmodel make and speed fields

i must create an accelerate method that should add 5 to the speed each time it is called

i must also create a brake method that will minus 5 to the speed each time it is called

I must demonstrate this class in a program that calls the accelerate method 5 times. after each time it is called i must get the current speed and display it.

then i must call the brake method 5 times and after each time it is called get the current speed and display it.

I think i have the class set up correctly but not sure: I also am not quite sure how to start the program and how to execute propely. mainly how to call the methods in the program.

package CAR_PKG;

public class car {
private int yearModel;
private String make;
private int speed;



public car(int year, String m, int s){
yearModel=year;
make=m;
speed=s;
speed=0;

}
public int getyearModel()
{
return yearModel;
}
public String getmake()
{
return make;
}
public int getspeed()
{
return speed;
}
public int accelerate(int s){
int sum=s+5;
return sum;

}
public int brake(int s){
int sub=s-5;
return sub;
}

}

Why you making speed zero.

Here is how you should call your methods
MainClass to call your car Class

public class MainClass {

public static void main(String[] args) {

car cc=new car(1990,"Maruti",55);
//for(int i=0;i<5;i++)
cc.accelerate();
//for(int i=0;i<2;i++)
cc.brake();

System.out.println(cc);


}

}

your Car class

public class car
{
private int yearModel;
private String make;
private int speed;



public car(int year, String m,int s)
{
yearModel=year;
make=m;
speed=s;

}
public int getyearModel()
{
return yearModel;
}
public String getmake()
{
return make;
}
public int getspeed()
{
return speed;
}
public int accelerate()
{
this.speed=speed+5;
return speed;

}
public int brake()
{
this.speed=speed-5;
return speed;
}
@Override
public String toString() {
return "car [Year Model= " + getyearModel() + ", Car Make= " + getmake()
+ ", Speed = " + getspeed() + "]";
}
}

Here y you using another variable sum.If you changing the speed by brake n accelerator method u should use same variable to give current speed.
I think you must not initialize speed to zero.

Reply for more query !!!

Thank you! one problem though. I am supposed to display the speed each time the accelrate method is called and each time the brake method is called

Look at the how you did this: System.out.println(cc);

1. Use the

 Your code here

and format that properly in some editor.
2. Make a display function that will display what do you want to and call that function in accelerate and brake function.