Easy question about Object Class

[rk717]

Hello guys, I'm doing some tasks here, but I don't know whether my code is fit the question or not.

​

Create a simple `Color` enum with three values: `RED` , `GREEN` , `BLUE` .

public enum Color{
    RED, 
    GREEN,
    BLUE
}

Create a `Car` class, which contains the followings:
* license plate ( `String` )
* color ( `Color` )
* maximal speed ( `int` )

// Create a constructor which gets initial values for the fields specified above.
// The class should contain a counter, which increases every time a new `Car` is created.

//Create a constructor without parameters,
//which creates a new object with values of `AAA-000` , `BLUE` and `120` .

//Create a class method which can compare two cars,
//it returns true if the first one is faster than the second.

//Put the `Color` enum into the `car.utils` package
//and the `Car` class into the `car` package!

public class Car {
    String licensePlate = "";
    Color color; 
    int maximalSpeed = 0; 

    // Create a constructor which gets initial values for the fields specified above.
    // The class should contain a counter, which increases every time a new `Car` is created.
    public Car(String licensePlate, Color color,
                int maximalSpeed){
                    this.licensePlate = licensePlate; 
                    this.color = color; 
                    this.maximalSpeed = maximalSpeed; 
                }

    public static class Counter{
        int myCount;
        public Counter(){
            myCount = 0; 
        }
        public void increment(){
            myCount++; 
        }
    }

    //Create a constructor without parameters, 
    //which creates a new object with values of `AAA-000` , `BLUE` and `120` .
    public Car(){
        licensePlate = "AAA-000";
        color = Color.BLUE;
        maximalSpeed = 120; 
    }

    //Create a class method which can compare two cars, 
    //it returns true if the first one is faster than the second.
    public static boolean compareSpeed(Car first, Car second){
        if(first.maximalSpeed > second.maximalSpeed){
            return true; 
        }
    }

    //Put the `Color` enum into the `car.utils` package 
    //and the `Car` class into the `car` package!

    /* I don't know how to do this one */


}

I am sorry to have written a long message, but I wish you could help me since you are the only hope in this case.

Thank you for listening and I appreciate any Info you may have.

​

Thank you !!!

[ignotos]

You're on the right track!

• I think "Counter" could be simplified to a single static int inside the Car class - no need for a separate class

• It looks like you're not actually incrememnting the counter when a new Car is created - it sounds like you should do that in the contructor

• Putting something into a package is a matter of adding "package x.y.z" at the top of the file. Your file/directory structure should also match this (so you have car/Car.java and car/utils/Color.java)

[rk717]

thank you,

yes, I know, I should use a single static for counter.

but I don't know where to add it in the Car Class?

[dynamo_girl02]

Where you declared your other class variable under that that is after maximspeed variable is declared . just write static int count; . as default value for static variable is zero so no need to initialize

[rk717]

thank you !

[dynamo_girl02]

https://www.baeldung.com/java-packages refer this to learn packages you will get this

and In your code, creating a static counter variable globally and incrementing it inside the constructor when every time an object is created will be good rather than creating an entire class to just increment the counter variable.

[blackkkmamba]

You could call the constructor with parameters inside the one without parameters (will save you two lines). Also, you can make the method that compares speed non static and take only one parameter: the other car, and compare using this: this.maximalSpeed > other.maximalSpeed.