Answer:
public class Car {
    private String __year_model;
    private String __make;
    private int __speed;
    //Creating the constructor
    public Car(String __year_model, String __make, int __speed) {
        this.__year_model = __year_model;
        this.__make = __make;
        this.__speed = __speed;
    }
    //Creatining the set and get methods
    public String get__year_model() {
        return __year_model;
    }
    public void set__year_model(String __year_model) {
        this.__year_model = __year_model;
    }
    public String get__make() {
        return __make;
    }
    public void set__make(String __make) {
        this.__make = __make;
    }
    public int get__speed() {
        return __speed;
    }
    public void set__speed(int __speed) {
        this.__speed = __speed;
    }
}
Explanation:
As stated in the question, The class Car is created using Java programming language with the three attributes year_model, make and speed.
Constructors as well as set and get methods were also created for each of the fields.