public/subjects/java-piscine/StarOverride

StarOverride

Instructions

In the Star class, let's add a new constructor with the following arguments :

• the name
• the position x
• the position y
• the position z
• the magnitude
  It calls the constructor of the superclass CelestialObject.

We will override the hashCode and equals, using the magnitude property.

Finally, we rewrite the toString method. The returned String must have the following format : <name> shines at the <magnitude> magnitude

Usage

Here is a possible ExerciseRunner.java to test your function :

public class ExerciseRunner {

    public static void main(String[] args) {
        Star star = new Star();
        Star star2 = new Star();
        Star proxima = new Star("Proxima", 18.389, 832.32, 218, 0.4);
        
        System.out.println(star.toString());
        System.out.println(proxima.toString());
        System.out.println(star.equals(star2));
        System.out.println(star.equals(proxima));
    }
}

and its output :

$ javac *.java -d build
$ java -cp build ExerciseRunner 
Soleil shines at the 0.000 magnitude
Proxima shines at the 0.400 magnitude
true
false
$ 

Notions

Override