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49 lines
1.5 KiB
49 lines
1.5 KiB
1 year ago
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## StarStatic
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### Instructions
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Let's add some computation.
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Our objective is to compute the distance between celestial objects. As you may have guessed, the x, y and z values are the coordinates of the object. Their unit is AU (Astronomical Unit) which is 150 000 000 km.
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We will add two `static` and `public` method :
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- `getDistanceBetween` which takes two CelestialObject as parameters and returns a double corresponding to the distance between the two objects.
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- `getDistanceBetweenInKm` which takes two CelestialObject as parameters and returns a double corresponding to the distance in km between the two objects.
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We add a public constant double property, named `KM_IN_ONE_AU` with the value of 150 000 000.
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### Usage
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Here is a possible ExerciseRunner.java to test your function :
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```java
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public class ExerciseRunner {
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public static void main(String[] args) {
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CelestialObject defaultStar = new CelestialObject();
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CelestialObject earth = new CelestialObject("Terre", 1.0, 2.0, 2.0);
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System.out.println(CelestialObject.getDistanceBetween(defaultStar, earth));
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System.out.println(CelestialObject.getDistanceBetweenInKm(defaultStar, earth));
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System.out.println(CelestialObject.KM_IN_ONE_AU);
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}
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}
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```
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and its output :
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```shell
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$ javac *.java -d build
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$ java -cp build ExerciseRunner
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3.0
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4.5E8
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1.5E8
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$
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```
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### Notions
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[Class Member / Static](https://docs.oracle.com/javase/tutorial/java/javaOO/classvars.html)
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[Math](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Math.html)
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