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51 lines
1.2 KiB
51 lines
1.2 KiB
1 year ago
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## StarOverride
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### Instructions
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In the `Star` class, let's add a new constructor with the following arguments :
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* the `name`
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* the position `x`
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* the position `y`
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* the position `z`
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* the `magnitude`
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It calls the constructor of the superclass `CelestialObject`.
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We will override the `hashCode` and `equals`, using the `magnitude` property.
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Finally, we rewrite the `toString` method. The returned String must have the following format : `<name> shines at the <magnitude> magnitude`
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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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Star star = new Star();
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Star star2 = new Star();
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Star proxima = new Star("Proxima", 18.389, 832.32, 218, 0.4);
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System.out.println(star.toString());
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System.out.println(proxima.toString());
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System.out.println(star.equals(star2));
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System.out.println(star.equals(proxima));
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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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Soleil shines at the 0.000 magnitude
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Proxima shines at the 0.400 magnitude
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true
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false
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$
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```
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### Notions
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[Override](https://docs.oracle.com/javase/tutorial/java/IandI/override.html)
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