OnJava8-Examples/enumerations/Planets.java at master · CSapprenticeWT/OnJava8-Examples · GitHub

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// enumerations/Planets.java

// We make no guarantees that this code is fit for any purpose.

// Visit http://OnJava8.com for more book information.

// {NewFeature} Since JDK 14

enum CelestialBody {

MERCURY, VENUS, EARTH, MARS, JUPITER,

SATURN, URANUS, NEPTUNE, PLUTO

}

public class Planets {

public static String classify(CelestialBody b) {

var result = switch(b) {

case MERCURY, VENUS, EARTH,

MARS, JUPITER,

SATURN, URANUS, NEPTUNE -> {

System.out.print("A planet: ");

yield b.toString();

}

case PLUTO -> {

System.out.print("Not a planet: ");

yield b.toString();

}

};

return result;

}

public static void main(String[] args) {

System.out.println(classify(CelestialBody.MARS));

System.out.println(classify(CelestialBody.PLUTO));

}

/* Output:

A planet: MARS

Not a planet: PLUTO