OnJava8-Examples/enumerations/PetPatternMatch2.java at master · CSapprenticeWT/OnJava8-Examples · GitHub

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// enumerations/PetPatternMatch2.java

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

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

// {NewFeature} Preview in JDK 17

// Compile with javac flags:

// --enable-preview --source 17

package sealedpet;

import java.util.*;

sealed interface Pet {

void feed();

}

final class Dog implements Pet {

@Override public void feed() {}

void walk() {}

}

final class Fish implements Pet {

@Override public void feed() {}

void changeWater() {}

}

public class PetPatternMatch2 {

static void careFor(Pet p) {

switch(p) {

case Dog d -> d.walk();

case Fish f -> f.changeWater();

};

}

static void petCare() {

List.of(new Dog(), new Fish())

.forEach(p -> careFor(p));

}