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

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// enumerations/Dominance.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

import java.util.*;

sealed interface Base {}

record Derived() implements Base {}

public class Dominance {

static String test(Base base) {

return switch(base) {

case Derived d -> "Derived";

case Base b -> "B"; // [1]

};

}