SmallTalk ifTrue ifFalse implementation in Java for my Programming Styles class
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import java.util.concurrent.ThreadLocalRandom; | |
import java.util.function.Supplier; | |
public abstract class Bool { | |
public static final Bool TRUE = new True(); | |
public static final Bool FALSE = new False(); | |
public abstract <T> T ifTrueIfFalse(Supplier<T> fTrue, Supplier<T> fFalse); | |
private static class True extends Bool { | |
public <T> T ifTrueIfFalse(Supplier<T> fTrue, Supplier<T> fFalse) { | |
return fTrue.get(); | |
} | |
} | |
private static class False extends Bool { | |
public <T> T ifTrueIfFalse(Supplier<T> fTrue, Supplier<T> fFalse) { | |
return fFalse.get(); | |
} | |
} | |
public static void main(String[] args) { | |
System.out.printf("TRUE: %s\n", | |
Bool.TRUE.ifTrueIfFalse(() -> "yes", () -> "oops")); | |
System.out.printf("FALSE: %s\n", | |
Bool.FALSE.ifTrueIfFalse(() -> "yes", () -> "oops")); | |
Bool condition = ThreadLocalRandom.current().nextInt(0, 2) == 0 | |
? Bool.FALSE | |
: Bool.TRUE; | |
System.out.printf("%s: %s\n", | |
condition.getClass().getName(), | |
condition.ifTrueIfFalse(() -> "yes", () -> "oops")); | |
} | |
} |
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