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KDF hkdf = KDF.getInstance("HKDF-SHA256");
AlgorithmParameterSpec params =
    HKDFParameterSpec.ofExtract()
        .addIKM("the super secret passphrase".getBytes(StandardCharsets.UTF_8))
        .addSalt("the salt".getBytes(StandardCharsets.UTF_8))
        .thenExpand("my derived key description".getBytes(StandardCharsets.UTF_8), 32);

SecretKey key = hkdf.deriveKey("AES", params);

System.out.println("key = " + HexFormat.of().formatHex(key.getEncoded()));

public Person(int age) {
    if (value <= 0)
        throw new IllegalArgumentException("non-positive value");
    super(value);
}

var name = "Duke";
var info = STR."My name is {name}";

System.out.println(info);

Random r = new Random();

try (var scope = new StructuredTaskScope.ShutdownOnFailure()) {
    Supplier<Integer> number1  = scope.fork(r::nextInt);
    Supplier<Integer> number2 = scope.fork(r::nextInt);

    try {
        scope.join().throwIfFailed();
        System.out.println(number1.get());
        System.out.println(number2.get());

    } catch (ExecutionException | InterruptedException e) {
        throw new RuntimeException(e);
    }

}

ScopedValue.where(NAME, "Ada").run(() ->
          System.out.println(NAME.get()));

ScopedValue.where(NAME, "Aixa").run(() ->
          System.out.println(NAME.get()));

private static final ScopedValue<String> NAME = ScopedValue.newInstance();