* @since 18.0 (since 3.0 as {@code Objects.firstNonNull()}).
   */
  public static <T> T firstNonNull(@Nullable T first, @Nullable T second) {
    if (first != null) {
      return first;
    }
    if (second != null) {
      return second;
    }
    throw new NullPointerException("Both parameters are null");
  }

  /**
   * Creates an instance of {@link ToStringHelper}.
   *

        TestScriptEngine engine1 = new TestScriptEngine("first");
        TestScriptEngine engine2 = new TestScriptEngine("second");

        scriptEngineFactory.add("test", engine1);
        scriptEngineFactory.add("test", engine2);

        // Should get the second engine
        ScriptEngine retrieved = scriptEngineFactory.getScriptEngine("test");
        assertEquals(engine2, retrieved);
    }

import static com.google.common.util.concurrent.MoreExecutors.directExecutor;
import static java.util.concurrent.Executors.newScheduledThreadPool;
import static java.util.concurrent.TimeUnit.SECONDS;
import static org.junit.Assert.assertThrows;

import com.google.common.annotations.GwtCompatible;
import com.google.common.annotations.GwtIncompatible;
import com.google.common.annotations.J2ktIncompatible;

```Python
old_dict = {
    "old key": "old value",
    "second old key": "second old value",
}
new_dict = {**old_dict, "new key": "new value"}
```

Ici, `new_dict` contiendra toutes les paires clé-valeur de `old_dict` plus la nouvelle paire clé-valeur :

```Python
{
    "old key": "old value",
    "second old key": "second old value",
    "new key": "new value",
}
```

  @CanIgnoreReturnValue
  public final <A extends Appendable> A appendTo(
      A appendable, @Nullable Object first, @Nullable Object second, @Nullable Object... rest)
      throws IOException {
    return appendTo(appendable, iterable(first, second, rest));
  }

  /**
   * Appends the string representation of each of {@code parts}, using the previously configured

    /** List of JVM options to apply when executing the job */
    protected List<String> jvmOptions = new ArrayList<>();

    /** Lasta environment configuration */
    protected String lastaEnv;

    /** Timeout in seconds for job execution (-1 means no timeout) */
    protected int timeout = -1; // sec

    /** Flag indicating whether the process has timed out */
    protected boolean processTimeout = false;

    /**

    enableProtocol(protocol)

    server.enqueue(
      MockResponse
        .Builder()
        .trailers(headersOf("t1", "v2"))
        .bodyDelay(1, TimeUnit.SECONDS)
        .body(protocol, "Hello")
        .build(),
    )

    val call = client.newCall(Request(server.url("/")))
    call.execute().use { response ->
      response.close()

        // Second decode - should overwrite values
        byte[] buffer2 = new byte[50];
        SMBUtil.writeInt4(0x22222222, buffer2, 0);
        SMBUtil.writeInt2(0x2222, buffer2, 20);
        SMBUtil.writeInt2(0x0311, buffer2, 22);

        response.decode(buffer2, 0, 24);
        assertEquals(0x22222222, response.getCapabilities(), "Second decode capabilities");

        assertEquals(sidT1, lsarSidArrayX.sids[0].sid, "First SID should be unwrapped correctly");
        assertEquals(sidT2, lsarSidArrayX.sids[1].sid, "Second SID should be unwrapped correctly");
    }

    @Test
    void testConstructorWithJcifsSIDArrayDirectAssignment() {
        // Create mock SID objects
        SID mockSid1 = mock(SID.class);

    }

    @Test
    @DisplayName("Iterator with rejecting filter - finds next acceptable")
    void iteratorWithRejectingFilter() throws Exception {
        // Setup: first entry rejected, second accepted
        FileEntry entry1 = mock(FileEntry.class);
        FileEntry entry2 = mock(FileEntry.class);

        when(delegate.hasNext()).thenReturn(true, true, false);