*   protected void visitWildcardType(WildcardType t) {
 *     throw new IllegalArgumentException("Cannot contain wildcard type.");
 *   }
 * }.visit(type);
 * }
 *
 * <p>One {@code Type} is visited at most once. The second time the same type is visited, it's
 * ignored by {@link #visit}. This avoids infinite recursion caused by recursive type bounds.
 *
 * <p>This class is not thread safe.
 *
 * @author Ben Yu
 */

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

Here, `new_dict` will contain all the key-value pairs from `old_dict` plus the new key-value pair:

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

        assertEquals("foo/", r1.getName(), "First child name should match with trailing slash");

        assertTrue(it.hasNext(), "Expected second element available");
        SmbResource r2 = it.next();
        assertNotNull(r2);
        assertEquals("bar/", r2.getName(), "Second child name should match with trailing slash");

        // End of iteration behavior
        assertFalse(it.hasNext(), "No more elements expected");

        int result = smbComRename.writeBytesWireFormat(dst, dstIndex);

        // Then
        assertTrue(result > 0);
        assertEquals((byte) 0x04, dst[0]); // First buffer format byte

        // Find the second buffer format byte
        int secondBufferFormatIndex = oldFileName.length() + 2; // 1 for first 0x04, 1 for null terminator
        assertEquals((byte) 0x04, dst[secondBufferFormatIndex]);
    }

    /**

        assertThrows(IllegalStateException.class, () -> {
            Handler.setURLStreamHandlerFactory(mockFactory2); // Second call, should fail.
        }, "Setting the factory a second time should throw IllegalStateException.");
    }

    @Test
    void testOpenConnection_WithCustomFactory() throws Exception {

        }
    }

    /**
     * Validates integer for safe arithmetic operations
     *
     * @param a first operand
     * @param b second operand
     * @param operation the operation name
     * @throws ArithmeticException if operation would overflow
     */
    public static void validateIntegerAddition(int a, int b, String operation) {

     */
    protected ObjectUtil() {
    }

    /**
     * Returns true if the two objects are equal, or both are null.
     *
     * @param object1 the first object
     * @param object2 the second object
     * @return true if equal or both null, false otherwise
     */
    public static boolean equals(final Object object1, final Object object2) {
        if (object1 == object2) {
            return true;
        }

        assertTrue(it.hasNext(), "Iterator should have second element");
        assertSame(fe2, it.next(), "Second element must match first page");

        // Next page fetched via fetchMore()
        assertTrue(it.hasNext(), "Iterator should have third element after fetchMore");
        assertSame(fe3, it.next(), "Third element from second page");

        return ordinal() <= v.ordinal();
    }

    /**
     * Get the minimum of two dialect versions
     *
     * @param a the first version to compare
     * @param b the second version to compare
     * @return smaller of the two versions
     */
    public static DialectVersion min(final DialectVersion a, final DialectVersion b) {
        if (a.atMost(b)) {
            return a;
        }

        bb.getInt();

        // LinkSpeed (8 bytes) - in bits per second
        long linkSpeedBps = bb.getLong();

        // Parse sockaddr structure (starts at offset + 24)
        InetAddress addr = parseSockaddr(data, offset + 24);

        if (addr == null) {
            return null;
        }

        // Convert bits per second to Mbps for internal use