# Classes as Dependencies { #classes-as-dependencies }

Before diving deeper into the **Dependency Injection** system, let's upgrade the previous example.

## A `dict` from the previous example { #a-dict-from-the-previous-example }

In the previous example, we were returning a `dict` from our dependency ("dependable"):

{* ../../docs_src/dependencies/tutorial001_an_py310.py hl[9] *}

            java: 21
            root-pom: pom.xml
    runs-on: ${{ matrix.os }}
    env:
      ROOT_POM: ${{ matrix.root-pom }}
    steps:
      # Cancel any previous runs for the same branch that are still running.
      - name: 'Cancel previous runs'
        uses: styfle/cancel-workflow-action@85880fa0301c86cca9da44039ee3bb12d3bedbfa # 0.12.1
        with:
          access_token: ${{ github.token }}

    }

    @CanIgnoreReturnValue
    RoundToDoubleTester setExpectation(double expectedValue, RoundingMode... modes) {
      for (RoundingMode mode : modes) {
        Double previous = expectedValues.put(mode, expectedValue);
        if (previous != null) {
          throw new AssertionError();
        }
      }
      return this;
    }

    @CanIgnoreReturnValue
    RoundToDoubleTester roundUnnecessaryShouldThrow() {

 * <p>
 * This class now uses the standard {@link java.util.Base64} implementation
 * instead of a custom implementation, providing better security and performance.
 * The API remains backward compatible with previous versions.
 * </p>
 *
 * @author higa
 */
public abstract class Base64Util {

    /**
     * Do not instantiate.
     */
    protected Base64Util() {
    }

    /**

</div>
<div class="row">
	<nav id="subfooter" class="mx-auto">
		<ul class="pagination justify-content-center">
			<c:if test="${existPrevPage}">
				<li class="page-item"><la:link styleClass="page-link" aria-label="Previous"
						href="/search/prev?q=${f:u(q)}&pn=${f:u(currentPageNumber)}&num=${f:u(pageSize)}&sdh=${f:u(fe:sdh(sdh))}${fe:pagingQuery(null)}${fe:facetQuery()}${fe:geoQuery()}">
						<span aria-hidden="true">&laquo;</span>

        saveToken();
        return doSearch(form);
    }

    /**
     * Navigates to the previous page of search results.
     *
     * @param form the list form containing current search criteria
     * @return HTML response with previous page results
     */
    @Execute
    @Secured({ ROLE, ROLE + VIEW })
    public HtmlResponse prev(final ListForm form) {

And also the docs about <a href="https://strawberry.rocks/docs/integrations/fastapi" class="external-link" target="_blank">Strawberry with FastAPI</a>.

## Older `GraphQLApp` from Starlette { #older-graphqlapp-from-starlette }

Previous versions of Starlette included a `GraphQLApp` class to integrate with <a href="https://graphene-python.org/" class="external-link" target="_blank">Graphene</a>.

        // Apply each converter in sequence
        for (final ReadingConverter converter : converters) {
            final List<String> nextInputs = new ArrayList<>();

            // Process each input from the previous converter
            for (final String input : currentInputs) {
                if (resultSet.size() >= getMaxReadingNum()) {
                    break;
                }

///

## Shortcut to remember the names { #shortcut-to-remember-the-names }

Let's see the previous example again:

{* ../../docs_src/response_status_code/tutorial001_py39.py hl[6] *}

`201` is the status code for "Created".

But you don't have to memorize what each of these codes mean.

         * @return the total page count
         */
        public int getAllPageCount() {
            return allPageCount;
        }

        /**
         * Checks if a previous page exists.
         *
         * @return true if there is a previous page, false otherwise
         */
        public boolean isExistPrePage() {
            return currentPageNumber != 1;
        }

        /**