* and {@link State#TERMINATED} states are terminal states, once a service enters either of these
 * states it cannot ever leave them.
 *
 * <p>Implementors of this interface are strongly encouraged to extend one of the abstract classes
 * in this package which implement this interface and make the threading and state management
 * easier.
 *
 * @author Jesse Wilson
 * @author Luke Sandberg
 * @since 9.0 (in 1.0 as {@code com.google.common.base.Service})

* `set`
* `dict`

Und Generics aus dem `typing`-Modul:

* `Union`
* `Optional`
* ... und andere.

////

### Klassen als Typen { #classes-as-types }

Sie können auch eine Klasse als Typ einer Variablen deklarieren.

Nehmen wir an, Sie haben eine Klasse `Person`, mit einem Namen:

{* ../../docs_src/python_types/tutorial010_py39.py hl[1:3] *}

# Object classes for LDAP admin user.
ldap.admin.user.object.classes=organizationalPerson,top,person,inetOrgPerson
# Role filter for LDAP admin.
ldap.admin.role.filter=cn\=%s
# Base DN for LDAP admin role.
ldap.admin.role.base.dn=ou\=Role,dc\=fess,dc\=codelibs,dc\=org
# Object classes for LDAP admin role.
ldap.admin.role.object.classes=groupOfNames
# Group filter for LDAP admin.

   *
   * <p><b>Java 25+ users:</b> If the input is a {@link Reader}, you may prefer {@link
   * Reader#readAllLines()}. The two may have different performance characteristics for different
   * {@link Reader} classes and Java versions, but both methods read the entire input into memory
   * immediately, so we discourage use of both when memory usage is a concern.
   *
   * @param r the object to read from

            The directory where compiled application classes are placed.
            The default value is {@code target/classes}.
          </description>
          <type>String</type>
        </field>
        <field>
          <name>testOutputDirectory</name>
          <version>4.0.0+</version>
          <description>
            The directory where compiled test classes are placed.

   * multimap based on arbitrary {@link Map} and {@link List} classes. Most users should prefer
   * {@link MultimapBuilder}, though a small number of users will need this method to cover map or
   * collection types that {@link MultimapBuilder} does not support.
   *
   * <p>The {@code factory}-generated and {@code map} classes determine the multimap iteration

 *
 * @param <B> The concrete type of this builder (the 'self-type'). All the Builder methods of this
 *     class (such as {@link #named}) return this type, so that Builder methods of more derived
 *     classes can be chained onto them without casting.
 * @param <G> The type of the generator to be passed to testers in the generated test suite. An
 *     instance of G should somehow provide an instance of the class under test, plus any other

 */
abstract class AbstractBaseGraph<N> implements BaseGraph<N> {

  /**
   * Returns the number of edges in this graph; used to calculate the size of {@link Graph#edges()}.
   * This implementation requires O(|N|) time. Classes extending this one may manually keep track of
   * the number of edges as the graph is updated, and override this method for better performance.
   */
  protected long edgeCount() {
    long degreeSum = 0L;

import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
import java.util.concurrent.ConcurrentSkipListMap;
import org.jspecify.annotations.NullUnmarked;

/**
 * Helper classes for various benchmarks.
 *
 * @author Christopher Swenson
 */
@NullUnmarked
final class BenchmarkHelpers {
  /** So far, this is the best way to test various implementations of {@link Set} subclasses. */

        assertEquals(
                new File(pom.getBasedir(), "target/classes"),
                new File(pom.getValue("properties/buildMainOut").toString()));
        assertEquals(
                new File(pom.getBasedir(), "target/test-classes"),
                new File(pom.getValue("properties/buildTestOut").toString()));
        assertEquals(