```Python hl_lines="20-37  39-40"
{!../../docs_src/path_operation_advanced_configuration/tutorial006.py!}
```

 * </pre>
 *
 * @author Ben Yu
 * @since 12.0
 */
@ElementTypesAreNonnullByDefault
public abstract class AbstractInvocationHandler implements InvocationHandler {

  private static final Object[] NO_ARGS = {};

  /**
   * {@inheritDoc}
   *
   * <ul>
   *   <li>{@code proxy.hashCode()} delegates to {@link AbstractInvocationHandler#hashCode}

import org.checkerframework.checker.nullness.qual.Nullable;

/** Replacements for JUnit's {@code assertThrows} that work under GWT/J2CL. */
@GwtCompatible(emulated = true)
@ElementTypesAreNonnullByDefault
final class ReflectionFreeAssertThrows {
  interface ThrowingRunnable {
    void run() throws Throwable;
  }

  interface ThrowingSupplier {
    @Nullable Object get() throws Throwable;
  }

  @CanIgnoreReturnValue

public class FloatsTest extends TestCase {
  private static final float[] EMPTY = {};
  private static final float[] ARRAY1 = {(float) 1};
  private static final float[] ARRAY234 = {(float) 2, (float) 3, (float) 4};

  private static final float LEAST = Float.NEGATIVE_INFINITY;
  private static final float GREATEST = Float.POSITIVE_INFINITY;

  private static final float[] NUMBERS =
      new float[] {
        LEAST,

public class DoublesTest extends TestCase {
  private static final double[] EMPTY = {};
  private static final double[] ARRAY1 = {(double) 1};
  private static final double[] ARRAY234 = {(double) 2, (double) 3, (double) 4};

  private static final double LEAST = Double.NEGATIVE_INFINITY;
  private static final double GREATEST = Double.POSITIVE_INFINITY;

  private static final double[] NUMBERS =
      new double[] {
        LEAST,

public class FloatsTest extends TestCase {
  private static final float[] EMPTY = {};
  private static final float[] ARRAY1 = {(float) 1};
  private static final float[] ARRAY234 = {(float) 2, (float) 3, (float) 4};

  private static final float LEAST = Float.NEGATIVE_INFINITY;
  private static final float GREATEST = Float.POSITIVE_INFINITY;

  private static final float[] NUMBERS =
      new float[] {
        LEAST,

 * limitations under the License.
 */

package com.google.common.base;

/** Class containing an unannotated Java method for use from {@code OptionalExtensionsTest}. */
final class UnannotatedJavaClass {
  static Object getNull() {
    return null;
  }

  private UnannotatedJavaClass() {}

 * limitations under the License.
 */

package com.google.common.cache;

/**
 * GWT emulation for LongAddables.
 *
 * @author Louis Wasserman
 */
final class LongAddables {
  public static LongAddable create() {
    return new LongAdder();
  }

  private static final class PickyIterable<E> implements Iterable<E> {
    final List<E> elements;
    int modCount = 0;

    PickyIterable(E... elements) {
      this.elements = new ArrayList<E>(asList(elements));
    }

    @Override
    public Iterator<E> iterator() {
      return new PickyIterator();
    }

    final class PickyIterator implements Iterator<E> {

import org.checkerframework.checker.nullness.qual.Nullable;

/** Replacements for JUnit's {@code assertThrows} that work under GWT/J2CL. */
@GwtCompatible(emulated = true)
@ElementTypesAreNonnullByDefault
final class ReflectionFreeAssertThrows {
  interface ThrowingRunnable {
    void run() throws Throwable;
  }

  interface ThrowingSupplier {
    @Nullable Object get() throws Throwable;
  }

  @CanIgnoreReturnValue