---

"_I’m over the moon excited about **FastAPI**. It’s so fun!_"

<div style="text-align: right; margin-right: 10%;">Brian Okken - <strong><a href="https://pythonbytes.fm/episodes/show/123/time-to-right-the-py-wrongs?time_in_sec=855" target="_blank">Python Bytes</a> podcast host</strong> <a href="https://twitter.com/brianokken/status/1112220079972728832" target="_blank"><small>(ref)</small></a></div>

---

  public void testNullPointers() {
    NullPointerTester tester = new NullPointerTester();
    tester.testAllPublicStaticMethods(ImmutableList.class);
    tester.testAllPublicInstanceMethods(ImmutableList.of(1, 2, 3));
  }

  @J2ktIncompatible
  @GwtIncompatible // SerializableTester
  public void testSerialization_empty() {
    Collection<String> c = ImmutableList.of();

---

"_Я в полном восторге от **FastAPI**. Это так весело!_"

<div style="text-align: right; margin-right: 10%;">Brian Okken - <strong><a href="https://pythonbytes.fm/episodes/show/123/time-to-right-the-py-wrongs?time_in_sec=855" target="_blank">Python Bytes</a> podcast host</strong> <a href="https://twitter.com/brianokken/status/1112220079972728832" target="_blank"><small>(ref)</small></a></div>

---

---

"_আমি **FastAPI** নিয়ে চাঁদের সমান উৎসাহিত। এটি খুবই মজার!_"

<div style="text-align: right; margin-right: 10%;">ব্রায়ান ওকেন - <strong><a href="https://pythonbytes.fm/episodes/show/123/time-to-right-the-py-wrongs?time_in_sec=855" target="_blank">পাইথন বাইটস</a> পডকাস্ট হোস্ট</strong> <a href="https://twitter.com/brianokken/status/1112220079972728832" target="_blank"><small>(ref)</small></a></div>

---

---

"_I’m over the moon excited about **FastAPI**. It’s so fun!_"

<div style="text-align: right; margin-right: 10%;">Brian Okken - <strong><a href="https://pythonbytes.fm/episodes/show/123/time-to-right-the-py-wrongs?time_in_sec=855" target="_blank">Python Bytes</a> podcast host</strong> <a href="https://twitter.com/brianokken/status/1112220079972728832" target="_blank"><small>(ref)</small></a></div>

---

* `Set`
* `Dict`
* `Optional`
* ...など

**ジェネリック型** または **ジェネリクス** と呼びます。

### 型としてのクラス

変数の型としてクラスを宣言することもできます。

例えば、`Person`クラスという名前のクラスがあるとしましょう:

```Python hl_lines="1 2 3"
{!../../docs_src/python_types/tutorial010.py!}
```

変数の型を`Person`として宣言することができます:

```Python hl_lines="6"
{!../../docs_src/python_types/tutorial010.py!}
```

そして、再び、すべてのエディタのサポートを得ることができます:

---

"*Estou extremamente entusiasmado com o **FastAPI**. É tão divertido!*"

<div style="text-align: right; margin-right: 10%;">Brian Okken - <strong><a href="https://pythonbytes.fm/episodes/show/123/time-to-right-the-py-wrongs?time_in_sec=855" target="_blank">Python Bytes</a> podcaster</strong> <a href="https://twitter.com/brianokken/status/1112220079972728832" target="_blank"><small>(ref)</small></a></div>

---

---

"_I’m over the moon excited about **FastAPI**. It’s so fun!_"

<div style="text-align: right; margin-right: 10%;">Brian Okken - <strong><a href="https://pythonbytes.fm/episodes/show/123/time-to-right-the-py-wrongs?time_in_sec=855" target="_blank">Python Bytes</a> podcast host</strong> <a href="https://twitter.com/brianokken/status/1112220079972728832" target="_blank"><small>(ref)</small></a></div>

---

      hash += Ints.hashCode(array[i]);
    }
    return hash;
  }

  /**
   * Returns a string representation of this array in the same form as {@link
   * Arrays#toString(int[])}, for example {@code "[1, 2, 3]"}.
   */
  @Override
  public String toString() {
    if (isEmpty()) {
      return "[]";
    }
    StringBuilder builder = new StringBuilder(length() * 5); // rough estimate is fine

		// cases which should pass the test.
		// passing in valid bucket names.
		{"lol", true},
		{"1-this-is-valid", true},
		{"1-this-too-is-valid-1", true},
		{"this.works.too.1", true},
		{"1234567", true},
		{"123", true},
		{"s3-eu-west-1.amazonaws.com", true},
		{"ideas-are-more-powerful-than-guns", true},
		{"testbucket", true},
		{"1bucket", true},
		{"bucket1", true},
		{"a.b", true},
		{"ab.a.bc", true},