使用 JavaTuples 在Java中从 Octet 类实现 Ennead 类

在Java中，我们可以使用JavaTuples库来实现元组(Tuple)类型。一个元组包含有限数量的元素，可以用来存储一组相关的数据。JavaTuples库提供了从单元素到十元素的不同类型的元组实现。这个库可以方便地在Java中使用元组来传递参数或从方法返回多个值。

在本文中，我们将介绍如何使用JavaTuples库从一个八元组(Octet)类实现九元组(Ennead)类。我们将首先介绍JavaTuples的基本用法，然后说明如何扩展JavaTuples库提供的元组类型。

JavaTuples基本用法

我们可以使用以下方法创建不同数量的元组：

Unit<String> unit = Unit.with("Hello");

Pair<String, Integer> pair = Pair.with("A", 1);

Triplet<String, Integer, Double> triplet = Triplet.with("A", 1, 2.0);

Quartet<String, Integer, Double, Boolean> quartet = Quartet.with("A", 1, 2.0, true);

Quintet<String, Integer, Double, Boolean, Long> quintet = Quintet.with("A", 1, 2.0, true, 100L);

Sextet<String, Integer, Double, Boolean, Long, Short> sextet = Sextet.with("A", 1, 2.0, true, 100L, (short) 2);

Septet<String, Integer, Double, Boolean, Long, Short, Float> septet = Septet.with("A", 1, 2.0, true, 100L, (short) 2, 2.0f);

Octet<String, Integer, Double, Boolean, Long, Short, Float, Character> octet = Octet.with("A", 1, 2.0, true, 100L, (short) 2, 2.0f, 'A');

我们可以使用以下方法来访问元组中的值:

String a = pair.getValue0();
Integer b = pair.getValue1();

String c = triplet.getValue0();
Integer d = triplet.getValue1();
Double e = triplet.getValue2();

String f = quartet.getValue0();
Integer g = quartet.getValue1();
Double h = quartet.getValue2();
Boolean i = quartet.getValue3();

String j = quintet.getValue0();
Integer k = quintet.getValue1();
Double l = quintet.getValue2();
Boolean m = quintet.getValue3();
Long n = quintet.getValue4();

String o = sextet.getValue0();
Integer p = sextet.getValue1();
Double q = sextet.getValue2();
Boolean r = sextet.getValue3();
Long s = sextet.getValue4();
Short t = sextet.getValue5();

String u = septet.getValue0();
Integer v = septet.getValue1();
Double w = septet.getValue2();
Boolean x = septet.getValue3();
Long y = septet.getValue4();
Short z = septet.getValue5();
Float aa = septet.getValue6();

String bb = octet.getValue0();
Integer cc = octet.getValue1();
Double dd = octet.getValue2();
Boolean ee = octet.getValue3();
Long ff = octet.getValue4();
Short gg = octet.getValue5();
Float hh = octet.getValue6();
Character ii = octet.getValue7();

我们也可以使用以下方法来创建和访问元组中的值的别名:

String a = pair.component1();
Integer b = pair.component2();

String c = triplet.getValue0();
Integer d = triplet.getValue1();
Double e = triplet.getValue2();

String f = quartet.getValue0();
Integer g = quartet.getValue1();
Double h = quartet.getValue2();
Boolean i = quartet.getValue3();

String j = quintet.getValue0();
Integer k = quintet.getValue1();
Double l = quintet.getValue2();
Boolean m = quintet.getValue3();
Long n = quintet.getValue4();

String o = sextet.getValue0();
Integer p = sextet.getValue1();
Double q = sextet.getValue2();
Boolean r = sextet.getValue3();
Long s = sextet.getValue4();
Short t = sextet.getValue5();

String u = septet.getValue0();
Integer v = septet.getValue1();
Double w = septet.getValue2();
Boolean x = septet.getValue3();
Long y = septet.getValue4();
Short z = septet.getValue5();
Float aa = septet.getValue6();

String bb = octet.getValue0();
Integer cc = octet.getValue1();
Double dd = octet.getValue2();
Boolean ee = octet.getValue3();
Long ff = octet.getValue4();
Short gg = octet.getValue5();
Float hh = octet.getValue6();
Character ii = octet.getValue7();

以上代码将创建一个名称为“a”的String变量来存储pair中第一个元素的值，创建一个名称为“b”的Integer变量来存储pair中第二个元素的值。对于Triplet、Quartet、Quintet、Sextet、Septet、Octet中的元素也有相应的变量名。

扩展JavaTuples库提供的元组类型

JavaTuples库提供的元组类型可以满足大多数业务需求，但在某些情况下需要自定义一个新的元组类型。我们可以通过继承JavaTuples库提供的元组类型来实现自定义元组类型。以下是一个从Octet类扩展到Ennead类的示例：

public class Ennead<A, B, C, D, E, F, G, H, I> extends Octet<A, B, C, D, E, F, G, H> {

    private static final long serialVersionUID = 1L;

    private final I ninth;

    public Ennead(final A a, final B b, final C c, final D d, final E e, final F f, final G g, final H h, final I i) {
        super(a, b, c, d, e, f, g, h);
        ninth = i;
    }

    public I getNinth() {
        return ninth;
    }

    /*
     * 使用以下方法覆盖Octet类的endsWith方法。新增第九个元素
     */
    public boolean endsWith(final I ninth) {
        return this.ninth.equals(ninth);
    }

    /*
     * 重写Object类的hashCode()方法和equals()方法。
     */
    @Override
    public int hashCode() {
        return Objects.hash(
                getValue0(),
                getValue1(),
                getValue2(),
                getValue3(),
                getValue4(),
                getValue5(),
                getValue6(),
                getValue7(),
                ninth
        );
    }

    @Override
    public boolean equals(final Object o) {
        if (this == o) {
            return true;
        }
        if (!(o instanceof Ennead)) {
            return false;
        }
        final Ennead<?, ?, ?, ?, ?, ?, ?, ?, ?> that = (Ennead<?, ?, ?, ?, ?, ?, ?, ?, ?>) o;
        return Objects.equals(getValue0(), that.getValue0()) &&
                Objects.equals(getValue1(), that.getValue1()) &&
                Objects.equals(getValue2(), that.getValue2()) &&
                Objects.equals(getValue3(), that.getValue3()) &&
                Objects.equals(getValue4(), that.getValue4()) &&
                Objects.equals(getValue5(), that.getValue5()) &&
                Objects.equals(getValue6(), that.getValue6()) &&
                Objects.equals(getValue7(), that.getValue7()) &&
                Objects.equals(ninth, that.ninth);
    }

    /*
     * 重写Object类的toString()方法并包含第九个元素的值
     */
    @Override
    public String toString() {
        return "Ennead{" +
                "fisrt=" + getValue0() +
                ", second=" + getValue1() +
                ", third=" + getValue2() +
                ", fourth=" + getValue3() +
                ", fifth=" + getValue4() +
                ", sixth=" + getValue5() +
                ", seventh=" + getValue6() +
                ", eighth=" + getValue7() +
                ", ninth=" + ninth +
                '}';
    }
}

我们现在可以使用以下方法创建和访问Ennead元组的值：

Ennead<String, Integer, Double, Boolean, Long, Short, Float, Character, String> ennead = new Ennead<>("A", 1, 2.0, true, 100L, (short) 2, 2.0f, 'A', "Hello");

String a = ennead.getValue0();
Integer b = ennead.getValue1();
Double c = ennead.getValue2();
Boolean d = ennead.getValue3();
Long e = ennead.getValue4();
Short f = ennead.getValue5();
Float g = ennead.getValue6();
Character h = ennead.getValue7();
String i = ennead.getNinth();

我们还可以使用扩展的endsWith方法来检查元组是否以特定的值结束。如下所示：

boolean isEndsWithHello = ennead.endsWith("Hello");

此方法将返回true，因为ennead的第九个元素的值为“Hello”。

我们还可以使用重写的hashCode()和equals()方法来比较两个Ennead类型的元组是否相等，以及使用重写的toString()方法来获取元组的字符串表示形式。

结论

JavaTuples库提供了从单元素到十元素的不同类型的元组实现。我们可以使用这些元组来存储和访问多个数据值。我们还可以根据需要扩展JavaTuples库提供的元组类型来实现自定义元组类型。