15.4.5 简化元组的使用

最新推荐文章于 2022-11-30 14:16:59 发布

原创最新推荐文章于 2022-11-30 14:16:59 发布 · 72 阅读

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本文深入探讨了泛型在元组类中的应用，展示了如何创建不同大小的元组，并通过具体示例说明了泛型参数在方法定义与调用中的作用。通过实例演示了如何使用泛型方法来创建包含多种类型元素的元组。

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1）方法的参数列表有泛型，故方法返回值前要加泛型参数列表；

package chapter15._4._5;

import chapter15._2._1.FiveTuple;
import chapter15._2._1.FourTuple;
import chapter15._2._1.ThreeTuple;
import chapter15._2._1.TwoTuple;

public class Tuple {

    public static <A, B> TwoTuple<A, B> tuple(A a, B b) {
        return new TwoTuple<A, B>(a, b);
    }

    public static <A, B, C> ThreeTuple<A, B, C> tuple(A a, B b, C c) {
        return new ThreeTuple<A, B, C>(a, b, c);
    }

    public static <A, B, C, D> FourTuple<A, B, C, D> tuple(A a, B b, C c, D d) {
        return new FourTuple<A, B, C, D>(a, b, c, d);
    }

    public static <A, B, C, D, E> FiveTuple<A, B, C, D, E> tuple(A a, B b, C c, D d, E e) {
        return new FiveTuple<A, B, C, D, E>(a, b, c, d, e);
    }

}

package chapter15._4._5;

import chapter15._2._1.*;

public class TupleTest2 {

    static TwoTuple<String, Integer> f() {
        return Tuple.tuple("hi", 47);
    }

    static TwoTuple f2() {
        return Tuple.tuple("hi", 47);
    }

    static ThreeTuple<Amphibian, String, Integer> g() {
        return Tuple.tuple(new Amphibian(), "hi", 47);
    }

    static FourTuple<Vehicle, Amphibian, String, Integer> h() {
        return Tuple.tuple(new Vehicle(), new Amphibian(), "hi", 47);
    }

    static FiveTuple<Vehicle, Amphibian, String, Integer, Double> k() {
        return Tuple.tuple(new Vehicle(), new Amphibian(), "hi", 47, 11.1);
    }

    public static void main(String[] args) {
        TwoTuple<String, Integer> ttsi = f();
        System.out.println(ttsi);

        System.out.println(f2());
        System.out.println(g());
        System.out.println(h());
        System.out.println(k());
    }

}

输出

TwoTuple{first=hi, second=47}
TwoTuple{first=hi, second=47}
ThreeTuple{third=47, first=chapter15._2._1.Amphibian@610455d6, second=hi}
FourTuple{fourth=47, third=hi, first=chapter15._2._1.Vehicle@511d50c0, second=chapter15._2._1.Amphibian@60e53b93}
FiveTuple{fifth=11.1, fourth=47, third=hi, first=chapter15._2._1.Vehicle@5e2de80c, second=chapter15._2._1.Amphibian@1d44bcfa}