java中的tuple实现

java中没有类似c#、scala中的tuple元组类，只能自己动手，丰衣足食了，见下面的代码：

Tuple 抽象类

 1 import java.util.Optional;
 2 
 3 /**
 4  * Tuple元组类
 5  *
 6  * @since: 12/4/15.
 7  * @author: http://yjmyzz.cnblogs.com/
 8  */
 9 public abstract class Tuple {
10 
11     public abstract <A> Optional<A> _1();
12 
13     public abstract <B> Optional<B> _2();
14 
15     public abstract <C> Optional<C> _3();
16 
17     public abstract <D> Optional<D> _4();
18 
19     public abstract <E> Optional<E> _5();
20 
21     public static <A, B> Tuple of(A a, B b) {
22         return new Tuple2(a, b);
23     }
24 
25     public static <A, B, C> Tuple of(A a, B b, C c) {
26         return new Tuple3(a, b, c);
27     }
28 
29     public static <A, B, C, D> Tuple of(A a, B b, C c, D d) {
30         return new Tuple4(a, b, c, d);
31     }
32 
33     public static <A, B, C, D, E> Tuple of(A a, B b, C c, D d, E e) {
34         return new Tuple5(a, b, c, d, e);
35     }
36 
37 
38     public static void main(String[] args) {
39         Tuple t2 = Tuple.of(1, "one");
40         System.out.println(t2);
41         System.out.println(t2._1().get() + "," + t2._2().get());
42 
43 
44         Tuple t3 = Tuple.of(1, "one", "一");
45         System.out.println(t3);
46         System.out.println(t3._1().get() + "," + t3._2().get() + "," + t3._3().get());
47 
48 
49         Tuple t4 = Tuple.of(1, "one", "一", "壹");
50         System.out.println(t4);
51         System.out.println(t4._1().get() + "," + t4._2().get() + "," + t4._3().get() + "," + t4._4().get());
52 
53         Tuple t5 = Tuple.of(1, "one", "一", "壹", "yi");
54         System.out.println(t5);
55         System.out.println(t5._1().get() + "," + t5._2().get() + "," + t5._3().get() + "," + t5._4().get() + "," + t5._5().get());
56     }
57 
58 }

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