JavaTuples add()方法

原文:https://www.geeksforgeeks.org/java-tuples-add-method/

org.javatuples 中的 add() 方法用于向现有元组添加值。由于 JavaTuples 是不可变的，因此向现有的元组添加一个值会导致新的元组多一个值。例如，向“单位”元组添加一个值会形成“对”元组。这个方法可以用于 javatuples 库的任何元组类对象，除了 Decade 类，因为 Decade 是 JavaTuples 库中可用的最高类。它返回比被调用类高的类的元组类对象，由参数中的值的数量决定。

语法:

Triplet<String, Integer, Double> triplet = ...
    ...
Quartet<String, Integer, Double, type(s)> quartet = triplet.add(value(s));

参数:该方法可以将 n 个值作为参数，其中:

  • n –indicates the number of values based on the tuple class (unit, equivalence) to be created as the return object.
  • Type –Indicates the type of value passed as a parameter.
  • Value -Indicates the value passed as a parameter.

返回值:这个方法返回 TupleClass 的对象，被调用元组类的组合值和作为参数传递的值。传递的值被添加到被调用的元组类值之后。

下面的程序说明了使用 add()方法的各种方法:

程序 1: 当 add()方法用于从 Unit 到 Ennead 的任何类时，以单个值作为参数:

// Below is a Java program to demonstrate
// use of add() method with
// single value

import java.util.*;
import org.javatuples.Unit;
import org.javatuples.Pair;

class GfG {
    public static void main(String[] args)
    {
        // Using with() method to instantiate unit object
        Unit<String> unit = Unit.with("Geeks");

        // Using add() to create Pair
        Pair<String, String> pair = unit.add("forGeeks");

        System.out.println(pair);
    }
}

输出:

[Geeks, forGeeks]

程序 2: 当 add()方法用于从 Unit 到 Ennead 的任何类时，以多个值作为参数:

// Below is a Java program to demonstrate
// use of add() method with
// multiple value

import java.util.*;
import org.javatuples.Ennead;
import org.javatuples.Decade;

class GfG {
    public static void main(String[] args)
    {
        // Using with() method to instantiate ennead object
        Ennead<String, String, String, String, String,
               String, String, String, String>
            ennead = Ennead.with("Geeks",
                                 "for",
                                 "Geeks",
                                 "A",
                                 "Computer",
                                 "Science",
                                 "Portal",
                                 "for",
                                 "Geeks");

        // Using add() to create Decade
        Decade<String, String, String, String, String,
               String, String, String, String, String>
            decade = ennead.add("RishabhPrabhu");

        System.out.println(decade);
    }
}

输出:

[Geeks, for, Geeks, A, Computer, Science, Portal, for, Geeks, RishabhPrabhu]

程序 3: 当 add()方法用于从 Unit 到 Ennead 的任何类，且总值贡献大于 10 时，它显示运行时异常:

// Below is a Java program to demonstrate
// use of add() method

import java.util.*;
import org.javatuples.Ennead;
import org.javatuples.Decade;

class GfG {
    public static void main(String[] args)
    {
        // Using with() method to instantiate ennead object
        Ennead<String, String, String, String, String,
               String, String, String, String>
            ennead = Ennead.with("Geeks",
                                 "for",
                                 "Geeks",
                                 "A",
                                 "Computer",
                                 "Science",
                                 "Portal",
                                 "for",
                                 "Geeks");

        // Using add() to create Decade
        Decade<String, String, String, String, String,
               String, String, String, String, String>
            decade = ennead.add("Rishabh", "Prabhu");

        System.out.println(decade);
    }
}

输出:

Exception in thread "main" java.lang.RuntimeException: 
    Uncompilable source code - Erroneous sym type: org.javatuples.Ennead.add

注意:同样，它也可以用于任何其他的 JavaTuple 类。

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