JavaTuples(元组)中的Quintet类

作者: Arvin Chen 分类: Java 来源: Break易站(www.breakyizhan.com)

Quintet类是从元组JavaTuples。由于此Quintet是一个泛型类,因此它可以包含任何类型的值。由于Quintet是一个元组,因此它也具有JavaTuples的所有特征:

  • Typesafe
  • 永恒的
  • 可迭代
  • Serializable
  • Comparable(实现Comparable <Tuple>)
  • 实现equals()hashCode()
  • 实现toString()

Quintet类类声明

public final class Quintet<A, B, C, D, E> extends Tuple
implements IValue0<A>, IValue1<B>, IValue2<C>, IValue3<D>, IValue4<E>

Quintet类类层次结构

Object
  ↳ org.javatuples.Tuple
      ↳ org.javatuples.Quintet<A, B, C, D, E>

创建Quintet类元组

  • 来自构造函数语法
    Quintet<A, B, C, D, E> quintet = 
        new Quintet<A, B, C, D, E>
            (value1, value2, value3, value4, value5);

    示例

    // Below is a Java program to create
    // a Quintet tuple from Constructor
    
    import java.util.*;
    import org.javatuples.Quintet;
    
    class GfG {
        public static void main(String[] args)
        {
            Quintet<Integer, String, String, Double, Boolean> quintet
                = Quintet.with(Integer.valueOf(1),
                               "breakyizhan",
                               "A computer portal",
                               Double.valueOf(20.18),
                               true);
    
            System.out.println(quintet);
        }
    }
    

    输出:

    [1, breakyizhan, A computer portal, 20.18, true]
  • 使用with()方法:with()方法是JavaTuples库提供的函数,用于使用这些值实例化对象。语法
    Quintet<type1, type2, type3, type4, type5> quintet = 
        Quintet.with(value1, value2, value3, value4, value5);

    示例

    // Below is a Java program to create
    // a Quintet tuple from with() method
    
    import java.util.*;
    import org.javatuples.Quintet;
    
    class GfG {
        public static void main(String[] args)
        {
            Quintet<Integer, String, String, Double, Boolean> quintet
                = Quintet.with(Integer.valueOf(1),
                               "breakyizhan",
                               "A computer portal",
                               Double.valueOf(20.18),
                               true);
    
            System.out.println(quintet);
        }
    }
    

    输出:

    [1, breakyizhan, A computer portal, 20.18, true]
  • 来自其他集合:fromCollection()方法用于从集合创建元组,而fromArray()方法用于从数组创建。集合/数组必须与Tuple具有相同的类型,并且集合/数组中的值的数量必须与Tuple类匹配。语法
    Quintet<type1, type2, type3, type4, type5> quintet = 
        Quintet.fromCollection(collectionWith_5_value);
    
    Quintet<type1, type2, type3, type4, type5> quintet = 
        Quintet.fromArray(arrayWith_5_value);

    示例

    // Below is a Java program to create
    // a Quintet tuple from Collection
    
    import java.util.*;
    import org.javatuples.Quintet;
    
    class GfG {
        public static void main(String[] args)
        {
            // Creating Quintet from List
            List<Integer> list = new ArrayList<Integer>();
            list.add(1);
            list.add(2);
            list.add(3);
            list.add(4);
            list.add(5);
    
            Quintet<Integer, Integer, Integer, Integer, Integer> quintet
                = Quintet.fromCollection(list);
    
            // Creating Quintet from Array
            Integer[] arr = { 1, 2, 3, 4, 5 };
    
            Quintet<Integer, Integer, Integer, Integer, Integer> otherQuintet
                = Quintet.fromArray(arr);
    
            System.out.println(quintet);
            System.out.println(otherQuintet);
        }
    }
    

    输出:

    [1,2,3,4,5]
    [1,2,3,4,5]
    

获得Quintet类的值

getValueX()方法可用于获取索引X处的元组中的值。元组中的索引从0开始。因此索引X处的值表示位置X + 1处的值。

语法

Quintet<type1, type2, type3, type4, type5> quintet = 
    new Quintet<type1, type2, type3, type4, type5>
                   (value1, value2, value3, value4, value5);

type1 val1 = quintet.getValue0();

示例

// Below is a Java program to get
// a Quintet value

import java.util.*;
import org.javatuples.Quintet;

class GfG {
    public static void main(String[] args)
    {
        Quintet<Integer, String, String, Double, Boolean> quintet
            = Quintet.with(Integer.valueOf(1),
                           "breakyizhan",
                           "A computer portal",
                           Double.valueOf(20.18),
                           true);

        System.out.println(quintet.getValue0());
        System.out.println(quintet.getValue2());
    }
}

输出:

1
A computer portal

设置Quintet类的值

由于元组是不可变的,这意味着无法修改索引处的值。因此,JavaTuples提供setAtX(value),它在索引X处创建一个带有新值的元组副本,并返回该元组。

语法

Quintet<type1, type2, type3, type4, type5> quintet = 
    new Quintet<type1, type2, type3, type4, type5>
                  (value1, value2, value3, value4, value5);

Quintet<type1, type2, type3, type4, type5> 
    otherQuintet = quintet.setAtX(value);

示例

// Below is a Java program to set
// a Quintet value

import java.util.*;
import org.javatuples.Quintet;

class GfG {
    public static void main(String[] args)
    {
        Quintet<Integer, String, String, Double, Boolean> quintet
            = Quintet.with(Integer.valueOf(1),
                           "breakyizhan",
                           "A computer portal",
                           Double.valueOf(20.18),
                           true);

        Quintet<Integer, String, String, Double> otherQuintet
            = quintet.setAt3(2.018);

        System.out.println(otherQuintet);
    }
}

输出:

[1, breakyizhan, A computer portal, 2.018, true]

添加Quintet类的值

可以在addAtX()方法的帮助下添加值,其中X表示要添加值的索引。此方法返回元素的元组,比被调用的元组多一个。

语法

Quintet<type1, type2, type3, type4, type5> quintet = 
    new Quintet<type1, type2, type3, type4, type5>
                   (value1, value2, value3, value4, value5);

Quintet<type 1, type 2, type 3, type 4, type 5> quintet = 
    quintet.addAtx(value);

示例

// Below is a Java program to add
// a value

import java.util.*;
import org.javatuples.Quintet;
import org.javatuples.Sextet;

class GfG {
    public static void main(String[] args)
    {
        Quintet<Integer, String, String, Double, Boolean> quintet
            = Quintet.with(Integer.valueOf(1),
                           "breakyizhan",
                           "A computer portal",
                           Double.valueOf(20.18),
                           true);

        Quintet<Integer, String, String, Double, Boolean, Boolean> sextet
            = quintet.addAt5(false);

        System.out.println(sextet);
    }
}

输出:

[1, breakyizhan, A computer portal, for geeks, 20.18, true, false]

在Quintet类中搜索

可以使用预定义的方法contains()在元组中搜索元素。无论值是否存在,它都返回一个布尔值。

语法

Quintet<type1, type2, type3, type4, type5> quintet = 
    new Quintet<type1, type2, type3, type4, type5>
                   (value1, value2, value3, value4, value5);

boolean res = quintet.contains(value2);

示例

// Below is a Java program to search
// a value in a Quintet

import java.util.*;
import org.javatuples.Quintet;

class GfG {
    public static void main(String[] args)
    {
        Quintet<Integer, String, String, Double, Boolean> quintet
            = Quintet.with(Integer.valueOf(1),
                           "breakyizhan",
                           "A computer portal",
                           Double.valueOf(20.18),
                           true);

        boolean exist = quintet.contains(20.18);
        boolean exist1 = quintet.contains(false);

        System.out.println(exist);
        System.out.println(exist1);
    }
}

输出:

true
false

Quintet类的迭代

由于Quintet实现了Iterable <Object>接口。这意味着它们可以以与集合或数组相同的方式进行迭代。

语法

Quintet<type1, type2, type3, type4, type5> quintet = 
    new Quintet<type1, type2, type3, type4, type5>
                   (value1, value2, value3, value4, value5);

for (Object item : quintet) {
        ...
}

示例

// Below is a Java program to iterate
// a Quintet

import java.util.*;
import org.javatuples.Quintet;

class GfG {
    public static void main(String[] args)
    {
        Quintet<Integer, String, String, Double, Boolean> quintet
            = Quintet.with(Integer.valueOf(1),
                           "breakyizhan",
                           "A computer portal",
                           Double.valueOf(20.18),
                           true);

        for (Object item : quintet)
            System.out.println(item);
    }
}

输出:

1
breakyizhan
A computer portal
20.18
true
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