Javatuples 简明教程

JavaTuples - Create Tuples

可以使用多个选项使用 JavaTuple 类创建元组。以下是示例：

A tuple using JavaTuple classes can be created using multiple options. Following are the examples −

Using with() Methods

每个元组类都有一个带对应参数的 with() 方法。例如：

Each tuple class has a with() method with corresponding parameters. For example −

Pair<String, Integer> pair = Pair.with("Test", Integer.valueOf(5));
Triplet<String, Integer, Double> triplet = Triplet.with("Test", Integer.valueOf(5),
   Double.valueOf(32.1));

Using Constructor

每个元组类都有一个带对应参数的构造函数。例如：

Each tuple class has a constructor with corresponding parameters. For example −

Pair<String, Integer> pair = new Pair("Test", Integer.valueOf(5));
Triplet<String, Integer, Double> triplet = new Triplet("Test", Integer.valueOf(5),
   Double.valueOf(32.1));

Using Collections

每个元组类都有一个带有相应参数的 fromCollection() 方法。例如：

Each tuple class has a fromCollection() method with corresponding parameters. For example −

Pair<String, Integer> pair = Pair.fromCollection(listOfTwoElements);

Using Iterable

每个元组类都有一个 fromIterable() 方法以通用方式获取元素。例如：

Each tuple class has a fromIterable() method to get elements in generic fashion. For example −

// Retrieve three values from an iterable starting at index 5
Triplet<Integer,Integer,Integer> triplet = Triplet.fromIterable(listOfInts, 5);

Example

让我们来看看 JavaTuples 在操作中的表现。此处我们将了解使用各种方式创建元组。

Let’s see JavaTuples in action. Here we’ll see how to create tupels using various ways.

在 C:>JavaTuples 中创建一个名为 TupleTester 的 Java 类文件。

Create a java class file named TupleTester in C:\>JavaTuples.

文件：TupleTester.java

File: TupleTester.java

package com.tutorialspoint;
import java.util.ArrayList;
import java.util.List;
import org.javatuples.Pair;

public class TupleTester {
   public static void main(String args[]){
      //Create using with() method
      Pair<String, Integer> pair = Pair.with("Test", Integer.valueOf(5));
      //Create using constructor()
      Pair<String, Integer> pair1 = new Pair("Test", Integer.valueOf(5));
      List<Integer> listOfInts = new ArrayList<Integer>();
      listOfInts.add(1);
      listOfInts.add(2);
      //Create using fromCollection() method
      Pair<Integer, Integer> pair2 = Pair.fromCollection(listOfInts);
      listOfInts.add(3);
      listOfInts.add(4);
      listOfInts.add(5);
      listOfInts.add(6);
      listOfInts.add(8);
      listOfInts.add(9);
      listOfInts.add(10);
      listOfInts.add(11);
      //Create using fromIterable() method
      // Retrieve three values from an iterable starting at index 5
      Pair<Integer,Integer> pair3 = Pair.fromIterable(listOfInts, 5);
      //print all tuples
      System.out.println(pair);
      System.out.println(pair1);
      System.out.println(pair2);
      System.out.println(pair3);
   }
}

Verify the result

使用以下 javac 编译器编译类：

Compile the classes using javac compiler as follows −

C:\JavaTuples>javac -cp javatuples-1.2.jar ./com/tutorialspoint/TupleTester.java

现在运行 TupleTester 查看结果：

Now run the TupleTester to see the result −

C:\JavaTuples>java  -cp .;javatuples-1.2.jar com.tutorialspoint.TupleTester

Output

验证输出

Verify the Output

[Test, 5]
[Test, 5]
[1, 2]
[6, 8]