Javatuples 简明教程
JavaTuples - Set Values
元组具有 setAtX() 方法来设置特定索引处的值。例如，Triplet 类具有以下方法。
A tuple has setAtX() methods to set value at particular index. For example Triplet class has following methods.
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setAt0() − set value at index 0.
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setAt1() − set value at index 1.
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setAt2() − set value at index 2.
Feature
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Tuples are immutable. Each setAtX() returns a new tuple which is to be used to see the updated value.
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Type of a position of a tuple can be changed using setAtX() method.
Example
让我们实际看看 JavaTuples。我们将了解如何使用各种方法在元组中设置值。
Let’s see JavaTuples in action. Here we’ll see how to set values in a tuple 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 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));
Pair<String, Integer> pair1 = pair.setAt0("Updated Value");
System.out.println("Original Pair: " + pair);
System.out.println("Updated Pair:" + pair1);
Pair<String, String> pair2 = pair.setAt1("Changed Type");
System.out.println("Original Pair: " + pair);
System.out.println("Changed Pair:" + pair2);
}
}Verify the result
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