JavaTuples - Set Values

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A tuple has setAtX() methods to set value at particular index. For example Triplet class has following methods.

  • setAt0() − set value at index 0.

  • setAt1() − set value at index 1.

  • setAt2() − set value at index 2.

Feature

  • Tuples are immutable. Each setAtX() returns a new tuple which is to be used to see the updated value.

  • Type of a position of a tuple can be changed using setAtX() method.

Example

Let's see JavaTuples in action. Here we'll see how to set values in a tuple using various ways.

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

File: TupleTester.java

package com.howcodex;
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

Compile the classes using javac compiler as follows −

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

Now run the TupleTester to see the result −

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

Output

Verify the Output

Original Pair: [Test, 5]
Updated Pair:[Updated Value, 5]
Original Pair: [Test, 5]
Changed Pair:[Test, Changed Type]
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