JavaTuples - Get Values

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A tuple has getValueX() methods to get values and getValue() a generic method to get value by index. For example Triplet class has following methods.

  • getValue(index) − returns value at index starting from 0.

  • getValue0() − returns value at index 0.

  • getValue1() − returns value at index 1.

  • getValue2() − returns value at index 2.

Feature

  • getValueX() methods are typesafe and no cast is required, but getValue(index) is generic.

  • A tuple has getValueX() methods upto element count. For example, Triplet has no getValue3() method but Quartet has.

  • Semantic Classes KeyValue and LabelValue has getKey()/getValue() and getLabel()/getValue() instead of getValue0()/getValue1() methods.

Example

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

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

File: TupleTester.java

package com.howcodex;
import org.javatuples.KeyValue;
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));   
      Object value0Obj = pair.getValue(0);
      Object value1Obj = pair.getValue(1);
      String value0 = pair.getValue0();
      Integer value1 = pair.getValue1();
      System.out.println(value0Obj);
      System.out.println(value1Obj);
      System.out.println(value0);
      System.out.println(value1);  
	   KeyValue<String, Integer> keyValue = KeyValue.with(
         "Test", Integer.valueOf(5)
      );
      value0 = keyValue.getKey();
      value1 = keyValue.getValue();
      System.out.println(value0Obj);
      System.out.println(value1Obj);
   }
}

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

Test
5
Test
5
Test
5
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