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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.
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getValue(index) − returns value at index starting from 0.
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getValue0() − returns value at index 0.
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getValue1() − returns value at index 1.
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getValue2() − returns value at index 2.
Feature
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getValueX() methods are typesafe and no cast is required, but getValue(index) is generic.
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A tuple has getValueX() methods upto element count. For example, Triplet has no getValue3() method but Quartet has.
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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.tutorialspoint; 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/tutorialspoint/TupleTester.java
Now run the TupleTester to see the result −
C:JavaTuples>java -cp .;javatuples-1.2.jar com.tutorialspoint.TupleTester
Output
Verify the Output
Test 5 Test 5 Test 5
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