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Each tuple provides utility methods to check their elements in similar fashion as collection.
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contains(element) − checks if element is present or not.
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containsAll(collection) − checks if elements are present or not.
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indexOf(element) − returns the index of first element if present otherwise -1.
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lastIndexOf(element) − returns the index of last element if present otherwise -1.
Pair<String, Integer> pair = Pair.with("Test", Integer.valueOf(5)); boolean isPresent = pair.contains("Test");
Example
Let”s see JavaTuples in action. Here we”ll see how to check elements in a tuple.
Create a java class file named TupleTester in C:>JavaTuples.
File: TupleTester.java
package com.tutorialspoint; import java.util.List; import org.javatuples.Quartet; public class TupleTester { public static void main(String args[]){ Quartet<String, Integer, String, String> quartet = Quartet.with( "Test1", Integer.valueOf(5), "Test3", "Test3" ); System.out.println(quartet); boolean isPresent = quartet.contains(5); System.out.println("5 is present: " + isPresent); isPresent = quartet.containsAll(List.of("Test1", "Test3")); System.out.println("Test1, Test3 are present: " + isPresent); int indexOfTest3 = quartet.indexOf("Test3"); System.out.println("First Test3 is present at: " + indexOfTest3); int lastIndexOfTest3 = quartet.lastIndexOf("Test3"); System.out.println("Last Test3 is present at: " + lastIndexOfTest3); } }
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
[Test1, 5, Test3, Test3] 5 is present: true Test1, Test3 are present: true First Test3 is present at: 2 Last Test3 is present at: 3
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