This topic is about JavaTuples – Checking Elements.
Each tuple provides utility methods to check their elements in similar fashion as collection.
- contains(element) − checks if element is present or not.
- containsAll(collection) − checks if elements are present or not.
- indexOf(element) − returns the index of first element if present otherwise -1.
- 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.Adglob;
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/Adglob/TupleTester.java
Now run the TupleTester to see the result −
C:\JavaTuples>java -cp .;javatuples-1.2.jar com.Adglob.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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