The fromCollection() method in org.javatuples is used to instantiate a tuple in a semantically elegant way, with the values of the collection, given as parameters. This method can be used to any tuple class object of javatuples library. It is a static function in each javatuple class and it returns the tuple class object of the called class, with the values initialized by the corresponding values of the collection.
Method Declaration:
public static <X> TupleClass<X> fromCollection(Collection<X> collection)
Syntax:
TupleClass<X> obj = TupleClass.fromCollection(Collection<X> collection)
Parameters: This method takes collection as parameter where:
- X– represents the datatype of values in the collection.
- collection– represents the collection of values to be inserted into TupleClass.
- TupleClass– represents the JavaTuple Class used like Unit, Quintet, Decade, etc.
Return Value: This method returns the object of TupleClass, which calls the method, with the values of the collection, passed as the parameters.
Below programs illustrate the various ways to use fromCollection() method:
Program 1: Using fromCollection() with Unit class:
// Below is a Java program to create// a Unit tuple from fromCollection() method  import java.util.*;import org.javatuples.Unit;  class GfG {    public static void main(String[] args)    {        // Creating an collection with one value        List<String> list = new ArrayList<String>();        list.add("Lazyroar");          // Using fromCollection() method        Unit<String> unit = Unit.fromCollection(list);          System.out.println(unit);    }} |
Output:
[Lazyroar]
Program 2: Using fromCollection() with Decade class:
// Below is a Java program to create// a Unit tuple from fromCollection() method  import java.util.*;import org.javatuples.Decade;  class GfG {    public static void main(String[] args)    {        // Creating an collection with 10 value        List<String> list = new ArrayList<String>();        list.add("Geeks");        list.add("for");        list.add("Geeks");        list.add("A");        list.add("Computer");        list.add("Science");        list.add("Portal");        list.add("for");        list.add("Geeks");        list.add("RishabhPrabhu");          // Using fromCollection() method        Decade<String, String, String, String, String,               String, String, String, String, String>            decade = Decade.fromCollection(list);          System.out.println(decade);    }} |
Output:
[Geeks, for, Geeks, A, Computer, Science, Portal, for, Geeks, RishabhPrabhu]
Note: Similarly, it can be used with any other JavaTuple Class.
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