The toArray() method of Floats Class in the Guava library is used to convert the float values, passed as the parameter to this method, into a Float Array. These float values are passed as a Collection to this method. This method returns a Float array.
Syntax:
public static float[] toArray(Collection<? extends Number> collection)
Parameters: This method accepts a mandatory parameter collection which is the collection of float values to be converted in to a Float array.
Return Value: This method returns a float array containing the same values as a collection, in the same order.
Exceptions: This method throws NullPointerException if the passed collection or any of its elements is null.
Below programs illustrate the use of toArray() method:
Example 1 :
// Java code to show implementation of// Guava's Floats.toArray() method  import com.google.common.primitives.Floats;import java.util.Arrays;import java.util.List;  class GFG {      // Driver's code    public static void main(String[] args)    {          // Creating a List of Floats        List<Float> myList            = Arrays.asList(1.2f, 2.3f, 3.4f, 4.5f, 5.6f);          // Using Floats.toArray() method to convert        // a List or Set of Float to an array of Float        float[] arr = Floats.toArray(myList);          // Displaying an array containing each        // value of collection,        // converted to a float value        System.out.println(Arrays.toString(arr));    }} |
[1.2, 2.3, 3.4, 4.5, 5.6]
Example 2 :
// Java code to show implementation of// Guava's Floats.toArray() method  import com.google.common.primitives.Floats;import java.util.Arrays;import java.util.List;  class GFG {      // Driver's code    public static void main(String[] args)    {          try {            // Creating a List of Floats            List<Float> myList                = Arrays.asList(1.2f, 2.3f, 3.4f, null);              // Using Floats.toArray() method            // to convert a List or Set of Float            // to an array of Float.            // This should raise "NullPointerException"            // as the collection contains "null"            // as an element            float[] arr = Floats.toArray(myList);              // Displaying an array containing each            // value of collection,            // converted to a float value            System.out.println(Arrays                                   .toString(arr));        }        catch (Exception e) {            System.out.println(e);        }    }} |
java.lang.NullPointerException
