Java Guava | Floats.toArray() method with Examples

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 :

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// 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));
    }
}

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Output:

[1.2, 2.3, 3.4, 4.5, 5.6]

Example 2 :

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// 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);
        }
    }
}

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Output:

java.lang.NullPointerException

Reference : https://google.github.io/guava/releases/19.0/api/docs/com/google/common/primitives/Floats.html#toArray(java.util.Collection)



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