The toArray() method of Chars Class in the Guava library is used to convert the char values, passed as the parameter to this method, into a Char Array. These char values are passed as a Collection to this method. This method returns a Char array.
Syntax:
public static char[] toArray(Collection<Character> collection)
Parameters: This method accepts a mandatory parameter collection which is the collection of char values to be converted in to a Char array.
Return Value: This method returns a char 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 Chars.toArray() method  import com.google.common.primitives.Chars;import java.util.Arrays;import java.util.List;  class GFG {      // Driver's code    public static void main(String[] args)    {          // Creating a List of Chars        List<Character> myList            = Arrays.asList('G', 'E', 'E', 'K', 'S');          // Using Chars.toArray() method to convert        // a List or Set of Char to an array of Char        char[] arr = Chars.toArray(myList);          // Displaying an array containing each        // value of collection,        // converted to a char value        System.out.println(Arrays.toString(arr));    }} |
Output:
[G, E, E, K, S]
Example 2 :
// Java code to show implementation of// Guava's Chars.toArray() method  import com.google.common.primitives.Chars;import java.util.Arrays;import java.util.List;  class GFG {      // Driver's code    public static void main(String[] args)    {          try {            // Creating a List of Chars            List<Character> myList                = Arrays.asList('a', 'b', null);              // Using Chars.toArray() method            // to convert a List or Set of Char            // to an array of Char.            // This should raise "NullPointerException"            // as the collection contains "null"            // as an element            char[] arr = Chars.toArray(myList);              // Displaying an array containing each            // value of collection,            // converted to a char value            System.out.println(Arrays                                   .toString(arr));        }        catch (Exception e) {            System.out.println(e);        }    }} |
Output:
java.lang.NullPointerException
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