Java Guava | Chars.toArray() method with Examples
Last Updated :
31 Jan, 2019
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 :
import com.google.common.primitives.Chars;
import java.util.Arrays;
import java.util.List;
class GFG {
public static void main(String[] args)
{
List<Character> myList
= Arrays.asList( 'G' , 'E' , 'E' , 'K' , 'S' );
char [] arr = Chars.toArray(myList);
System.out.println(Arrays.toString(arr));
}
}
|
Example 2 :
import com.google.common.primitives.Chars;
import java.util.Arrays;
import java.util.List;
class GFG {
public static void main(String[] args)
{
try {
List<Character> myList
= Arrays.asList( 'a' , 'b' , null );
char [] arr = Chars.toArray(myList);
System.out.println(Arrays
.toString(arr));
}
catch (Exception e) {
System.out.println(e);
}
}
}
|
Output:
java.lang.NullPointerException
Reference :
https://google.github.io/guava/releases/18.0/api/docs/com/google/common/primitives/Chars.html#toArray(java.util.Collection)
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