Java Guava | Bytes.toArray() method with Examples
Last Updated :
31 Jan, 2019
The toArray() method of Bytes Class in the Guava library is used to convert the byte values, passed as the parameter to this method, into a Byte Array. These byte values are passed as a Collection to this method. This method returns a Byte array.
Syntax:
public static byte[] toArray(Collection<? extends Number> collection)
Parameters: This method accepts a mandatory parameter collection which is the collection of byte values to be converted in to a Byte array.
Return Value: This method returns a byte 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.Bytes;
import java.util.Arrays;
import java.util.List;
class GFG {
public static void main(String[] args)
{
List<Byte> myList
= Arrays.asList(( byte ) 1 ,
( byte ) 2 ,
( byte ) 3 ,
( byte ) 4 ,
( byte ) 5 );
byte [] arr = Bytes.toArray(myList);
System.out.println(Arrays.toString(arr));
}
}
|
Example 2:
import com.google.common.primitives.Bytes;
import java.util.Arrays;
import java.util.List;
class GFG {
public static void main(String[] args)
{
try {
List<Byte> myList
= Arrays.asList(( byte ) 2 ,
( byte ) 4 ,
null );
byte [] arr = Bytes.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/19.0/api/docs/com/google/common/primitives/Bytes.html#toArray(java.util.Collection)
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