Ints toArray() function | Guava | Java
Guava’s Ints.toArray() returns an array containing each value of collection, converted to a int value in the manner of Number.intValue()
Syntax:
public static int[]
toArray(Collection<? extends Number> collection)
Parameters: This method takes the collection as parameter which is a collection of Number instances.
Return Value: This method returns an array containing the same values as collection, in the same order, converted to primitives.
Exceptions: This method throws NullPointerException if collection or any of its elements is null.
Below examples illustrate the Ints.toArray() method:
Example 1:
import com.google.common.primitives.Ints;
import java.util.Arrays;
import java.util.List;
class GFG {
public static void main(String[] args)
{
List<Integer>
myList = Arrays.asList( 1 , 2 , 3 , 4 , 5 );
int [] arr = Ints.toArray(myList);
System.out.println( "Array from given List: "
+ Arrays.toString(arr));
}
}
|
Output:
Array from given List: [1, 2, 3, 4, 5]
Example 2: To demonstrate NullPointerException
import com.google.common.primitives.Ints;
import java.util.Arrays;
import java.util.List;
class GFG {
public static void main(String[] args)
{
try {
List<Integer>
myList = Arrays.asList( 2 , 4 , null );
int [] arr = Ints.toArray(myList);
System.out.println(Arrays.toString(arr));
}
catch (Exception e) {
System.out.println( "Exception: " + e);
}
}
}
|
Output:
Exception: java.lang.NullPointerException
Reference: https://google.github.io/guava/releases/22.0/api/docs/com/google/common/primitives/Ints.html#toArray-java.util.Collection-
Last Updated :
15 Nov, 2018
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