The java.lang.reflect.Array.getLong() is an inbuilt method in Java and is used to return an element at the given index from a specified Array as a long.
Syntax:
Array.getLong(Object []array, int index)
Parameters : This method accepts two mandatory parameters:
- array: The object array whose index is to be returned.
- index: The particular index of the given array. The element at ‘index’ in the given array is returned.
Return Value: This method returns the element of the array as long.
Exceptions: This method throws following exceptions:
- NullPointerException – when the array is null.
- IllegalArgumentException – when the given object array is not an Array.
- ArrayIndexOutOfBoundsException – if the given index is not in the range of the size of the array.
Below programs illustrate the get() method of Array class:
Program 1:
import java.lang.reflect.Array; public class GfG { // main method public static void main(String[] args) { // Declaring and defining an int array int a[] = { 1, 2, 3, 4, 5 }; // Traversing the array for (int i = 0; i < 5; i++) { // Array.getLong method long x = Array.getLong(a, i); // Printing the values System.out.print(x + " "); } }} |
Output:
1 2 3 4 5
Program 2: To demonstrate ArrayIndexOutOfBoundsException.
import java.lang.reflect.Array; public class GfG { // main method public static void main(String[] args) { // Declaring and defining an int array int a[] = { 1, 2, 3, 4, 5 }; try { // invalid index // Array.getLong method long x = Array.getLong(a, 6); System.out.println(x); } catch (Exception e) { // throws Exception System.out.println("Exception : " + e); } }} |
Output:
Exception : java.lang.ArrayIndexOutOfBoundsException
Program 3: To demonstrate NullPointerException.
import java.lang.reflect.Array; public class GfG { // main method public static void main(String[] args) { // Declaring an int array int a[]; // array to null a = null; try { // null Object array // Array.getLong method long x = Array.getLong(a, 6); System.out.println(x); } catch (Exception e) { // throws Exception System.out.println("Exception : " + e); } }} |
Output:
Exception : java.lang.NullPointerException
Program 4: To demonstrate IllegalArgumentException.
import java.lang.reflect.Array; public class GfG { // main method public static void main(String[] args) { // int (Not an array) int y = 0; try { // illegalArgument // Array.getLong method long x = Array.getLong(y, 6); System.out.println(x); } catch (Exception e) { // Throws exception System.out.println("Exception : " + e); } }} |
Output:
Exception : java.lang.IllegalArgumentException: Argument is not an array
