The java.lang.reflect.Array.get() is an inbuilt method in Java and is used to return the element at a given index from the specified Array.
Syntax
Array.get(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 type of Object class.
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.get method // Note : typecasting is essential // as the return type in Object. int x = ( int )Array.get(a, i); // Printing the values System.out.print(x + " " ); } } } |
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 int x = ( int )Array.get(a, 6 ); System.out.println(x); } catch (Exception e) { // throws Exception System.out.println( "Exception : " + e); } } } |
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 int x = ( int )Array.get(a, 6 ); System.out.println(x); } catch (Exception e) { // throws Exception System.out.println( "Exception : " + e); } } } |
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 int x = ( int )Array.get(y, 6 ); System.out.println(x); } catch (Exception e) { // Throws exception System.out.println( "Exception : " + e); } } } |
Exception : java.lang.IllegalArgumentException: Argument is not an array
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