The java.lang.reflect.Array.setDouble() is an inbuilt method in Java and is used to set a specified double value to a specified index of a given object array.
Syntax:
Array.setDouble(Object []array, int index, double value)
Parameter: This method takes three parameters:
- array: This is an array of type Object which is to be updated.
- index: This is the index of the array which is to be updated.
- value: This is the double value that is to be set at the given index of the given array.
Exception: 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 is the implementation of Array.setDouble() method:
Program 1:
// Java code to demonstrate setDouble()// method of Array class import java.lang.reflect.Array; public class GfG { // main method public static void main(String[] args) { // Declaring and defining double array double f[] = { 1.0, 2.0, 3.0 }; // printing the array System.out.print("Before Set : "); for (double x : f) { System.out.print(x + " "); } double value = 400.0; // setDouble method of class Array Array.setDouble(f, 1, value); // printing array System.out.print("\nAfter Set : "); for (double x : f) { System.out.print(x + " "); } }} |
Output:
Before Set : 1.0 2.0 3.0 After Set : 1.0 400.0 3.0
Program 2: To demonstrate java.lang.NullPointerException
// Java code to demonstrate setDouble()// method of Array class import java.lang.reflect.Array; public class GfG { // main method public static void main(String[] args) { // Declaring and defining double array to null double b[] = null; try { double c = 1.0; // setDouble method of class Array // passing null array in parameters Array.setDouble(b, 5, c); } catch (Exception e) { System.out.println("Exception : " + e); } }} |
Output:
Exception : java.lang.NullPointerException
Program 3: To demonstrate java.lang.ArrayIndexOutOfBoundsException
// Java code to demonstrate setDouble()// method of Array class import java.lang.reflect.Array; public class GfG { // main method public static void main(String[] args) { // Declaring and defining double array double b[] = { 1.0, 2.0, 3.0 }; try { double c = 1.0; // setDouble method of class Array // passing index 5 when size is 3 Array.setDouble(b, 5, c); } catch (Exception e) { System.out.println("Exception : " + e); } }} |
Output:
Exception : java.lang.ArrayIndexOutOfBoundsException
Program 4: To demonstrate java.lang.IllegalArgumentException
// Java code to demonstrate setDouble()// method of Array class import java.lang.reflect.Array; public class GfG { // main method public static void main(String[] args) { // Declaring and defining double variable double b = 2.0; try { double c = 1.0; // setDouble method of class Array // passing a variable as parameter // when an array is required instead Array.setDouble(b, 5, c); } catch (Exception e) { System.out.println("Exception : " + e); } }} |
Output:
Exception : java.lang.IllegalArgumentException: Argument is not an array
