The java.lang.reflect.Array.getDouble() is an inbuilt method of Array class in Java and is used to return the element present at the given index from the specified Array as Double.
Syntax:
Array.getDouble(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 byte.
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.
Note: Typecast isn’t necessary as the return type is double.
Below programs illustrate the getDouble() method of Array class.
Program 1:
// Java code to demonstrate getDouble() method of Array classimport java.lang.reflect.Array;public class GfG {    // main method    public static void main(String[] args)    {          // Declaring and defining a double array        double a[] = { 1.0, 2.0, 3.0 };          // Traversing the array        for (int i = 0; i < 3; i++) {              // Array.getDouble() method              double x = Array.getDouble(a, i);            // Printing the values            System.out.print(x + " ");        }    }} |
Output:
1.0 2.0 3.0
Program 2:
// Java code to demonstrate getDouble() method of Array classimport java.lang.reflect.Array;public class GfG {    // main method    public static void main(String[] args)    {          // Declaring and defining a double array        double a[] = { 1.0, 2.0, 3.0 };          try {            double x = Array.getDouble(a, 4);        }        catch (Exception e) {            System.out.println("Exception : " + e);        }    }} |
Output:
Exception : java.lang.ArrayIndexOutOfBoundsException
Program 3:
// Java code to demonstrate getDouble() method of Array classimport java.lang.reflect.Array;public class GfG {    // main method    public static void main(String[] args)    {          // Declaring and defining a double array as null        double a[] = null;          try {            double x = Array.getDouble(a, 4);        }        catch (Exception e) {            System.out.println("Exception : " + e);        }    }} |
Output:
Exception : java.lang.NullPointerException
Program 4:
// Java code to demonstrate getDouble() method of Array classimport java.lang.reflect.Array;public class GfG {    // main method    public static void main(String[] args)    {          // Declaring and defining a double variable        double a = 1.0f;          try {            double x = Array.getDouble(a, 4);        }        catch (Exception e) {            System.out.println("Exception : " + e);        }    }} |
Output:
Exception : java.lang.IllegalArgumentException: Argument is not an array
Program 5:
// Java code to demonstrate getDouble() method of Array classimport java.lang.reflect.Array;public class GfG {    // main method    public static void main(String[] args)    {          // Declaring and defining a String array        String s[] = { "Geeks", "for", "Geeks" };          try {            double x = Array.getDouble(s, 4);        }        catch (Exception e) {            System.out.println("Exception : " + e);        }    }} |
Output:
Exception : java.lang.IllegalArgumentException: Argument is not an array
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