Array getDouble() Method in Java - GeeksforGeeks

30 Nov, 2018
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 + " ");        }    }}
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);        }    }}
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);        }    }}
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);        }    }}
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);        }    }}
Exception : java.lang.IllegalArgumentException: Argument is not an array

Java - util package
Java-Arrays
Java-Collections
Java-Functions
java-lang-reflect-package
java-reflection-array
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