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Array getDouble() Method in Java

Last Updated : 30 Nov, 2018
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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 
// Java code to demonstrate getDouble() method of Array class
import 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 
// Java code to demonstrate getDouble() method of Array class
import 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 
// Java code to demonstrate getDouble() method of Array class
import 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 
// Java code to demonstrate getDouble() method of Array class
import 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 
// Java code to demonstrate getDouble() method of Array class
import 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

S
ShivamKD
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