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Array setDouble() method in Java

Last Updated : 30 Nov, 2018
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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 
    // 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 
    // 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 
    // 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 
    // 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

    S
    ShivamKD
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