Array setDouble() method in Java

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

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