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:

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    // 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 + " ");
            }
        }
    }

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    Output:

    Before Set : 1.0 2.0 3.0 
    After Set : 1.0 400.0 3.0
    

    Program 2: To demonstrate java.lang.NullPointerException

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    // 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);
            }
        }
    }

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    Output:

    Exception : java.lang.NullPointerException
    

    Program 3: To demonstrate java.lang.ArrayIndexOutOfBoundsException

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    // 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);
            }
        }
    }

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    Output:

    Exception : java.lang.ArrayIndexOutOfBoundsException
    

    Program 4: To demonstrate java.lang.IllegalArgumentException

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    // 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);
            }
        }
    }

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    Output:

    Exception : java.lang.IllegalArgumentException: Argument is not an array
    


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