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Array setFloat() method in Java

  • Last Updated : 30 Nov, 2018

The java.lang.reflect.Array.setFloat() is an inbuilt method in Java and is used to change a specified float value to a specified index of a given object array.

Syntax:

Array.setFloat(Object []array, int index, float 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 float value that is to be set at the given index of the given array.

Return Value : Since this method has a void return type, hence it doesn’t returns any value. The update reflects upon the Object array passed as the argument.



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.setFloat() method:

    Program 1:




    // Java code to demonstrate
    // setFloat() method of Array class
      
    import java.lang.reflect.Array;
    public class GfG {
      
        // main method
        public static void main(String[] args)
        {
            // Declaring and defining float array
            float f[] = { 1.0f, 2.0f, 3.0f };
      
            System.out.print("Before Set : ");
      
            // printing the array
            for (float x : f) {
                System.out.print(x + " ");
            }
      
            float value = 4.0f;
      
            // setFloat method of class Array
            Array.setFloat(f, 1, value);
      
            System.out.print("\nAfter Set : ");
      
            // printing array
            for (float x : f) {
                System.out.print(x + " ");
            }
        }
    }
    Output:
    Before Set : 1.0 2.0 3.0 
    After Set : 1.0 4.0 3.0
    

    Program 2: To demonstrate java.lang.NullPointerException




    // Java code to demonstrate
    // setFloat() method of Array class
      
    import java.lang.reflect.Array;
    public class GfG {
      
        // main method
        public static void main(String[] args)
        {
            // Declaring and defining float array to null
            float b[] = null;
      
            try {
                float c = 1.0f;
                // Passing null array as parameter
                Array.setFloat(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 setFloat()
    // method of Array class
      
    import java.lang.reflect.Array;
    public class GfG {
      
        // main method
        public static void main(String[] args)
        {
            // Declaring and defining float array
            float b[] = { 1.0f, 2.0f, 3.0f };
      
            try {
                float c = 1.0f;
      
                // Passing index as 5 in parameter
                // when the size of array is 3
                Array.setFloat(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 setFloat()
    // method of Array class
      
    import java.lang.reflect.Array;
    public class GfG {
      
        // main method
        public static void main(String[] args)
        {
            // Declaring and defining float variable
            float b = 2.0f;
      
            try {
                float c = 1.0f;
      
                // Passing variable as parameter
                // where an array is expected.
                Array.setFloat(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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