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
