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
