Array setFloat() method in Java

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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