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Array setFloat() method in Java

Last Updated : 30 Nov, 2018
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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 
    // 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 
    // 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 
    // 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 
    // 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

    S

    ShivamKD
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