Field setFloat() method in Java with Examples

setFloat() method of java.lang.reflect.Field used to set the value of a field as a float on the specified object. When you need to set the value of a field of an object as a float then you can use this method to set value over an Object. Syntax:

public void setFloat(Object obj, float f)
 throws IllegalArgumentException,
 IllegalAccessException

Parameters: This method accepts  two parameters:

• obj: which is the object whose field should be modified and
• f: which is the new value for the field of obj being modified.

Return: This method returns nothing. Exception: This method throws the following Exception:

• IllegalAccessException: if this Field object is enforcing Java language access control and the underlying field is either inaccessible or final.
• IllegalArgumentException: if the specified object is not an instance of the class or interface declaring the underlying field (or a subclass or implementer thereof), or if an unwrapping conversion fails.
• NullPointerException: if the specified object is null and the field is an instance field.
• ExceptionInInitializerError: if the initialization provoked by this method fails.

Below programs illustrate setFloat() method: Program 1: 

Value of salary before applying setFloat is 143125.0
Value of salary after applying setFloat is 259939.98
Value of pf before applying setFloat is 122342.89
Value of pf after applying setFloat is 234234.34

Program 2: 

Value after applying setFloat is 3244.466

Reference: https://docs.oracle.com/javase/8/docs/api/java/lang/reflect/Field.html#setFloat-java.lang.Object-float-