setChar() method of java.lang.reflect.Field used to set the value of a field as a char on the specified object. When you need to set the value of a field of an object as char then you can use this method to set value over an Object. Syntax:
public void setChar(Object obj, char c)
throws IllegalArgumentException,
IllegalAccessException
Parameters: This method accepts  two parameters:
- obj: which is the object whose field should be modified and
- c: which is the new value for the field of obj being modified.
Return: This method returns nothing.Â
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 setChar() method:Â
Program 1:Â
Java
// Java program to illustrate setByte() methodÂ
// program illustrate setChar()import java.lang.reflect.Field;Â
public class GFG {Â
    public static void main(String[] args)        throws Exception    {Â
        // create user object        Employee emp = new Employee();Â
        // print value of lastNamePrefix        System.out.println(            "Value of lastNamePrefix before "            + "applying setChar is "            + emp.lastNamePrefix);Â
        // Get the marks field object        Field field = Employee.class                          .getField("lastNamePrefix");Â
        // Apply setChar Method        field.setChar(emp, 'B');Â
        // print value of lastNamePrefix        System.out.println(            "Value of lastNamePrefix after "            + "applying setChar is "            + emp.lastNamePrefix);Â
        // print value of firstNamePrefix        System.out.println(            "Value of firstNamePrefix before "            + "applying setChar is "            + emp.firstNamePrefix);Â
        // Get the marks field object        field = Employee.class                    .getField("firstNamePrefix");Â
        // Apply setChar Method        field.setChar(emp, 'Z');Â
        // print value of firstNamePrefix        System.out.println(            "Value of firstNamePrefix after "            + "applying setChar is "            + emp.firstNamePrefix);    }}Â
// sample classclass Employee {Â
    // static char values    public static char firstNamePrefix = 'A';    public static char lastNamePrefix = 'S';} |
Output:
Value of lastNamePrefix before applying setChar is S Value of lastNamePrefix after applying setChar is B Value of firstNamePrefix before applying setChar is A Value of firstNamePrefix after applying setChar is Z
Program 2:Â
Java
// Java program to illustrate setChar() methodÂ
import java.lang.reflect.Field;Â
public class GFG {Â
    public static void main(String[] args)        throws Exception    {Â
        // create user object        User user = new User();Â
        // Get the id field object        Field field = User.class                          .getField("id");Â
        // Apply setChar Method        field.setChar(user, 'A');Â
        // print value of isActive        System.out.println("Value after "                           + "applying setChar is "                           + user.id);    }}Â
// sample User classclass User {Â
    // static char values    public static char id = 'Z';} |
Output:
Value after applying setChar is A
