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.
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:
Program 1:
Java
// Java program to illustrate setByte() method// program illustrate setChar()import java.lang.reflect.Field;public class GFG { public static void main(String[] args) throws Exception { // create user object Employee emp = new Employee(); // print value of lastNamePrefix System.out.println( "Value of lastNamePrefix before " + "applying setChar is " + emp.lastNamePrefix); // Get the marks field object Field field = Employee.class .getField("lastNamePrefix"); // Apply setChar Method field.setChar(emp, 'B'); // print value of lastNamePrefix System.out.println( "Value of lastNamePrefix after " + "applying setChar is " + emp.lastNamePrefix); // print value of firstNamePrefix System.out.println( "Value of firstNamePrefix before " + "applying setChar is " + emp.firstNamePrefix); // Get the marks field object field = Employee.class .getField("firstNamePrefix"); // Apply setChar Method field.setChar(emp, 'Z'); // print value of firstNamePrefix System.out.println( "Value of firstNamePrefix after " + "applying setChar is " + emp.firstNamePrefix); }}// sample classclass Employee { // 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:
Java
// Java program to illustrate setChar() methodimport java.lang.reflect.Field;public class GFG { public static void main(String[] args) throws Exception { // create user object User user = new User(); // Get the id field object Field field = User.class .getField("id"); // Apply setChar Method field.setChar(user, 'A'); // print value of isActive System.out.println("Value after " + "applying setChar is " + user.id); }}// sample User classclass User { // static char values public static char id = 'Z';} |
Output:
Value after applying setChar is A
