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 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 class
class 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 program to illustrate setChar() method
import 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 class
class User {
// static char values
public static char id = 'Z';
}
Output:
Value after applying setChar is A
