Field setChar() method in Java with Examples
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
import java.lang.reflect.Field;
public class GFG {
public static void main(String[] args)
throws Exception
{
Employee emp = new Employee();
System.out.println(
"Value of lastNamePrefix before "
+ "applying setChar is "
+ emp.lastNamePrefix);
Field field = Employee. class
.getField("lastNamePrefix");
field.setChar(emp, 'B' );
System.out.println(
"Value of lastNamePrefix after "
+ "applying setChar is "
+ emp.lastNamePrefix);
System.out.println(
"Value of firstNamePrefix before "
+ "applying setChar is "
+ emp.firstNamePrefix);
field = Employee. class
.getField("firstNamePrefix");
field.setChar(emp, 'Z' );
System.out.println(
"Value of firstNamePrefix after "
+ "applying setChar is "
+ emp.firstNamePrefix);
}
}
class Employee {
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
import java.lang.reflect.Field;
public class GFG {
public static void main(String[] args)
throws Exception
{
User user = new User();
Field field = User. class
.getField("id");
field.setChar(user, 'A' );
System.out.println("Value after "
+ "applying setChar is "
+ user.id);
}
}
class User {
public static char id = 'Z' ;
}
|
Output:
Value after applying setChar is A
Reference: https://docs.oracle.com/javase/8/docs/api/java/lang/reflect/Field.html#setChar-java.lang.Object-char-
Last Updated :
10 Jan, 2023
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