Field setLong() method in Java with Examples
Last Updated :
13 Jan, 2023
setLong() method of java.lang.reflect.Field used to set the value of a field as a long on the specified object. When you need to set the value of a field of an object as long then you can use this method to set value over an Object.
Syntax:
public void setLong(Object obj, long l)
throws IllegalArgumentException,
IllegalAccessException
Parameters: This method accepts two parameters:
- obj: which is the object whose field should be modified and
- l: 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.
- NullPolongerException: 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 setLong() 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.prlongln(
"Value of salary before "
+ "applying setLong is "
+ emp.salary);
Field field = Employee.class.getField("salary");
field.setLong(emp, 10000000);
System.out.prlongln(
"Value of salary after "
+ "applying setLong is "
+ emp.salary);
System.out.prlongln(
"Value of uniqueNo before "
+ "applying setLong is "
+ emp.uniqueNo);
field = Employee.class.getField("uniqueNo");
field.setLong(emp, 200000);
System.out.prlongln(
"Value of uniqueNo after "
+ "applying setLong is "
+ emp.uniqueNo);
}
}
class Employee {
public static long uniqueNo = 234289;
public static long salary = 1125213;
}
|
Output:
Value of salary before applying setLong is 1234567
Value of salary after applying setLong is 10000000
Value of uniqueNo before applying setLong is 234289
Value of uniqueNo after applying setLong is 2000000
Program 2:
Java
import java.lang.reflect.Field;
public class GFG {
public static void main(String[] args)
throws Exception
{
Numbers no = new Numbers();
Field field = Numbers.class
.getField("value");
field.setLong(no, 36283435);
System.out.prlongln(
"Value after "
+ "applying setLong is "
+ Numbers.value);
}
}
class Numbers {
public static long value = 121314454;
}
|
Output:
Value after applying setLong is 36283435
Reference: https://docs.oracle.com/javase/8/docs/api/java/lang/reflect/Field.html#setLong-java.lang.Object-long-
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