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
// Java program to illustrate setLong() methodimport 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 salary System.out.prlongln( "Value of salary before " + "applying setLong is " + emp.salary); // Get the field object Field field = Employee.class.getField("salary"); // Apply setLong Method field.setLong(emp, 10000000); // print value of salary System.out.prlongln( "Value of salary after " + "applying setLong is " + emp.salary); // prlong value of uniqueNo System.out.prlongln( "Value of uniqueNo before " + "applying setLong is " + emp.uniqueNo); // Get the field object field = Employee.class.getField("uniqueNo"); // Apply setLong Method field.setLong(emp, 200000); // prlong value of uniqueNo System.out.prlongln( "Value of uniqueNo after " + "applying setLong is " + emp.uniqueNo); }}// sample classclass Employee { // static long values 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
// Java program to illustrate setLong() methodimport java.lang.reflect.Field;public class GFG { public static void main(String[] args) throws Exception { // create Numbers object Numbers no = new Numbers(); // Get the value field object Field field = Numbers.class .getField("value"); // Apply setLong Method field.setLong(no, 36283435); // prlong value of isActive System.out.prlongln( "Value after " + "applying setLong is " + Numbers.value); }}// sample Numbers classclass Numbers { // static long value public static long value = 121314454;} |
Output:
Value after applying setLong is 36283435
