Java Reflection - Java Field.setLong(Object obj, long l)

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Syntax

Field.setLong(Object obj, long l) has the following syntax.

public void setLong(Object obj,  long l)  throws IllegalArgumentException ,   IllegalAccessException

Example

In the following code shows how to use Field.setLong(Object obj, long l) method.

import java.lang.reflect.Field;
//from w  w  w . ja v a  2 s.  co  m
class MyClass {
  public long i = 99999999L;
}

public class Main {
  public static void main(String[] args) throws Exception {
    Class<?> clazz = Class.forName("MyClass");
    MyClass x = (MyClass) clazz.newInstance();

    Field f = clazz.getField("i");
    System.out.println(f.getLong(x));
    
    f.setLong(x, 9L);
    System.out.println(f.getLong(x)); 

  }
}

The code above generates the following result.

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