Java tutorial
import java.lang.reflect.Field; class MyClass { public boolean i = true; } 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.getBoolean(x)); f.setBoolean(x, false); System.out.println(f.getBoolean(x)); } }