import java.lang.reflect.Field;
 
class X {
    public static boolean fieldName = false;
}
 
class Allocator {
    public static void allocate(Class c) throws Exception {
        Field field = c.getDeclaredField("fieldName");
        field.set(null, true /* новое значение */);
    }
}
 
public class Main {
    public static void main(String[] args) throws Exception {
        System.out.println(X.fieldName);
        Allocator.allocate(X.class);
        System.out.println(X.fieldName);
    }
}

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