import java.lang.annotation.*;

@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.FIELD)
@interface Kolom {
    String nama();
    boolean wajib() default false;
}

public class KolomTanpaNama {
    @Kolom(wajib = true) // elemen wajib 'nama' tidak diisi
    int id;

    public static void main(String[] args) {}
}