import java.lang.reflect.Field;
import java.util.Arrays;
import java.util.stream.Collectors;
 
class Ideone {
  public static void main(String[] args) {
    System.out.println(Arrays.stream(Field.class.getDeclaredFields())
        .map(Field::getName)
        .collect(Collectors.toList()));
    System.out.println(Arrays.stream(Field.class.getFields())
        .map(Field::getName)
        .collect(Collectors.toList()));
    System.out.println(Field.class.getFields()[0].getDeclaringClass());
  }
}

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