java通过反射统计实体类和父类中为空的字段数量

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import java.lang.reflect.Field;    public class FieldCounter {        public static int countNullFields(Object obj) throws IllegalAccessException {         int nullFieldCount = 0;         Class<?> clazz = obj.getClass();            while (clazz != null) {             Field[] fields = clazz.getDeclaredFields();             for (Field field : fields) {                 field.setAccessible(true);                 if (field.get(obj) == null) {                     nullFieldCount++;                 }             }             clazz = clazz.getSuperclass();         }            return nullFieldCount;     }        public static void main(String[] args) throws IllegalAccessException {         // 示例类         class Example {             String notNull = "value";             String nullField = null;         }            // 子类示例         class SubExample extends Example {             String anotherNullField = null;         }            // 统计字段数量         SubExample subExample = new SubExample();         int nullFieldCount = countNullFields(subExample);         System.out.println("空字段数量: " + nullFieldCount);     } }