循环遍历类的属性并获取非空属性的计数

import java.lang.reflect.Field;

public class PropertyCounter {
    public static int countNonNullProperties(Object obj) {
        int count = 0;
        Class<?> clazz = obj.getClass();
        Field[] fields = clazz.getDeclaredFields();

        for (Field field : fields) {
            field.setAccessible(true);
            try {
                Object value = field.get(obj);
                if (value != null) {
                    count++;
                }
            } catch (IllegalAccessException e) {
                e.printStackTrace();
            }
        }

        return count;
    }

    public static void main(String[] args) {
        // 示例使用一个自定义的类
        class Person {
            private String name;
            private int age;
            private String address;

            public Person(String name, int age, String address) {
                this.name = name;
                this.age = age;
                this.address = address;
            }
        }

        Person person = new Person("John", 25, "123 Main St");
        int nonNullProperties = countNonNullProperties(person);
        System.out.println("非空属性的计数：" + nonNullProperties);
    }
}