如何使用反射为数组字段和字典设置值？

import java.lang.reflect.Array;
import java.lang.reflect.Field;
import java.util.HashMap;
import java.util.Map;

public class ReflectionExample {
    public static void setArrayAndMapValues(Object obj) throws IllegalAccessException {
        Class<?> clazz = obj.getClass();
        Field[] fields = clazz.getDeclaredFields();

        for (Field field : fields) {
            field.setAccessible(true);

            if (field.getType().isArray()) {
                Class<?> componentType = field.getType().getComponentType();
                Object array = Array.newInstance(componentType, 3);

                for (int i = 0; i < Array.getLength(array); i++) {
                    Object value = createValueForType(componentType);
                    Array.set(array, i, value);
                }

                field.set(obj, array);
            } else if (Map.class.isAssignableFrom(field.getType())) {
                Class<?> keyType = (Class<?>) field.getGenericType();
                Class<?> valueType = (Class<?>) field.getGenericType();
                Map<Object, Object> map = new HashMap<>();

                for (int i = 0; i < 3; i++) {
                    Object key = createValueForType(keyType);
                    Object value = createValueForType(valueType);
                    map.put(key, value);
                }

                field.set(obj, map);
            }
        }
    }

    private static Object createValueForType(Class<?> type) {
        // 根据类型创建相应的值
        // 这里只是一个示例，具体根据实际需求进行处理
        if (type == int.class || type == Integer.class) {
            return 0;
        } else if (type == String.class) {
            return "default";
        } else {
            return null;
        }
    }

    public static void main(String[] args) throws IllegalAccessException {
        // 示例类
        class Example {
            private int[] intArray;
            private Map<String, Integer> map;
        }

        Example example = new Example();
        setArrayAndMapValues(example);

        System.out.println(example.intArray.length);  // 输出：3
        System.out.println(example.map.size());       // 输出：3
    }
}