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我想收集所有给定类修饰符的字段。我写了以下代码：

/**
 * Method getFields
 * @author TapasB
 * @since 03-Nov-2013 - 2:03:17 pm
 * @version DAM 1.0
 * @param instanceClass
 * @return
 */
@SuppressWarnings({ "unchecked", "rawtypes" })
public static List<Field> getFields(Class<?> instanceClass) {
    List<Field> fields = new ArrayList<Field>();        
    Class<?> searchType = instanceClass;

    while (!Object.class.equals(searchType) && searchType != null) {
        fields.addAll(Arrays.asList(searchType.getDeclaredFields()));
        searchType = searchType.getSuperclass();
    }

    return Collections.unmodifiableList(new ArrayList(selectDistinct(fields, "name")));
}

/**
 * Method getFields
 * @author TapasB
 * @since 03-Nov-2013 - 2:31:59 pm
 * @version DAM 1.0
 * @param instanceClass
 * @param includedModifiers
 * @param excludedModifiers
 * @return
 */
public static List<Field> getFields(Class<?> instanceClass, int[] includedModifiers, int[] excludedModifiers) {
    List<Field> fields = getFields(instanceClass);
    List<Field> filteredFields = new ArrayList<Field>();

    if(ArrayUtils.isEmpty(includedModifiers)) {
        filteredFields.addAll(fields);
    } else {
        for(Field field : fields) {
            boolean fieldCanBeAdded = false;

            for(int includedModifier : includedModifiers) {
                if((includedModifier & field.getModifiers()) != 0) {
                    fieldCanBeAdded = true;
                }
            }

            if(fieldCanBeAdded) {
                filteredFields.add(field);
            }
        }
    }               

    if(ArrayUtils.isNotEmpty(excludedModifiers)) {
        Iterator<Field> fieldIterator = filteredFields.iterator();

        while (fieldIterator.hasNext()) {
            Field field = fieldIterator.next();
            boolean fieldNeedsToBeRemoved = false;

            for(int excludedModifier : excludedModifiers) {
                if((excludedModifier & field.getModifiers()) != 0) {
                    fieldNeedsToBeRemoved = true;
                }
            }

            if(fieldNeedsToBeRemoved) {
                fieldIterator.remove();
            }
        }
    }   

    return Collections.unmodifiableList(filteredFields);
}

该方法getFields(Class<?> instanceClass)以迭代方式搜索给定类的所有超类的字段，并在Object.

这里的 [ selectDistinct][2] 是 [LambdaJ API][3] 的方法。它删除了在父类中也存在于子类中的具有相同名称的字段。

我想知道这是否是实现我想要的好方法。

要运行它：

public static void main(String[] args) throws IllegalArgumentException, IllegalAccessException, InvocationTargetException {
    int[] includedModifiers = new int[]{Modifier.PRIVATE};
    int[] excludedModifiers = new int[]{Modifier.FINAL};
    List<Field> fields = getFields(ArrayList.class, includedModifiers, excludedModifiers);

    for(Field field : fields) {
        System.out.println(field.getName());
    }
}

将main仅打印仅具有修饰符的字段private并排除private final.

到目前为止，我发现此代码没有问题。我只想知道是否存在更好的解决方案。

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