static 加载顺序实例

背景：XXXconstant类中有个写死的static final String[]，需要动态地从schema中解析出该String Array。并且去除指定数组集合中的部分元素

// 需从schema动态加载
public static final String[] ALL_KEYS;

static {
    Map<String, Object> typesMap = null;
    try {
       allTypeMap = Util.getAllTypes();
    } catch (BadRequestException e) {
       e.printStackTrace();
    }
    Map<String, String> schemaMap = (Map<String, String>) typesMap.get(VALUE_TYPE);
    Set<String> schemaKeySet = schemaMap.keySet();
    ALL_KEYS = schemaKeySet.toArray(new String[schemaKeySet.size()]);
}

// 定死的几个特例
public static final String[] NO_NEED_KEYS = {ID, COMPANY, TYPE, CREATE_TIME, UPDATE_TIME};

// 其余

然后使数组相减（取交集的补集）

public static String[] arrayContrast(String[] longArr, String[] shortArr) {
        List<String> list = new LinkedList<>();
        for (String str : longArr) { 
            if (!list.contains(str)) {
                list.add(str);
            }
        }
        for (String str : shortArr) { 
            if (list.contains(str)) {
                list.remove(str);
            }
        }
        String[] result = {}; 
        return list.toArray(result); 
    }