请问此处是否可以 lazy 初始化?

    static class ExecutorCatContext implements Cat.Context {

        private Map<String, String> properties;

        @Override
        public void addProperty(String key, String value) {
            if (properties == null) properties = new HashMap<>();
            properties.put(key, value);
        }

        @Override
        public String getProperty(String key) {
            if (properties == null) return null;
            return properties.get(key);
        }
    }