Java 定义返回一个不能被修改、删除元素的List

 

为啥突然分享下这个，也是从mybatis源码看到了，所以想分享下：

org.apache.ibatis.plugin.InterceptorChain

 
使用 Collections.unmodifiableList();

示例：

    public static void main(String[] args) {
        
        List canNotEditList = getCanNotEditList();
        canNotEditList.add("收藏");
        System.out.println(canNotEditList.toString());
    }
    
    private static List getCanNotEditList() {
        List canNotEditList = new ArrayList<>();
        canNotEditList.add("请");
        canNotEditList.add("点");
        canNotEditList.add("赞");

       return  Collections.unmodifiableList(canNotEditList);
    }

运行效果：

不给动。