java如何创建一个只读集合呢?

实现思路:
    借助Collections.unmodifiableCollection(Collection c)
	即可将一个集合设置为不可修改集合

 
list<String> list = new ArrayList<>();
    list.add("java265.com-1");

Collection<String> clist = Collections. unmodifiableCollection(list);
   clist.add("java265.com-2"); // 运行时此行报错
System. out. println(list. size());