iOS面试题

1. Difference between shallow copy and deep copy? 1> 浅拷贝:指针(地址)拷贝,不会产生新对象(即分配新的内存)java 2> 深拷贝:内容拷贝,会产生新对象(即分配新的内存)数据库 2. What is advantage of categories? What is difference between implementing a cate
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