Allocate objects. The objects allocated by work are

Allocate objects. The objects allocated by work are

 

Allocation is the process of creating a new object. The best time is to get a piece of memory from the operating system and specify it as the location of the instance variable that stores the object. The result of sending an alloc message to a class is to allocate enough memory for the class to store all instance variables of the class. At the same time, the alloc method also initializes all the memory areas to 0. various random bugs caused by uninitialized memory have plagued many languages, and the alloc method initializes the allocated memory to 0, so you don't have to worry about such issues. All BOOL type variables are initialized to NO, all int type variables are initialized to 0, all float type variables are initialized to 0.0, and all pointers are initialized to nil, all the bases belong to us.