Static methods belong to the class that the static method is loaded with class and loaded when loading classes, the program will allocate memory for the static methods
non-static method belongs to the object, the object is created after the class load
static method before the object exists, so if a static method call non-static methods, it may be reported to a null pointer exception.
Why static method can not directly access non-static method?
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Origin www.cnblogs.com/yuanjl/p/11041922.html
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