Programmer Think

WeChat official account: operation and development story, Lao Zheng Class loading process Class loading timing The whole life cycle of a type will go through seven stages: loading, verification, preparation, parsing, initialization, use and unloading. Where validation, preparation, and resolution are connections Seven cases in which class ...

Lists are equivalent to arrays in other languages Multiple different data types can be stored in the list How to create a list: ① Use brackets [] ② Call the built-in function list() lst = ['hello', 'world', 98] lst2 = list(['hello', 'world', 98]) print(lst) print(lst2) print(lst[1]) # world print(lst[-2]) # world Features of the list: ① Th ...

1. Heavy load The concept of overloaded methods Definition: more than one method with the same name is allowed in the same class, as long as their parameter number or parameter type are different. Summary: "two are the same and different": the same class and the same method name Different parameter lists: different parameter numb ...

1. The default six member functions of the class If there is nothing in a class, it is referred to as an empty class. Is there nothing in the empty class? No, if I don't implement any class, the following six default member functions will be generated automatically Default member functions: they are special member functions. If we don't imp ...

Author: Xiao Fu GeBlog: https://bugstack.cnPrecipitate, share and grow, so that you and others can gain something! 😄1, ForewordOne sided!On the third day of January, Tolstoy said, "what a great writer is just writing his own one-sided". Not to mention me, not to mention us!Although we don't write articles, we write requirements, code ...

Spring core DI Official website interpretation Dependency injection (DI) is a process whereby objects define their dependencies (that is, the other objects with which they work) only through constructor arguments, arguments to a factory method, or properties that are set on the object instance after it is constructed or returned from a fa ...

[ceph related] bucket dynamic slicing 1. Background description Reference notes: https://access.redhat.com/documentation/en-us/red_hat_ceph_storage/2/html/object_gateway_guide_for_ubuntu/administration_cli#configuring-bucket-index-sharding https://ceph.com/community/new-luminous-rgw-dynamic-bucket-sharding/ 1.1 problem description Duri ...

Basic concepts performance These key points should be met: (1) Easy to use, one line of code may be a problem. (2) Easy integration, Ctrl C/V two minutes to get the kind. (3) High performance can not affect the business itself, or the impact is the lowest when necessary. If a business takes 10 milliseconds and 9 milliseconds are spent on l ...

1, Relationship between tables 1.1 one to one 1.2 one to many A class can have multiple students, which is called one to many relationship 1.3 many to many A teacher can lead multiple students, and a student can be taught by multiple teachers, so the relationship between the two tables is many to many. 2, Join table query 2.1 co ...

Basics The statement ends with a semicolon compile g++ name.cpp -o new_name # gcc for c language # g for c + +++ implement ./name Standard library Core language: provides all building blocks, including variables, data types, constants, etcc + + Standard Library: provides a large number of functions for manipulating objects such as fi ...