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1. Circular dependency resolution in the case of prototype Bean First of all, Spring will not scan prototype beans in the scanning phase. These prototype beans will be created only when called. List several scenarios for prototype beans to briefly describe: (1) Suppose there are two objects, class A and class B, and both are defined as pro ...

I inherit The essence of inheritance is to reuse the data members and methods of the base class  The essence of encapsulation is to expose only the necessary use interfaces to the outside world. The internal specific implementation details and some core interfaces are invisible to the outside world, hide the details, and only open the nec ...

catalogue 1. Basic concept and definition of inheritance 1.1 basic concept of inheritance 1.2 definition of succession 2. Assignment conversion of base class and derived class objects 3. Scope in inheritance  4. Default member function of derived class 4.1 calling order of constructor destructor of base class derived class ...

Function basis 1. Define function 1. What is a function concept A function is the encapsulation of the code that implements a specific function - > a function corresponds to a function (the function stored in the function) Classification (by who created the function) System functions - there are functions that have been created in Py ...

When we group the elements in the list, we can then aggregate the fields of the grouped elements to perform meaningful operations to help us analyze the data. Some examples are addition, average, or maximum / minimum. Aggregation of these individual fields can be easily done using Java Streams and Collectors. This document provides simple examp ...

For the first time, the Python back-end interface was sent to the front-end after the Postman test. The front-end worked for a long time and said it was a cross domain problem. I wondered why the web page didn't work when Postman could pass. Was there a problem with the front-end code? The front-end boss explained that the Postman test could no ...

Implementation of semi-automatic scheduling system with python language 0. Why do you want to make this software? I believe that all dalaos engaged in personnel, especially store managers in store sales, should have experienced the pain of scheduling. It can be said that it is a mechanical, time-consuming and laborious work to collect the ...

1. What is a bug? The moth that was found to cause a computer error for the first time is also the first computer program error. 2. What is debugging? How important is it? Everything that happens must have traces to follow. If there is a clear conscience, there is no need to cover up and there are no signs. If there is a guilty consc ...

#Unified exception handling SpringBoot has a unified method of handling exceptions To put the exception under a specific path, you only need to put the error page under templates/error. The name of the error page should be consistent with the error type code When the corresponding type error occurs, springboot will automatically jum ...

1, Experimental purpose   1.1 understand the concepts of process control block and process queue.   1.2 master the processing logic of process priority scheduling algorithm and time slice rotation scheduling algorithm. 2, Experimental content    2.1 design the structure of process control block PCB, which is applica ...