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Purpose: In order to solve the problem of code intrusion, annotation + Spring Aop is used to realize the pluggability of caching the project Implementation steps: 1. Import jar package Add under pom file of parent module <dependencyManagement> <dependencies> <dependency> ...

1, format Opening format: ×! / bin/bash Ending format: × $? 2, parameters $ා is the number of parameters passed to the script $0 is the name of the script itself $1 is the first parameter passed to the shell script $2 is the second parameter passed to the shell script $@ is a list of all parameters passe ...

First of all, I'd like to thank myy of Delphi's learning and communication group for debugging for 6 hours yesterday, which was finally completed. Let's record it so as not to let some fans detour. I can't understand the information of a certain degree. I think it's better to dig a hole and fill it up by myself.Two problems should be paid atten ...

Posting on blog for the first time. In the online course of reading, you need to edit a calculator to be able to calculate negative numbers and parentheses. Think about it, regular module just learned. Think about editing it. The first idea is to do a function and realize four operations. Matching symbols and numbers with regularity 1 def ...

Title Description Implement a basic calculator to evaluate the value of a simple string expression. The string expression contains only four operators and spaces: nonnegative integer, +, -, *, / and. Integer division keeps only the integer part. Example 1: Input: "3 + 2 * 2" Output: 7 Example 2: Input: &q ...

1: stack A practical requirement of 1.1 stack Please enter an expression Calculation formula: [7 * 2 * 2-5 + 1-5 + 3-3] Click to calculate [as shown below]   Excuse me: how does the bottom layer of the computer calculate the result? Note that it's not a simple operation to list the formula, beca ...

Directory Guidance: 　　I. Original Code, Counter Code and Complement Code 　　Bit operation I. Original Code, Counter Code and Complement Code There is only an adder in the computer. The data stored and calculated in the calculator are all complements. The positive number is the same as the zero's original code, inverse code and compleme ...

Command mode Definition: Encapsulate different requests into abstract commands and call real class implementations through command internals Advantage: (1) Decoupling the requester and the recipient. The requester only needs to issue relevant commands to call the recipient method internally. ( ...

Dynamic Proxy Implementation 1.JDK Dynamic Proxy jdk dynamic proxy implementation steps: Premise: jdk dynamic proxy has restrictions, the target object of proxy must implement interface Implementation: Using reflection API implementation, the specific implementation principle is not explained in detail here, only the implementation of dynam ...

Kettle implements cross-database index calculation Background note Target table structure Create test tables and test data Query statement Delete data Kettle transformation Delete data Daily value Yesterday value Last month's value sort Relation ...