1. Encapsulation 1.1 Concept of encapsulation There are three major characteristics of object-oriented programs: encapsulation, inheritance, and polymorphism. In the class and object stage, the main research is on encapsulation characteristics. What is encapsulation? simply put It’s the shell shielding details. Encapsulation: organically combine data and methods of operating data, hide the properties and implementation […]
Tag: keyword
[JUC] 1. synchronized keyword and Lock interface
Article directory 1. JUC 2. Processes and threads 3. Concurrency and parallelism 4. User thread and daemon thread 5. Object locks and class locks 6. Synchronized keyword 7. synchronized case 8. Lock interface 1.JUC JUC, the java.util.concurrent toolkit for processing threads, started with JDK1.5, and has three packages: Basic package Atomic package Lock bag 2. […]
Nanny-level explanation of static keyword
What is the static keyword? In Java, a static keyword is defined, which is used to modify members of a class, such as member variables, member methods, and code blocks. When a member is declared static, it is called a class member (or class attribute), not an instance member. There is only one copy of […]
Build a keyword-driven automated testing framework
Preface In the last article, we have learned how the data-driven automated testing framework builds and drives tests! So in this article we will learn how keyword-driven testing drives automated testing to complete the entire testing process. Keyword-driven framework is a functional automation testing framework, which is also known as table-driven testing or action word-based […]
java synchronized keyword
Bytecode level 0x0020 [synchronized] will be added to the method flag. Specifically used are monitorenter and monitorexit 0 load_0 1 dup 2 astore_1 3 monitorenter 4 aload_1 5 monitorexit 6 goto 14 (+ 8) 9 astore_2 10 aload_1 11 monitorexit 12 aload_2 13 throw 14 return Why are there two monitorexits? In addition to normal […]
Do you know the underlying principle of the synchronized keyword?
Synchronized [Object Lock] uses a mutually exclusive method so that at most one thread can hold the [Object Lock] at the same time. Other threads will be blocked when they want to acquire this [Object Lock]. The code for grabbing tickets is as follows. If it is not locked, it will be oversold or one […]
4.2 final keyword
Mind map: 4.2.1 final keyword modified class Definition and basic concepts: In Java, the final keyword has the meaning of “final” or “immutable”. Elements (classes, methods or variables) modified with the final keyword have specific characteristics. Main applications and precautions: Modified class: Classes modified with final cannot be inherited. Modified method: Methods modified with final […]
The list type in Python is ( ). A. d = [1 2 3]B. d = [1,2,3] C. d = [] D. d = list(range(3)) The keyword to define a function in Python is (
Multiple choice questions 1.The list type in Python is ( ). A. d = [1 2 3] B. d = [1,2,3] C. d = [] D. d = list(range(3)) Answer: A Analysis: A. d = [1 2 3] is a syntax error code, the elements should be separated by commas, so it does not belong […]
Python-match continuous content based on keywords
Use PyQt5 to generate an executable small program: match the content in GGA format from the start keyword to the end keyword range, support multiple selection of files, and clear the copied files generated during the process. The GGA file is as follows: $GPZDA,063052.00,16,10,2023,,*61 $GPGGA,063052.00,4349.7377413,N,12509.8354912,E,4,40,0.6,222.928,M,0.00,M,01,2445*69 $GPZDA,063053.00,16,10,2023,,*60 $GPGGA,063053.00,4349.7377412,N,12509.8354914,E,4,40,0.6,222.926,M,0.00,M,01,2445*61 $GPZDA,063054.00,16,10,2023,,*67 Mini program interface: Run pyinstaller -F -w […]
python-matching continuous content based on keywords Ⅱ
Use PyQt5 to generate an executable small program: match the contents of the pos file between the start keyword and the end keyword, convert UTC time to GPS time, and clear the copied files generated in the process. pos file is as follows: % (x/y/z-ecef=WGS84,Q=1:fix,2:float,3:sbas,4:dgps,5:single,6:ppp,ns=# of satellites % GPST x-ecef(m) y-ecef(m) z-ecef(m) Q ns sdx(m) […]