Programmer Group

1, javap command Brief javap is the jdk's own anti parsing tool. Its function is to inverse parse the code area (assembly instruction), local variable table, exception table, code line offset mapping table, constant pool and other information corresponding to the current class according to the class bytecode file. Of course, some of these info ...

The relationship between abstract factory patterns can be explained by the following figure. A super factory has multiple sub factories. Each sub factory can produce different products, but the products belong to different product families As an example, we use code to implement a factory pattern There are two product levels of mobile p ...

What is Matlab? It is the classic VB in the field of computing. They are at the bottom of the contempt chain in their respective fields. Of course, this disdain chain is the disdain chain of programmers. For those who do not want to have an in-depth understanding of programming, they can ignore it, and there is no need to continue reading ...

lsof is system management/ security Uber tools. Call this tool lsof a real name, because it means "lists open files". One thing to remember is that in Unix, everything (including network sockets) is a file. Interestingly, lsof is also one of the Linux/Unix commands with the most switches. It has so many switches, and it has many opti ...

Abstract: This paper first briefly introduces the Fault exception type, vector table and its code, exception handling C language program, and then analyzes the implementation code of exception handling assembly function in detail. This article is shared from Huawei cloud community< Hongmeng light kernel M kernel source code analysis serie ...

1, Basic introduction 1. Basic introduction Hash table (also known as hash table) is a data structure that is accessed directly according to the Key value. In other words, it accesses records by mapping key values to a position in the table to speed up the search. This mapping function is called hash function, and the array storing records is ...

If an array has more than one dimension, it can be called a multidimensional array. Let's take a specific look at the relevant knowledge of multidimensional arrays. 1. How to initialize multidimensional arrays int days[4][3]; As above, a two-dimensional array is defined. It can be regarded as an array of one-dimensional arrays. We can initi ...

I found this gearman by chance and thought it was very useful and very suitable for PHP to run some businesses. Don't say much. Install it. Find using apt sudo apt search gearman Found this gearman/bionic,bionic 1.1.18+ds-1 all Distributed job queue OK, start the installation sudo apt-get install gearman OK, the installation is complete ...

Traditional Kubernetes application building Create Namespace In a Kubernetes cluster, you can create multiple namespaces for "environment isolation". When there are many projects and personnel, you can consider dividing different namespaces according to the actual situation of the project (such as production, testing and development). ...

MySql database is a relational database MySQL database is not case sensitive Some grammars in this article, such as goudan, dachui and Cuihua, are not fixed grammars and can be named arbitrarily data typeintegerint(m) m indicates the lengthLong integerbigint(m)Floating point numberdouble(m,d) m represents the total length d and the decimal po ...