1. What is a JVM?
java virtual machine - the running environment of java programs (java Binary Bytecode operating environment)
2. Benefits of JVM
The cornerstone of writing once and running everywhere [key]Automatic memory management, garbage collection function [key]Data subscript out of range checkPolymorphism, object-ori ...
Posted by mike0193 on Fri, 12 Aug 2022 21:44:05 +0300
?? More relevant knowledge??
1, View exception information
??public void printStackTrace()??public String getMessage()??public String toString() 2, Exception handling - throws declares an exception
1. Why do I need throws?2. Format of throws
? Code demonstration 3. Usage scenarios of throws4. Notes on the ...
Posted by Antnee on Wed, 10 Aug 2022 21:37:40 +0300
Java thread pool multi thread query database to improve query efficiency
Company data statistics report query, several large table Association query, including cross database query, data associated query, data filtering, data statistics.
Main table data 1
Main table data 2
Posted by ryadex on Tue, 09 Aug 2022 22:06:04 +0300
?? Blog homepage: ****
?? Series column: uiautomation
?? Welcome to like?? Comments??
I love python and look forward to growing up with you!!
Purpose: use uiautomation to get wechat friends and store them in txt files.
2, Specific steps
Enter address book management
Posted by lizzyd on Tue, 09 Aug 2022 13:03:39 +0300
Yesterday, a fan friend also wanted to learn how to develop Web, applet and Android. He asked if he could learn it in college?
What I learned in school is really limited:
In many colleges and universities, some professors are academic, and they have not done much development work. In class, they just follow the book, and their knowledge point ...
Posted by skali on Thu, 04 Aug 2022 21:47:07 +0300
Some of the most basic methods of storing and reading Bean objects have been described before, but they are not used in Spring at all. So this blog will introduce a simpler method of storing and reading Bean objects. The core of what you want to do is to use annotations. Let's take a look below.
?? Store Bean Objects
Posted by The14thGOD on Thu, 04 Aug 2022 21:30:46 +0300
✅🎡 Personal homepage: Program ape chase
✅🎡 Series column: Algorithm set
✅🎡 Current status: create Java learning road (zero foundation to employment practice) series, which is currently updated to JAVAWEB development
✅🎡 About the author: Hello, everyone. I'm a program ape chaser, a new star creator in the whole stack field, an ...
Posted by grandman on Wed, 03 Aug 2022 22:19:23 +0300
MySQL - slow query log analysis
1. Start and set slow query log2. Data preparation3. Slow query log analysis tool: mysqldumpslow4. Delete slow query log5,show profile
MySQL - slow query log analysis
MySQL's slow query log is a kind of log record provided by mysql. It is used to record the statements whose response ...
Posted by razvypp on Tue, 02 Aug 2022 21:39:47 +0300
Differences between LRU and LFU
Both LRU and LFU are page replacement algorithms for memory management.
LRU: Least Recently Used (longest time) elimination algorithm. LRU is the page that has not been used for the longest time.
LFU: Least Frequently Used. LFU is the least used page in a period of time.
Assume that th ...
Posted by latinofever on Mon, 01 Aug 2022 21:07:12 +0300