Java
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I / O input / output & redirection in Java
FileReader FileInputStream PrintStream OutputStreamWriter ObjectOutputStream Redirect -
Foreach () and iterator in Java and those things that enhance the for loop
List. forEach() Example The underlying implementation of foreach() Summary Iterator Introduction to iterators Iterator…… -
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Java Arrays. Lightning protection for aslist()
Arrays. asList() Quick create list Create using java8 stream -
Java hand tear HashMap
HashMap Relationship between hashcode and equals Override hashcode and equals methods Iterator for map Map. Entry< …… -
ACM essential fast input / output (Java)
Handwriting input class BufferedReader StringTokenizer Static input method StreamTokenizer -
Java course practice – student information management system
In 2020, the comprehensive course practice of Java & data structure was conducted. Due to the lack of ability, it …… -
Use of Java comparator comparingint()
comparingInt Custom sorting parameters Priority queue, override comparator -
Java Data Formatting & retain the specified number of digits after the decimal point
DecimalFormat NumberFormat Formatter String. format printf() Construction method Specific examples matters needing att…… -
Arrays. Precautions for using sort()
Arrays. Precautions for using sort() Thanks to the big guys in leetcode, learn from each other and come on! -
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Java learning history (I)
1、 Classes and objects 1. Create class Create a student class and create member variables and methods public class st…… -
Using commons toolkit to upload files
1、 First, import the Commons IO / and Commons fileUpload / packages 2、 Writing servlets import org.apache.commons.f…… -
NPM management command
We can easily download JS library and manage front-end projects through NPM. Node. JS the location of the NPM package …… -
Java basic syntax (2) – basic data types
preface You can directly copy other people's notes, only do typesetting and combing, and you may add your own opinions…… -
Some differences between web and game development
preface Recently, due to preparing for the final exam and preparing for internship. In fact, I haven't written a blog …… -
Nginx common commands
Windows View help information Nginx -h View nginx Version (lowercase V) Nginx -v In addition to version information,…… -
Map and set about iteration
We have learned about the following complex data structures: But this is not enough to deal with the reality. This is …… -
A small problem with Vue
NetWork Error 1. The first case It is a common cross domain request error. At this time, you only need to add the "@ c…… -
A simple understanding of memory in Java
1、 JAVA memory partitioning It is divided into five parts. You can refer to this note for a brief understanding: http…… -
JDBC learning (I)
JDBC learning (I) concept The so-called English abbreviation means: Java database connectivity, that is, the connectio…… -
Algorithm summary (I)
1、 Solving steps 1. Problem analysis The information analysis given in the title and the description of the review pr…… -
The idea compiler reports content of collection are updated, but never queried on variables
background I haven't seen you for a long time. When I write java with idea and declare HashMap, it turns yellow becaus…… -
Exception, thread
Chapter I exceptions 1.1 abnormal concept Abnormal means abnormal. In life: the doctor said that there is an abnormali…… -
Some problems about < packaging > in maven
1、 Packaging type of the project jar Default packaging format war Packaged into projects to be deployed pom The paren…… -
My java data stack – start
preface In the process of learning Java, to tell the truth, I still read a lot of Java materials from the training str…… -
Simple understanding of JAVA memory partition
Java's memory is divided into five parts So what are the five parts? Follow me down! Introduction: each program needs …… -
SSM configuration file record (I)
1、 Personal environment Jdk8，Maven3. 8，Tomcat9，IDEA 2、 POM xml Dependent packages: Junit4. 12 mybatis3. 5.6 mysql…… -
Apache HTTP server and Tomcat integration learning record
preface In fact, there are many tutorials on the Internet, but the problem is that it is difficult to find one with hi…… -
Four permission modifiers and six non access modifiers in Java
1、 What are the four access modifiers? 2、 A brief understanding of four access modifiers 1. Public permission modifi…… -
Simple use of eclipse tools
preface Although it's better to write java with idea, I still have to keep pace with my teacher when I'm in college. H…… -
Layered idea in Java Web Development (1)
1、 Understanding Dao, service and controller layers DAO（Data Access Object） 1. Direct look at English means "data a……