Java
-
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…… -
-
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! -
-
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…… -
com. sun. org. apache. xerces. internal. impl. io. Malformedbytesequenceexception: invalid byte 1 of UTF-8 sequence of 1 byte.
Try to modify the mapper registration method 一、具体到xml文件 <mappers> <mapper resource="code/dwx/mapper/…… -
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……