Do you really know Java generics
Generic variables are capitalized. In Java libraries, the variables E represent the element type of the collection, K and V represent the key and value...
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Tag: java
Java8 lambdas, functional interfaces, Stream usage and principles
January 16, 2024
by Manikya Goswami
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Java turned 25 years old this year, older than some of the teenagers in this room, but unfortunately not older than me. Java is too...
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Upgrades to synchronized locks (bias, lightweight, and heavyweight)
January 16, 2024
by 黃淑華
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Synchronized is an implicit Lock built into the JVM (as opposed to locking, implicit locking and release).
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90% of Java programmers are misled by a performance optimization strategy
January 16, 2024
by Ryan Hodson
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We often see books or ideas about Java performance tuning, such as 44 Java Code Performance Tuning Summaries. The idea is not to define variables...
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90% of Java programmers are misled by a performance optimization strategy
January 16, 2024
by Dr. Angela Moran
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We often see Java performance optimization books or philosophies that say, don't define variables inside a loop, because it takes up too much memory and...
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Java architects must read the source code of Tomcat original
January 16, 2024
by Divit Rattan
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The topmost container in Tomcat is Server, which represents the entire Server. As shown in the figure above, a Server can contain at least one...
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Java Export Excel best practices, Java Large file Excel avoid OOM(Memory overflow) Excel tool framework
January 16, 2024
by 胡欣怡
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The product manager needs to export all the information for a page to an EXCEL file. Excel export is a very common requirement. The most...
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AQS analysis of Java Concurrency
January 16, 2024
by Robert Wiley
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The first part of the preface analyzes the details of AQS implementation of shared/exclusive lock and some difficult points, this part continues to analyze the...
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2021 Latest and most comprehensive “Java knowledge summary + Interview Guide” strongly recommended!
January 16, 2024
by Krystal Mason-Duncan
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The pandemic of 2020 has made job interviews even worse. There are many big companies, such as Tencent and Bytedance, whose recruitment quota has been...
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Java essential Basic operations ————-Io operations (byte stream notes)
January 16, 2024
by Beth Robinson
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When we read and write files, we need to take memory as the reference. Output: If we save data from memory on the hard disk....
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SpringBoot integrates the SpringDataJPA tutorial
January 16, 2024
by 張佳穎
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We can then call some of the methods in the LuckmoneyRepository parent class to operate on the database. Compared to the way Java Web JSPS...
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ThreadLocal variables (ThreadLocal)
January 16, 2024
by Lisa Tran
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We see that if you get first, then you go to set. I found a very strange constant, but I didn't know where it came...
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The Java collection architecture summarizes sets, lists, maps, and queues
January 16, 2024
by Martyn Williams
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Sometimes we need to store more than one piece of data in one place. In general, arrays are a good choice if we know exactly...
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Write a producer/consumer pattern
January 16, 2024
by Robert Wiley
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I have learned the producer/consumer model for so long that I finally realized it today. Before WRITING, I will review the producer/consumer model. The producer/consumer...
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Spark from zero to development (5) Introduction to Spark SQL
January 16, 2024
by 袁俊傑
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One use of Spark SQL is to execute SQL queries. Spark SQL can also be used to read data from an existing Hive installation. When...
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The Top 100 Java libraries of 2017 — based on an analysis of 259,885 source code
January 16, 2024
by Nayantara Devan
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The Top 100 Java Libraries in 2017-based on 259,885 Source Files. A year has flown by, as if we just analyzed it from GitHub yesterday...
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Get rid of Gson generic encapsulation
January 16, 2024
by Janet Robertson
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Do you really know how to use Gson? In section 3 of the Gson Usage Guide (I), I explained how generics can be used in...
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Education is not enough technology to gather together, college students counter-attack into Ali to take millions of annual salary
January 16, 2024
by 解琬婷
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In 2020, YQ broke out, the stock market was unstable, the relationship between countries was unstable, and the domestic market economy was depressed. Under such...
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Java from single to micro services to create a real estate sales platform
January 16, 2024
by 解琬婷
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Microservice is a very popular architecture in recent years. It is a necessary skill for senior back-end development engineers. Based on the real estate sales...
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Spring Boot2.x: Spring Boot2.x: Spring Boot2.x: Spring Boot2.x
January 16, 2024
by Dr. Lawrence O'Brien
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At present, the Internet technology is popular, and Java Internet technology dominated by Spring framework has become the mainstream. Spring Boot, derived from Spring technology,...
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Elastic Search practices in SpringBoot
January 16, 2024
by Mary Roberts
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You'll need to install Elastic Search, and you'll need to install elasticSearch-Head to see your data visually.
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(8) Container class
January 16, 2024
by Catherine Wells
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The diagram above shows the inheritance relationship of classes involved in Java Collection framework. From the perspective of Collection classes, it can be divided into...
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A gadget that Java programmers can never live without
January 16, 2024
by Trevor Curtis
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I remember years ago, I used to do this kind of thing, code this kind of code. Today, I'm going to go back and do...
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One question, got you a mechanical keyboard, blah, blah
January 16, 2024
by Harriet Thompson-Hughes
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Jin Yong died, but technology is still alive. I have been in the world of technology for several years, and I have asked countless questions...
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Case study: Production data was changed to 0 due to the misuse of a double quote in the UPDATE statement
January 16, 2024
by Kabir Ahuja
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A, preface Recently often encounter development error delete error update data, this, they gave me a trouble, we look at the whole process. As the...
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Best Practice for processing unstructured data on MaxCompute(ODPS)
January 16, 2024
by Ivana Behl
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With the release of MaxCompute (ODPS) 2.0, the new unstructured data processing framework is also introduced in a series of articles, including how to access...
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Say goodbye to inefficient IO and go back for a new wave of Java 7 nio.2 features
January 16, 2024
by Dean Wright
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Java 7 includes automatic resource closing, Switch String implementation, try-catch, and binary writing. For details, see the original article (a list of Java 7 syntax...
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SpringMVC source code 3- Existing HandlerMapping HandlerAdapter
January 16, 2024
by Marie Anderson
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From the previous articles, we learned that we can get the handler we need from HandlerMapping based on the URL. With handler, we can handle...
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In addition to FastJson, you should also learn about Jackson (2)
January 16, 2024
by 胡欣怡
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The previous article introduced the ObjectMapper in Jackson and how to use it to serialize and deserialize between Json and Java objects, and concluded with...
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The Path to Expert God for Java Programmers (2020)
January 16, 2024
by 李馨儀
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As the first major programming language, Java has a long history. Generation after generation of Java programmers have been learning Java. How will the learning...
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