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Concurrent Sets 1. Concurrent Problem of Ordinary Sets I learned about List (ArrayList|LinkedList), Set (HashSet|TreeSet), and Map (HashMap|TreeMap) collections, which are only suitable for single-threaded use. If multiple threads operate on ...

The command line of JDK is certainly one of the most familiar commands for general developers, such as java,javac,javap. However, there are many other command line tools under jdk/bin that are used to monitor the status of the JVM when it is running. Here's a detailed explanation of several commonly used tools and how to use them. jstack jstack ...

Channel (Pipeline) 1. Introduction Basically, all IOs start with a Channel in NIO. Channel is kind of like a stream. Data can be read from Channel to Buffer or written from Buffer to Channel. Here is an illustration: Some major Channel imp ...

3. JDK Concurrent Container Concurrent collection Concurrent HashMap: This is an efficient concurrent HashMap. You can understand it as a thread-safe HashMap. CopyOnWriteArrayList: This is a List, which is a family of ArrayLists by name. In the case of reading more and writing less, this List performs very well, far better than Vector. C ...

Proxy pattern: It is a design pattern that provides additional access to the target object, that is, access to the target object through the proxy object, so as to provide additional functional operations and expand the function of the target object without modifying the original target object. In short ...

There are two serialization strategies adopted by redis by default, one is String's serialization strategy and the other is JDK's serialization strategy. There are several serialization tool classes: GenericToStringSerializer: Any objec ...

Links to the original text: https://www.javadoop.com/post/nio-and-aio The last article introduced the basic operations of Buffer, Channel and Selector in Java NIO, mainly some interface operations, which are relatively simple. This article w ...

Content Introduction: Method Reference Demo Details Reference through five grammatical usage methods Method Reference Usage Summary 1. Method Reference Demo in Java 8 1.1 Background for Methodological References When we use Lambda expressions, the code we actually pass in is a solution: what parameters to do with. So consider a case: if we ...

This article provides a brief description of arrays and basic usage of concepts and arrays. I. Basic concepts of arrays 1.1. The Status of Arrays Arrays are one of the most important data structures in any programming language. At the same time, different languages have different implementations and pro ...

This article is from https://my.oschina.net/u/3235888/blog/832895.   Preface Wechat applet API document: https://mp.weixin.qq.com/debug/wxadoc/dev/api/api-login.html In the actual development of small programs, users are often required to authorize login and obtain user data to quickly dock with user systems. openId: User's unique identi ...