what immutable class

---- I haven't understood these two concepts for a long time. I finally found a good article to share it. 1. Both stack and heap are places where Java is used to store data in Ram. Unlike C ++, Java automatically manages stacks and stacks, and

The difference between string and stringbuffer can be said to be numerous online materials. However, when I saw this article, I felt that the small examples in the article were representative. So I made a summary.   There are three classes in Java

List of related Reading Notes No. 23 Check the parameter Validity For non-public methods, we should use the assertion method to check its parameters, instead of using the check statements that are common to everyone. If the development platform we

  The most data we operate on is text, so the content of string text is particularly important. Here is a summary. The character-related classes are as follows:   1. character. Character is an encapsulation object for char and an operation for a

Whether you are a new programmer or a veteran, you must have encountered a thread-related problem in your interview. An important feature of the Java language is the built-in support for concurrency, which makes Java popular with businesses and

If you want a custom class to support copy operations, implement the nscopying protocol (not the replication Copy method) or nsmutablecopying protocol.Copies of immutable versions:Nscopying protocol, the Protocol has only one method:-(ID)

I've already covered some of the builder pattern, which is a useful way to instantiate a class that contains several attributes (optional), and the benefit is easier to read, write, and maintain client-side code. Today, I will continue to introduce

Document Sorting, easy to view, reproduced from http://upgoing.blog.51cto.com/2112939/420972 All Java learners should understand the problems in this series. Unless you are only interested in learning Java. If you think you are a beginner, but you

1. Both stack and heap are places where Java is used to store data in Ram. Unlike C ++, Java automatically manages stacks and stacks, and programmers cannot directly set stacks or stacks. 2. The advantage of stack is that the access speed is faster

The differences between String, StringBuffer, and StringBuilder are the differences between String and StringBuffer. There are countless online materials. However, after reading this article, I feel that the small examples are representative. So let'

Objective-C (introduction to the Foundation framework) 05-Introduction to the foundation frameworkThe so-called framework in iOS is a directory. iOS provides many frameworks that we can call in applications. Many applications use frameworks such as

Use Java to pass values and references, and use java to pass references In Java, variables are divided into the following two types, 1. for basic type variables, Java is a copy of the value, and its own copy changes instantly, and it will not

I haven't come to the garden for a long time. Just after the Spring Festival, I want to say the following thing: Are you dating me? All said: lonely men play Dota, lonely women wear stockings. I think in this era, yundun will be able to go QQ, go

To understand how string works in Java, you must make it clear that string is an immutable class ). What is a non-mutable class? Simply put, an instance of a non-mutable class cannot be modified. The information contained in each instance must be

The StringBuffer class provides strings for modification. You can use StringBuffer when you know that character data is changing. Typically, you can use StringBuffers to dynamically construct character data. There are three classes in java to take

Java Collection framework: Java Collection framework Structure of the Collection framework: I. Collection Structure Framework: Ii. Set, List, Queue, and Map Set: the derivative interface of collection. Repeated elements -- equal () are not

The first thing to say is that Python does not have the same value-based arguments as in C and C + +. Everything in Python is an object, and that's what's great about it, it doesn't have a basic type. In Python, a type belongs to an object, and the

DOCTYPE generatorconfiguration Public"-//mybatis.org//dtd mybatis Generator Configuration 1.0//en" "Http://mybatis.org/dtd/mybatis-generator-config_1_0. DTD >can be used to load configuration items or configuration files, you can use ${propertykey}

Jelly FoundationReference: Https://wiki.jenkins-ci.org/display/JENKINS/Basic+guide+to+Jelly+usage+in+JenkinsUI Samples PluginThis plugin is used to show how to use the Jenkins UI controls based on stapler, Jelly, groovy and other technologies.

article intentionIn order to cope with the exponential growth of future online (especially wireless) traffic, the level of backend services needs to be increased, the latency and fault-tolerant management of services will face greater challenges,