put method

Original address: http://www.open-open.com/lib/view/open1381566882614.htmlFirst, Introduction Org.json is a commonly used JSON parsing tool in Java, mainly providing jsonobject and Jsonarray classes, which are now explained by the use of each class .

Parse and construct a json string using JSONObject and JSONArray. The JSON-lib package (the two most critical classes are JSONObject and JSONArray) completes the construction of json and the use of some basic methods. Differences: ① The string

Android and androidsdk I have previously written a Json blog. At that time, I used Gson package for parsing. This time I came here with org. json for parsing. Portal: Gson parsing complex Json dataJSON Structure (1) Name/Value Pairs (unordered):

In the first article, we introduced the two core objects in NiO: Buffers and channels, when it comes to buffers, we say that the buffer object is essentially an array, but it is actually a special array, and the buffer object has built-in mechanisms

ObjectiveJava Multi-threaded classification has written 21 multi-threaded articles, 21 Articles of a lot of content, personally think, learning, the more content, the more miscellaneous knowledge, the more need to carry out a profound summary, so as

Map container -- HashMap and common APIs, and put, get method parsing, generation and use of hash codes, maphashmap Map Interface ① Map is an object that stores key/value pairs. Given a key, you can query its value. The key and value are all objects;

A summary of multithreading problems1. What is the use of multithreading?A question that may seem a little ridiculous to many people: I can use multithreading, and what's the use of it? In my opinion, this answer is even more nonsense. The so-called

Idempotent is a very important concept in the design of distributed systemA idempotent method means that the result of a successful execution of a request does not depend on the number of times the method has been executed. Idempotent refers to the

Java Collection-HashSet, java-hashsetHashSet Overview For a HashSet, it is implemented based on HashMap. The underlying layer uses HashMap to store elements. Therefore, if you are familiar with HashMap, it is easy to learn HashSet. Let's take a look

LinkedHashMap, linkedhashmaplruLinkedHashMap LinkedHashMap is a hash table and Link List Implementation of the Map interface, with predictable iteration order. The null value and the null key are allowed. The difference between LinkedHashMap

ObjectiveJava Multi-threaded classification has written 21 multi-threaded articles, 21 Articles of a lot of content, personally think, learning, the more content, the more miscellaneous knowledge, the more need to carry out a profound summary, so as

Java NIO Reading NotesThe role of NIO is to improve program performance. Sometimes the performance bottleneck of the program is not the CPU, but the IO. At this time, NIO will be used. The principle of NIO is to use the underlying resources of the

In-depth research on containers-hash and hash code (2)Hash for speed: SlowMap. java indicates that creating a new Map is not difficult. But as its name SlowMap shows, it will not be very fast and should be abandoned if there is a better choice.

Java Collections FrameworkSet OR containerWe usually use arrays to save some basic data types. arrays are supported by the compiler, but an obvious disadvantage of arrays is that they have fixed sizes. In general, only when the program is running

Reprint Please specify source: http://blog.csdn.net/guolin_blog/article/details/39345833After studying the previous articles, we have already mastered the functions of Litepal's Table management module very well, I believe that we have realized the

Next, I would like to review the TCP/IP protocol family related things, of course, most of these things were learned in college, but that sentence, the basis of things still need to review the back of the time. The next few blog is about the TCP/IP

How to useOverview Concurrenthashmap:Thread safety;It segment the entire hash bucket, that is, the large array into a few small fragments of segment, and each small fragment segment above the lock exists, then insert the element should first

Points:1. The collection interface provides common methods for all collection classes (except mappings, which are described by the map interface)2, the list is an ordered set, where each element has an integer index3. Set is optimized for efficient

1. TreeSet class overview:• ability to sort elements according to a certain rule.• or sort according to the comparator provided when the set was created• Depending on the construction method used2. code example:1 Packagecn.itcast_05;2 3

Yesterday, I saw a discussion about the set: the elements in the Set cannot be repeated. How can we tell whether the elements are repeated? Is = or equals () used ()? What are their differences? Many people give the answer: the elements in the Set