Java

Recently the company lets do a document upload function, function description is probably such a dropBook name, book pricing, book cover pictures (need to be uploaded), document content (need to be uploaded), and other related descriptive

LIST(1) List is a sub-interface of collectionFeatures: Orderly (the storage sequence and the order of removal), repeatable.(2) Unique traversal capabilities of the list collectionA: Combined by size () and get ().Example:for (int x=0; xString s =

Set(1) Features of Set setUnordered (deposit and Fetch order), unique(2) HashSet CollectionA: The underlying data structure is a hash table (is an array of elements as linked lists)B: Hash table bottom-dependent two methods: Hashcode () and Equals ()

Share with us! Beloved Java 10 most extensive areas of reality using Java 30 Lessons from writing Java code Does the substring of Java strings really cause memory leaks? Java Memory prototype and working principle in depth

Reference: http://blog.csdn.net/xuefeng0707/article/details/40834595From JDK1.2 onwards, there is HashMap, as the previous article said, HashMap is not thread-safe, so you need to be extra careful with multithreaded operations.In JDK1.5, the great

There is N children standing in a line. Each child is assigned a rating value.You is giving candies to these children subjected to the following requirements: Each child must has at least one candy. Children with a higher rating get more

Polymorphism is the most important concept in object-oriented. Polymorphism occurs when an object, compile-time type and run-time type are inconsistent. Or, when an object, using the same method, has a different running state, indicating that

Given an array of integers, every element appears twice except for one. Find the single one.Note:Your algorithm should has a linear runtime complexity. Could you implement it without using extra memory?Problem Solving Ideas:Bitwise XOR operation,

my summary, opinion, if there are different opinions, you have the guts to say! 1. Self-study ability . Can be based on the existing problems to use Baidu and Google to find the answers you want, can't find the key words to remember the change 2.

map Map = new hashmap (); Map.put ("DisplayName", "TestValue"), map.put ("DisplayVersion", " xxx "); String commandprefix = "cmd.exe/k reg add"; String key = "\" hkey_local_machine\\software\\microsoft\\windows\\currentversion\\uninstall\\{ Edb3be72-

• Single Case classSingle-instance class, where the class can only create one object, guaranteeing the uniqueness of the object instance.Example: Single-instance classClass Singleton { private static Singleton instance; Use the static modifier,

1. Regular expressionsA regular expression is a sequence of formatting rules that describes a string using a series of predefined special characters, and then uses that formatting rule to match a string for formatting requirements.1) "." and "\"     

Due to the limitations of mobile device memory in mobile development, it is often necessary to consider the number of bytes consumed by the data type used. Below is a brief introduction to some basic data types in Java to deepen your memory.There

To configure a bean in an XML file through a bean node Name of the Id:bean Must be unique within the IOC container. If the ID is not specified, spring automatically assigns the privilege class name to the Bean. ID can specify more than one name,

A linked list is given such this each node contains an additional random pointer which could point to all node in the list or null.Return a deep copy of the list.Problem Solving Ideas:We made a copy of the diagram in the Java for Leetcode 133 Clone

The most common inner class is the member inner class, also known as the ordinary inner classHow to use a member's inner class :1. Methods in the inner class can access data in the external class directly, not affected by the access control2.

Class water{//Reservoir type Static Object Water=new object (); static int total=6; Suppose that the reservoir can have a total water content of 6static int mqsl=3; Suppose the reservoir has a water content of 3static int ps=0; Assuming the

I. BACKGROUNDFront-end time, self-made projects need to pack features, do not want to draw outside the jar packageAnd then did the function with Java.util.zip.Second, the application scenarioGenerate multiple files, such as Word, Excel, XML, and

JAVA iterator learning-Implementation of linear table iterators in JAVA, java linear 1. The iterator is an object that can traverse data structures such as a set (ADT implementation. In the traversal process, you can view, modify, add, and delete

Java multicast MulticastSocket In unicast mode, the server and client are different. In multicast mode, each end uses a vro or vswitch as a transit broadcast station, any end sends messages to a vro or vswitch. A route or vswitch is responsible for