Java

Basic course of-javase in layman's knowledgeExplains the basics of Java in depth. The history of Java, Java Basic syntax, arrays, classes and objects, inheritance and polymorphism, exceptions, paradigms, collections, streams and files, reflection,

Character Stream is based on characters when reading and writing filesCore classes of character streams in I/OThe reader and writer classes are the parent classes of all character stream classes, as well as abstract classes. FileReader and

1. JDK Download and installationJdk--java SE Department Kit Java Environment PackJre--java Runtime Department Java Runtime EnvironmentPath configuration: Find the path to the Javac.exe file, Javac.exe used to compile the source file such as: C:\jdk1.

Requirement Description: Use Java to crawl Web page information and return it as a string. Implemented using Java code:

http://www.chinaitpower.com/A/2005-01-14/104881.html using Java.util.Calendar to return the interval of days       StaticintGetdaysbetween (Java.util.Calendar d1, Java.util.Calendar D2) {         if(D1.after (D2)) {//Swap dates so D1 are start and D2

For a normal object, if you implement the Cloneable interface and override the Clone method, you can implement a deep copy of the object.However, for collections such as List/set, whether the clone method of the collection or the object is a shallow

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Write cookies: Cookie cookie = new Cookie (constants.cookie4sessionname, Session.getsessionid ()); Cookie.setpath ("/");//Set Root path Cookie.setdomain (". baidu.com");//set access domain, primary domain and subdomain can share cookies or set cross-

Atoi is a function that converts a string to an integer, how does it work with Java? Looks simple, traps a lot, in the Leetcode website, this function can write completely correct probability only 14%.atoi's need Is this: If there are

In Java 5, import statements have been enhanced to provide even more powerful keystrokes, although some argue that this is at the expense of readability. This new feature becomes static import.When you want to use a static member, you can use this

Spring Exception Java.lang.ClassNotFoundException:org.springframework.web.context.ContextLoaderServlet Scenario 1: Project does not add Jar package reference Case 2: (The most ridiculous error ~) your project jar packages may all be referenced and

Java implements statistics on the number of times a string appears in another string. Regular expressions are not allowed to be used during interviews. Fortunately, this algorithm is still simple, but writing on the draft paper will inevitably lead

Java Network Programming Note 3 Refer to the following code for how to use POST and GET requests to send requests to the Web site:   Import java. io. bufferedReader; import java. io. inputStream; import java. io. inputStreamReader; import java.net.

(11) reading (big talk Design Model) Abstract Factory Model After learning the design pattern for a while, there will be an individual meeting on the design pattern, that is, the design program follows some principles to make the code reusable,

Getting started with CountDownLatch thread synchronization in java A synchronization helper class that allows one or more threads to wait until a group of operations are performed in another thread. Two inverted-count latches are used below: one is

Java serialization example The Seerializable interface does not have any method, so the implementation is still empty ., It is called the mark interface package serialization; import java. io. fileInputStream; import java. io. fileOutputStream;

Differences between HashMap and ConcurrentHashMap HashMap has been available since JDK1.2. As mentioned in the previous article, HashMap is NOT thread-safe. Therefore, you must be extremely careful when performing multi-threaded operations. In JDK1.5

Data Structure and algorithm 4: Maze path)Data Structure and algorithm 4: Maze path) Preface This section describes two typical maze algorithms in the textbook [1] [2. Pay attention to the application of stack. If you have any suggestions for

Relationship Between Spring beans and SpringBean Relationship between beans: inheritance and dependencyInherit bean configurations Spring allows inheritance of bean configurations. The inherited bean is called the parent bean, and the bean

InetAddress getLocalHost function, Today, we encountered a strange problem when running the DemoService 2.5.4-SNAPSHOT version of dubbo. Consumer cannot connect to provider services. It was finally discovered that dubbo's own local IP address