Java

First, some methods in the API**Arrays Tool Class**1. ConceptTool classes for array manipulation2. Member MethodsA) ToString (): public static string toString (data type [] variable name)--turns the array into a stringb) Sort (): public static void

1.UUID IntroductionUUID meaning is a universal unique identifier (universally unique Identifier), which is a software construction standard and is also open Software Foundation, OSFOrganizations are used in a distributed computing environment

In Java Regular expressions, quantifiers (quantifiers) allow you to specify the number of occurrences of a match, for convenience, under the current Pattern API specification, describe greed, reluctance, and embezzlement of three quantifiers. First

Method Definition: Method name, return value, parameter list, modifier (permission modifier, final,static), implement body.Reference from: Java Programming and Engineering practiceSignature of the method:The only element that distinguishes the other

Start around May 10, 2015, ready to use Java to do a gesture recognition related things, gesture recognition related content has been done, need to solve is to use the camera at 10 times per second read the image.Baidu began to use a circle, said

One: Example of threading operations ( 1 )Package com.cloud.day6;public class Demo1 {publicstatic void Main (string[] args) {Mythreadmt1=new MyThread ("Thread A", 1000);Mythreadmt2=new MyThread ("Thread B", 2000);Mythreadmt3=new MyThread ("Thread C",

1. For socket closure, there are 3 ways to close the socket connectionSocket.close ()Socket.getoutputstream (). Close () #socket关闭后调用该方法会抛异常Socket.getinputstream (). Close () #socket关闭后调用该方法会抛异常2. public void Connect (socketaddress endpoint) throws

Public classMaputil { Public StaticObject convert2object (Class clazz,map Map)throwsintrospectionexception, instantiationexception, illegalaccessexception{BeanInfo bi=Introspector.getbeaninfo (Clazz); Object obj=clazz.newinstance ();

Brief introductionThe sockets were originally called Berkeley sockets, since the university was originally invented by Berkeley. In Java, it is convenient to call the socket for network communication. Below, try to read and write data to the remote

The process of writing an object into a stream is a serialization (serilization) process, but in the Java programming Circle it is also very visually called a "frozen" or "pickled pickle" process, while the parallelization (deserialization) process

MD5 Overview MD5 is a message Digest algorithm 5 (Information Digest algorithm 5) to ensure complete and consistent information transmission. is one of the widely used hashing algorithms of computers (also known as digest

Package Com.fengyunhe.helper.image;import java.io.*;/** * Picture base64 * Created by Yangyan on 2015/8/11. */public class Imagebase64utils {public static String bytesToBase64 (byte[] bytes) {return ORG.APACHE.COMMONS.C

How to customize annotations Target Retention Inherited Documented How to use custom annotations Demand Realize Run results How to customize annotationsHere is a custom

Use TreeMap to count the number of words and output words and bibliographies, with words sorted in ascending orderTreeMap is characterized by a non-repeating element, and the key value of the element can either be sorted by default comparable

Java crawler WebcollectorCrawler Introduction:Webcollector is a Java crawler framework (kernel)that requires no configuration and is easy to develop two times,providing a streamlined API that enables a powerful crawler with a small amount of code.

Title: Enter n integers to find the smallest number of K. For example, enter 4,5,1,6,2,7,3,8 these 8 numbers, then the smallest 4 numbers are 1,2,3,4The simplest way of thinking about this problem is to sort the n integers in the input, and the

Daemon Threads in JavaThe daemon thread in Java differs from the concept of a daemon thread in Unix, where the daemon thread in UNIX is the equivalent of a service, running in the background, and the daemon thread in Java is defined like this:

First, Introduction to JavaAs for the history of Java, many online, interested students to understand it, the initial stage only to do a brief introduction, the latter useful to the place in the detailed explanation, if there is doubt, you can

Title: Two numbers in an array if the previous number is greater than the number that follows, then these two numbers form an inverse pair. Enter an array to find the total number of reverse pairs in this arrayFor example, in the array {7,5,6,4},

Java annotations, from the name, are comments, explanations. But the function is not simply a comment. Annotations (Annotation) provide a formalized way for us to add information to our code, which we can use at a later time (by parsing annotations