Java

I. Configuration of the JDK environment variables1, download the JDK and install (the official website javase,64 bit (depends on how many bits of computer))Official website http://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-213315

ImportJava.util.*;/*Saves the custom object as an element into the ArrayList collection and removes the repeating element. For example: the Depositary object. Same name as the same age, as the same person. is a repeating element. Idea: 1, describe

This article mainly uses the Java mail and Spring Mail two ways to send the message tutorial, compared verbose, because in addition to send mail also wrote other tool class, but very detailed.1. Send mail using Java MailFirst, the relevant account

first, the implementation of the interface steps1, divided into 2 ways:1) inherit a top-level container class;2) JFrame as a property of the class.2, in the construction method inside, the design interface3. Create Interface classThe design

Ring Architecture Environment:Front-end Haproxy as reverse proxy, backend n+1 Tomcat+java serviceA problem occurred:The environment is new, this week in the beginning of the pressure test normal, with the increase in volume, causing the CPU has been

Javaconversions between collections and arrays@author IxenosArray to collectionarrays.aslist (T ... a) The first conclusion : Using Arrays.aslist (T ... a) to convert an array to a collection(T...A) is a variable parameter, as (t[] a) can be

I. TreeSet INTRODUCTIONLike HashSet is based on the HashMap implementation, TreeSet is based on the TREEMAP implementation. TreeSet is an ordered set, the elements in the TreeSet will be sorted in ascending order, the default is to sort by natural

The browser in the process of uploading the file as a stream to the server side, generally choose to use the Apache Open Source Tool common-fileupload This file upload component, Common-fileupload relies on the Common-io package, so the development

Implementing Java and. NET mutual calls via interfaces-jninterfaceUsing C # Programming for many years, but also very grateful to Microsoft in the language architecture, grammar sugar, editor, etc. to bring themselves to the convenience. But because

Public classThumbnailtest { Public Static voidMain (string[] args) {InputStream is=NULL; Try { //Get file Streamis =NewFileInputStream ("E:/test/1.png"); //third-party class libraries set picture size and output file pathThumbnails.of (IS)

Learn more things will find themselves more ignorant, recently read a variety of Daniel's blog and so on, deep feel their ignorance, waterfall sweat ... Put a positive attitude, slowly study, Hope Qinnengbuzhuo.ArrayList is a relatively simple Java

OverviewPrograms: program, is a static conceptProcesses: Process, is a dynamic conceptA process is a dynamic execution process of a program that occupies a specific address space. Each process is independent and consists of 3 parts Cpu,data,codeCons:

Before we get to the point, we need to introduce two very important actions for the stream type in Java 8:Intermediate and end Operations (intermediate and Terminal operation)There are two types of methods for stream types: Intermediate

Reference is an abstract class, and Softreference,weakreference,phantomreference and finalreference are the concrete classes that inherit it.Next, we will introduce and analyze the characteristics and usages of the strong references and the various

Using Java.io.file to create a file (folder) is the most basic knowledge of Java.The JDK API describes:The snippet code will look more clearly:File file1 =NewFile ("F:/AAA/BBB/CCC"); if(File1.mkdirs ()) {System.out.println ("Multi-tier folder

Java Reflection mechanismThe Java reflection mechanism is in the running state, for any class, can know all the properties and methods of this class, for any one object, can call any of its methods; This dynamically acquired information and the

1. Calendar Turn DateCalendar Calendar == Calendar.gettime ();2. Date Turn CalendarNew= calendar.getinstance (); Calendar.settime (date);3. Date and time of the acquisitionThe getyear () in date is deprecated and is used in the following ways:

To test the JSON string:{"Access_token": "Hkbql5o_l67dz7_vjratkbwtlk9yj5qymuojthar8baj0xwf4wxw1p4ym4itz3-ptwrrovtbcnjnyjglfed_ 4bb0hiqgp8v-axojuuk1tfs "," expires_in ": 7200," Refresh_token ":" _or_31yep8xhxgwvrazdwikxfflkjfb3itrpfan_ 3kpavqaplw6paw_

1.oracleThin driver Connection string: Jdbc:oracle:thin: User name/password @localhost:1521:cakeDriver class: Oracle.jdbc.driver.OracleDriver2.mysqlConnection string: jdbc:mysql://localhost:3306/database name?

Tomcat./catalina.sh JPDA StartThis command launches Tomcat, which listens on port 8000 and waits for the debugger to connect.Default Listener 8000 port, specify listening port by setting environment variable jpda_addressFor example, listen on port 80