Java

First, Java Concurrency FoundationWhen an object or variable can be shared by multiple threads, it is possible to cause problems with the logic of the program. There is a variable in an object i=0, there are two threads, a, a, I plus 1, this time

Process-oriented thinking: How do I solve this problem? And then fix it one step at aObject-oriented thinking: When you meet one thing, think about it, who do I want to do, and how he does it, not what I need to think about, as long as it's done in

Data types for JavaJava is a strongly typed language, which means that Java must declare a type for each variable. In Java, there are 8 basic data types and 3 reference data types. Basic data types 　　　Integral type: byte short int

This is used in SWT/JFACE development application The ORG.ECLIPSE.SWT.OLE.WIN32 package that SWT comes with can support inline OLE and ActiveX.The specific usage is as follows:Create a oleframe as an OLE (or ActiveX) frameworkOleframe oleframe = new

Java Exception HandlingExceptions are errors in the program, but not all errors are exceptions, and errors can sometimes be avoided. For example, your code is missing a semicolon, then running out of the result is the hint is error java.lang.Error;

: In Java development We will certainly use a lot of collections, here I will summarize the common collection classes, the advantages and disadvantages of each collection class, so that we can better use the collection. Now I'm going to use a

Write in front: This article for Java is already very good big hand, there is no need to read, because for you, this TM is simply too simple ....We have all experienced the interview, do you really understand the interview? For the interview I just

Thread communication example-producer consumer issuesThis kind of problem describes a situation, assume that the warehouse can only store one product, the producer will produce the product into the warehouse, the consumer will take away the product

Java Calendar class time operations, which is perhaps the simplest scenario for creating and managing calendars, the demo code is simple.Demonstrates the acquisition time, the accumulation and subtraction of date time, and the comparison.Original

Because the project needs more data query, the number is large, so to use the cache, in the case of non-reference Redis, only one speed of ascension1. Cache classpublic class Cache {Private String key;//Cache ID, storing values to HASHMAP based on

Convert a list collection to a JSON file and export:Data collection:New Arraylist(); MapNew hashmap<>(); Agencymap.put ("Agencyname", agencyname); Agencymap.put ("agencyaddress", agencyaddress); Agencymap.put

When---need finally:Before jdk1.7, all related operations involving I/O, we will use finally to ensure that the flow in the last normal shutdown. After jdk1.7, although all streams that implement the Closable interface can be defined in a try block,

constructor functionRequirements:In order to describe things more accurately, there are some initialized data when many objects are found that correspond to things. How this is done in the class. Done with another small technique in Java: the

/*** Normal Thread* This is the most common, create a thread, and then let it run in the while loop,* Through the sleep method to achieve the effect of timed tasks. This can be done quickly and easily, the code is as follows*/public class Task1

The original address: Java socket programming----communication is so refined Java was originally introduced as a network programming language, which provides a high degree of support to the network, which makes the communication between client

1. Production/consumer modelProduction/consumer issues are a very typical multithreaded problem, involving the "producer", "Consumer", "Warehouse" and "product". The relationship between them is as follows:(01) The producer will stop production only

Java reads and writes files in multiple ways.Multiple methods of reading files in java1. Read File Content in multiple ways.1. Read File Content by byte2. Read File Content by character3. Read File Content by row4. Randomly Read File Content*/Import

Examples of custom log4j2 log files in spring boot and log4j2 Background: BecauseLog4j2 is required for versions starting with spring boot 1.4.The supported formats are json and xml. This practice mainly uses the xml format to define the log

Java generates a random date in the specified range, and java generates a range There is a need to construct a method to randomly generate any time point between 00:00:00 and.The idea is as follows: in Java API, the Date type and long type are well

Heap sorting instance (Java array implementation) and heap sorting instance java Array Heap sorting: using a large heap The array is all written into the heap, and then inserted back into the array from the back to the back. The array is sorted from