Java

PMD and Checkstyle Depending on the PMD document, it checks the following sections in your code: Unused local variablesAn empty catch blockParameter not usedEmpty if statementDuplicate import statementUnused private methodsCould be a singletons

Today, in the CSDN forum, I was asked if the Java Neutron class inherits only the non-private variables and methods of the parent class (originally posted here). Most of the comments are considered correct, but the underlying understanding of the

Take full advantage of Java metadata, part 2nd: Customizing annotationsAuthor: Jason Hunter Learn how to write your own annotation types and use built-in annotations to control their behavior. In my previous article in this series, I introduced the

Fabric-sdk-java build and compile (this article is based on 1.0.1 version) 1, install jdk1.8 and above version 2, download Fabric-sdk-java GitHub address: Https://github.com/hyperledger/fabric-sdk-java 3. Import into Eclipse tools 4, switch to

After the use of Zabbix for monitoring, often because of the requirements of the project, the need for Zabbix data, two times to share and develop. How to obtain data from Zabbix is a problem to be solved in this practice. There are two ways to

Not much to say, directly on the code. Package com.ckw.test; Import Java.io.BufferedReader; Import java.io.IOException; Import Java.io.InputStreamReader; Import java.util.*; Import Java.util.Map.Entry; public class Testofsubnetmask {map Map =

Over time, the development of the front and back end separation is becoming more and more popular, the use of the company is more and more. But this form of development also poses a problem. That's a cross-domain problem. What is

writing a string to a file Method One public void Writestringtofile (String filePath) { try { file File = new file (FilePath); PrintStream PS = new PrintStream (new FileOutputStream (file)); Ps.println

Classes (Class) A rectangular box is used in UML to represent a class. Class diagram is divided into three layers, the first layer displays the class name, and if it is an abstract class, it is shown in italics. The second layer is the attributes

The code is as follows:1.maven Jar Required com.google.zxing core 3.0.0 com.google.zxing javase 3.0.0 2. Generate two-dimensional code: Package com; Import Java.io.File; Import java.io.IOException; Import Java.nio.file.

Start today with a deep study of Java threads, starting with the 3 functions of sleep,join,interrupt. Let's take a look at the functions of these 3 functions. 1,sleep: Is a static method of the thread class, which is to block the current thread, the

Shahelper.java PackageCom.util;/** * @authorWangxiangyu * @date: October 16, 2017 9:00:47 * class Description: Sha Signature Algorithm*/ Public classShahelper {Private Final StaticString[] hexdigits = {"0", "1", "2", "3", "4", "5", "6", "7", "8", "9

This article describes Java SE, Java EE, Java I made the difference and shared some of the author's achievements. Currently, Java platforms can be divided into three versions based on software developers, service providers, and equipment

Package mail; import java. Io. unsupportedencodingexception; Import java.net. malformedurlexception; Import java.net. url; import javax. Mail. Internet. mimeutility; import org. Apache. commons. Mail. emailattachment; Import org. Apache. commons.

Below I will summarize some of the Java frameworks and open-source projects for you, so that you can have a certain understanding of the Java frameworks in general.Spring framework [Java open-source Jee framework]Spring is a powerful framework that

Stack tracesBy Calvin AustinJuly 1998 It's the night before your product release. you run your final tests and then it happens -- you get a java stack trace. you look through your Java programming books, but this seems to be an area that's

Suppose we have obtained a Java object on the server side, and now we are considering how to convert this Java object into a string that complies with the JSON syntax. Of course, we can write a set of algorithms to implement this conversion, but it

Examples on the official website JSON-lib is a Java class package used to convert beans, maps, and XML into JSON and convert JSON back to bean and dynabean.: Http://json-lib.sourceforge.net/The third-party package is also required:Org. Apache.

[Reprinted from sweet potato, original post address] http://www.oschina.net/question/12_52027 The OSCHINA software library has a category-Web framework that contains nearly 500 projects in multiple programming languages. Web framework is the best

Today I encountered such a problem and solved it. I know what is going on. Java. lang class IllegalArgumentExceptionjava. lang. Object java. lang. Throwable java. lang. Exception java. lang. RuntimeException java. lang.