Java

Original link: http://www.sjsjw.com/kf_cloud/article/020376ABA013802.asp purposeReal-time monitoring of a directory of log files, such as the new file to switch to a new file, and synchronously write to Kafka, while recording the log file line

1. In Java5, a new Java.util.Queue interface is added to support the common operation of the queue. The queue interface is the same level as list and set, and both inherit the collection interface.To avoid collection's add () and remove () methods

Original: http://ini.iteye.com/blog/2007835During the interview, you will often encounter such questions: give you two classes of code, they are inherited relationships, each class only constructor methods and some variables,There may be another

interfaces : Functions of classesLight LT = New Light ();Lt.on ();Hidden : How a class member/interface function exists (in the way it is used)PublicPrivateProtectedThe difference between reuse and inheritancemultiplexing : Automotive Containment

When Jigsaw was finally released in Java 9, the project had a history of more than eight years.Reproduced in: http://www.itxuexiwang.com/a/liunxjishu/2016/0228/180.html?1456925937In the first few years, it had to compete with two other similar Java

Many times we need to convert a byte array into a 16 binary string to save, such as when I am I/O byte stream operation, especially in a lot of encrypted scenes application is more extensive.In Java, Byte uses a binary representation of 8 bits, and

CustomA reference type indicates that the data you are manipulating is the same, meaning that when you pass a parameter to another method, you change the value of the variable in another method,Then calling this method is the value of the passed

The last two days the company is more, these two days to deal with the main XML, and today, a little bit of Java to manipulate XML a small example.The original operation of XML has been used this package: Xstream-1.4.2.jar. And then, in the way of

In the previous article. We have listed several conclusions about calculating the size of Java objects and the use of Jol tools, and the source code of the Jol tool is interesting to look at. Now we use the Sun.misc.Unsafe in the JDK to calculate

Here is a summary of the steps to find the thread resource consumption problem for Linux, Sun (Oracle) JDK, in Linux, when the Java process is found to occupy a high CPU resource, and want to further find out which Java thread is consuming CPU

You can define another class within one class, which is called a nested class (nested classes), and it has two types: static nested classes and non-static nested classes. Static nested classes use little, and most importantly, non-static nested

Java garbage collection mechanismWhen it comes to garbage collection (garbage collection,gc), many people naturally connect it to Java. In Java, programmers don't have to worry about memory dynamic allocations and garbage collection issues, all of

There are too many open files, generally due to improper use of resources by the application, such as not shutting down the socket or database connection in time. However, it is also possible that the application does need to open more file handles,

Company needs every year, this year a little special, haha.Suddenly added a demand, said to achieve the Chinese character to pinyin query.In the effort to write out, now share it!!/** * Kanji Pinyin abbreviation * * @param str * character string to

Java: JDBC and java JDBCJDBC is called Java DataBase Connectivity (java DataBase connection ). To simplify and unify database operations, SUN defines a set of Java database operation specifications, called JDBC. To put it simply, JDBC is used to

Java development starts from scratch, and java starts from scratch When I started to learn Java, I felt more fragmented than. NET. So I wrote a post to record the pitfalls I had stepped on, which were not easy to find on the Internet. 1. java

Servlet filter, servlet I,FilterIntroduction and use What is a filter? Similar to Servlet, a filter is a web application component that can be bound to a web application. However, unlike other web application components, filters are "Links" in

Chapter 2 Javac compilation principles and javac compilation principles Note: This article mainly records from the "in-depth analysis of java web technology insider" Chapter 4 javac compilation principles" 1. Functions of javac Convert *. java

Study Notes 2, struts2 Study Notes + =,-=, * =,/= Implies forced type conversion. In logical operations, the difference between & and & is: &: No matter whether the left side is true or false, all operations are performed on the right side. &: If

Automatic data type conversion (Java), data type conversion java Public class Test {Public static void main (String [] args){Int a = 3; // poorDouble B = 1.5; // richDouble c = a + B; // The addition is rich. If c is defined as an int type, an