Java

①for-each Loop ② Inheritance concept ③ Full class name ④ method rewriteFirst, For-each cycleWhen iterating through each element in the collection, one of the for loopsint [] A = {n/a};for (int result:a) {SYSTEM.OUT.PRINTLN (result);}All in turn, but

1.import java.io.*;Java.io.* is not a file, but a set of classes. It is all the classes in the Java.io package, * is a wildcard, for example a*.txt represents all txt files that start with a, "? "is a wildcard of a single word, such as a?. TXT

publish Java Web Apps on Azure websitePublishing Java Web Apps on an azure site is easy, you can use Git to publish from source code, or you can use Ftp/ftps to publish directly, this section describes the FTP approach. Prepare your Java

Learning JAVA environment is set up under the JDK and install, configure environment variables工欲善其事, its prerequisite. To learn a good java language, you must first build the environment to develop and run the Java language, and in the course of

When we learn spring, we know that spring has two main ideas, one is the IOC, the other is AOP, and for IOC, dependency injection doesn't have to be said, and for spring's core AOP, we not only need to know how to satisfy our function through AOP,

The meaning of the access modifier in Java, public, private, PROTECTE, default, is explained:Public (interface Access): The most restrictive modifier in the Java language, commonly referred to as "common". The classes, properties, and methods that

"Practical Java High Concurrency Programming 1" Pointers in Java: unsafe class"Practical Java High Concurrency Programming 2" lock-free object reference: Atomicreference"Practical Java High Concurrency Programming 3" object reference with timestamp:

1. What are the benefits of the strategy model?The advantage of the strategy pattern is that you can dynamically change the behavior of the object.2. Design principlesThe design principle is to extract the parts of a class that are often changed or

the jmx of JavaThe definition and architecture of JMX is unknown, see Baidu Encyclopedia:Http://baike.baidu.com/link?url=6QzGGEqphTmpft3ll5mXmDNVRdvLRZhkvGaqAWyO6EliwrHeIwt5bdMd188iMlzylxoxr7gRbtIWn2NQODBLZacode example:It 's no different than

Always think that Java 's method parameters are passed values, after the call does not affect itself. Java does not have a pointer in C + + , in the fast sort, the incoming array, but the value of the change occurred. This leads to thinking:For the

Thread life cycle:Thread pool: A technique for pre-creating threads. The thread pool creates a certain number of threads, puts them in an idle queue, and then re-uses the resources before the task arrives. Reduce the frequent creation and

The previous several analyzed the AQS principle and the realization. This is a sample of semaphore semaphore to see how Aqs is actually used.Semaphore represents a synchronizer that can have multiple threads entering a critical section at the same

https://m.oschina.net/blog/132361Implementation principleSay the principle of implementation, but also from the operating system IO model to understand According to the UNIX network programming, the IO model can be divided into: blocking IO,

Deep understanding of Java interfaces and abstract classesAbstract is one of the most important features of object-oriented programming. In Java, there are two ways to embody the abstraction of OOP: interfaces and abstract classes. There are too

A brief introduction to the anonymous inner class is made in the Java improvement-----, but there are many other details in the inner class, so this blog is derived. In this blog you can learn about the use of anonymous internal classes, what to

Examples of producer and consumer modes are used to explain the basic Java class methods such as wait, notify, notifyAll, and yypolicyall. Wait (), Policy (), and policyall () are Java-based java. lang. Object methods. General ExplanationWait ():

Set Exercises and exercises Use ArrayList 1. Store multiple employee information, including employee ID, name, age, and start time. Print all employee names one by one and output the number of employees. Package CollectionPart; import java. util.

Introduction to JavaSE 18: Java object-oriented PolymorphismJava Polymorphism Polymorphism is the ability of a single behavior to have multiple different forms or forms. Polymorphism is a manifestation of multiple forms of objects. For example, we

Review JSP learning notes -- JSTL tag library and learning notes -- jstl In the past, when I wrote jsp files, it was a little resistant to the jstl tag library, because I felt that the method of embedding java code was almost always unfavorable and

Spring Boot deployment and service configuration Spring Boot is integrated with web containers by default. It is started by the main function entry just like a common Java program. Its built-in Tomcat container or Jetty container is determined by