Collection of Java video tutorials

The easy introduction video of Java programming is sincerely produced by Qianfeng Education. This set of videos covers the basic knowledge of Java. Including: Java environment construction; Variable constants, data types and operators; Circular branch statement; Array; Functions and methods; object-oriented; String usage; Set; IO stream operation; Core knowledge such as interface programming. This video is simple in profound terms. It abandons obscure professional words and is deeply considerate of "Zero Foundation Xiaobai". Through learning, students with zero foundation can easily master the basics of Java programming.

The Java collection framework mainly explains: 1. Concept of set 2. Collection system collection 3. List interface and implementation class 4. Set interface and implementation class 5. Map interface and implementation class 6. Generic collections and tool classes

Java multithreading mainly explains: 1. What is thread 2. Thread composition 3. Thread status 4. Thread safety 5. Thread pool 6. Thread safe collection

New features of Java-JDK8 mainly explain: 1. Overview of Java 8 2. Lambda expression 3. Functional interface 4. Method Reference 5.Stream API 6. New Time API

The whole set of courses is jointly created by Mr. V, Mr. Mask, Mr. Qiang and Mr. Sol. The goal is to offer a luxurious dinner for Java beginners. The whole set of courses has 23 chapters in total. Through one set of courses, you can get a basic introduction to Java and establish profound basic skills. The first stage includes the first appointment of Java in Chapter 1, the basics of Java programming in Chapter 2, the selection structure in Chapter 3, the loop structure in Chapter 4, and the methods and arrays in Chapter 5. These are necessary contents for Java Xiaobai to establish programming foundation and train logical thinking. The second stage mainly includes: the most core knowledge about facial objects in Java foundation, including the three features of object-oriented, encapsulation, inheritance, polymorphism. At the same time, while explaining facial object knowledge, we will also explain many design patterns, such as factory pattern, singleton pattern, observer pattern, policy pattern, etc... In addition to these, we will also explain the common class library APIs, including wrapper classes, tool classes, and so on, as well as the collection related knowledge. The third stage includes paradigm, abnormal IO stream multi-threaded network programming, etc. This part is a key point for us to lay a good foundation for java. First, we will talk about what this knowledge is, what its role is, and where we will use it. At the same time, we will use easy to understand and interesting cases to make each technical point easier to understand. The fourth stage includes reflection, regular expression, enumeration, annotation, new Java features, JVM, concurrent programming and a system project. This part of the course includes not only the development of necessary tools, but also advanced technologies with considerable depth. Moreover, these knowledge also lay a solid foundation for future framework learning.

A method is a member of an object of a Java class, which is level with an attribute. Because both are members of a class. A method is a code encapsulation that "packages" the business functions we need to execute into this interval, and then uses classes or objects to call them to help us process data.

Object Oriented is a new programming method, or a new programming specification. Its basic idea is to use the basic concepts of object, class, inheritance, encapsulation, polymorphism, etc. to program. The software system is constructed from the objective things (i.e. objects) in the real world, and the natural thinking mode of human beings is used as far as possible in the system construction.

What is an exception? When a program is running, an unexpected event occurs that prevents the program from executing normally as expected by the programmer, which is called an exception. When an exception occurs, the program is allowed to survive and die, and immediately exits and terminates. In Java, that is, the error that occurs during the compilation or running of Java. Java provides a better solution: exception handling mechanism.

One of the characteristics of an experienced Java developer is to be good at using existing wheels to build cars. Joshua Bloch, the author of Effective Java, once said, "It is recommended to use existing APIs for development, rather than building wheels repeatedly.". In this article, we will share some of the most useful and necessary libraries and APIs that Java developers should be familiar with.

The collection framework is a unified architecture used to represent and manipulate collections. The Java collection framework mainly includes two types of containers. One is Collection, which stores a collection of elements, and the other is Map, which stores key/value pair mapping. The Collection interface has three sub types: List, Set and Queue, followed by some abstract classes, and finally concrete implementation classes. The commonly used ones are ArrayList, LinkedList, HashSet, LinkedHashSet, HashMap, LinkedHashMap, and so on.

File I/O: File I/O is called unbuffered I/O. Without cache, every read and write calls a system call in the kernel. In other words, the so-called low-level I/O is the basic I/O service provided by the operating system. It is bound to the OS and is specific to the Linix or Unix platform.

Java is one of the first languages to support multithreading development. Java has supported multithreading from the beginning, so Java developers can often encounter the problem scenarios described above.

Computer network is a system that interconnects computer equipment scattered in different places through transmission media, communication facilities and network communication protocols to realize resource sharing and data transmission. Network programming is to write programs to transmit data between two (or more) devices (such as computers) on the Internet. Java language provides good support for network programming. Through its interface, we can easily carry out network programming.

1、 What is introspection? Introspector is the Java language's processing method for JavaBean class properties and events. For example, if the class User has the property name, then there must be getName and setName methods, through which we can obtain or set values. This is a normal operation. Java provides a set of APIs to access the getter/setter method of a property. These APIs are stored in java. beans 2、 What is reflection? The Java reflection mechanism is to obtain all the properties and methods of any class during operation; Any method of any object can be called; This function of dynamically obtaining class information and dynamically calling class object methods is called the reflection mechanism of the Java language

Generics play an important role in java and are widely used in object-oriented programming and various design patterns. Generic, or "parameterized type". When it comes to parameters, the most familiar thing is that there are formal parameters when defining a method, and then the actual parameters are passed when calling this method.

Through this set of videos, children can fully master the core technology of Java language, lay a solid foundation for the follow-up Java high-level framework, distributed, and high concurrency courses, and reach the basic level required by P7 programmers (Ali technology experts) on basic algorithms and data structures, common design pattern principles, and OO ideas.