Java Quick Start: from these six skills, java Quick Start

Java Quick Start: from these six skills, java Quick Start

1. Master static methods and attributes
Static methods and attributes are used to describe the features of a certain type of object group, rather than the features of a single object. Static methods and attributes are widely used in Java. This is a common technique. However, this technique is not frequently used in many languages. Understanding static methods and attributes is very helpful for understanding the relationship between classes and objects. in a large number of Java specifications, static methods and attributes are frequently used. Therefore, learners should understand static methods and attributes. Java is consistent in the call of methods and properties. The difference is only manifested in the declaration, which is different from c ++.

2. Pay attention to interfaces
Class inheritance is widely used in early object-oriented applications. With the continuous development of software engineering theory, people began to realize the many shortcomings of inheritance and began to try to replace inheritance with aggregation. An important principle for Software Engineering to solve scalability is abstract description. interfaces are directly used as tools. Interfaces have gradually become the core of Java programming methods in recent years. On the other hand, as far as applications are concerned, most development is based on specifications, and you do not need to build complex inheritance relationships and huge classes on your own. Therefore, reading and using the specifications has become the primary task for application developers. interfaces are the main methods to describe Java specifications.

3. Learning the collection framework
Java describes complex data structures in a collection framework. Java does not have pointers, but uses a powerful Collection framework to describe complex data structures such as arrays and object arrays. The description of these data structures is crucial for application programming, especially for server-side and layer-3 structured programming. Programmers cannot describe data with structures such as database result sets at this time.
Because many languages do not have such a powerful Collection framework system, many beginners are overwhelmed and do not know what to use. Therefore, they should be paid enough attention.

Iv. Exception capture
Java emphasizes exception capture in an unprecedented manner. It forces programmers to describe exception capture in a way that is significantly different from a logical method, which has great significance for the completeness and rigor of program description. C ++ has similar mechanisms, but we can see that many c ++ programmers are not used to these mechanisms.
Java Beginners should fully learn this exception capture mechanism and develop good programming habits.

5. multi-thread mechanism to be understood
Many Java programmers are keen on multi-threaded programming and think it is a challenge to the logic capability. In fact, in a large number of applications, there is no need to write multi-threaded programs, or most programmers who write applications will not write multi-threaded programs. This is because the multithreading mechanism is built into the basic platform.
Programmers should understand the principles of multithreading and the security of multithreading, which is crucial for the future to accurately grasp the program.
For example, the security impact of writing JSP code to different locations on multiple user environments is completely different. For example, the Super Servlet with the name is an access process, but each page is a thread, in contrast to Servlet, the impact on program performance and security is quite different.

6. Understand Network Programming
Java is known as the strongest network programming language, but most application developers never develop any underlying network programs themselves.
You only need to understand the principle. The implementation of the network mechanism depends on the platform. Unless you develop the platform yourself, you do not need to know how to implement the socket and how to listen for access. Therefore, if you spend too much effort in this regard, you will deviate from the assumption that "application development in the future will be carried out on a mature platform, rather than from the underlying development platform.

Learn JAVA quickly, starting with the above six programming skills.

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