-How to learn java

(How to learn Java ?) Maple Leaf country tour 12:37:58
I can give you a rough explanation based on my own experience, hoping to help you and avoid detours.
Learning Java should actually rise to the realm of How to Learn program design. In fact, learning program design also accepts a programming idea. The program design concepts of each language are similar, but they are just some minor differences brought about by the language characteristics. For example, interfaces in Java, you have hardly encountered them in your previous studies. I will give you a few points:
1. We must clarify a general direction, that is, the current object-oriented programming scope. Although artificial intelligence has a wave (to see why Borland has Turbo Prolog), in the next 5-10 years, the industry will widely recognize and accept object-oriented programming.
2. Currently, the most popular object-oriented programming languages in the industry are C ++ and Java. So we can basically lock these two directions. And can be mastered at the same time.
3. Master the essential features of Java and be sure to know why. For example, Interface and multi-thread. Using interfaces is a better model of multi-inheritance, while multithreading is an important feature designed at the language level. We need to fully understand why the interface is, and there are several common programming models with multithreading.
4. After understanding the characteristics of a language, you can try to rise to the design level. After all, you need to learn the language. Currently, a better development mode is a custom object-oriented design, coupled with the MVC pattern (you can take a look at the content I introduced about MVC ). First, we need to find the objects at the top level (which is often the most difficult), and then layer-by-layer recursion. Remember that each time we meet the principle of 7 +/-2, because our short memory is like this. Generally, the graphic user interface should be designed from the interface.
5. With the basic Design model, you can learn some Design patterns ). This is currently proven to be effective. For example, the architecture mode (Layering layer, Pipe/Filter pipeline or Filter), the design mode (there are many, such as the Object Pool of the Object Pool, buffer Pool Cache, etc ), programming mode (such as Copy-on-Write ). After understanding these models, we will have a good grasp of the overall structure of the system, and there is also a tendency for an academic system to be composed of various models. The MT mentioned above actually has several modes, so you don't have to spend a lot of time trying it on your own. Another very important field is the parallel and distributed computing field, with about 20 types.
6. Next we can't talk about it on paper. The best method is practice. In general, examples in textbooks cannot be regarded as Practices. They can only be used to help you master the language features. It is not very good to advocate the practical Project, because you have not yet mastered the ability to integrate various technologies, so that you are more and more confused. I think a better way is to find some classic examples. Each example is designed by comparing a programming idea in a set. For example, in my practice, I have learned a classic example of HotDraw implemented in Java (derived from SmallTalk). You can use rolemodel or hotdraw to find it on the search engine. I cannot remember it clearly. It seems that rolemodel.com is a website with the original code and some basic design documents. Another source can go to www.umlchina.com, which is a good document base. From HotDraw, I learned what Framework is and how to construct it using rolemodel, so that I can apply it to other places. By the way, you will never think of this example as small, but as big as a commercial Framework.