fastest way to learn java

methods.　　② down transformation and runtime type recognitionAs the upward transformation loses the specific type information, we think that by going down the transformation should be able to get type information, in the Java language, all transformations will be checked. If the type does not match, a classcastexceptionis returned. This behavior of checking the type during run is called Runtime type recognition (RTTI).5. Summary Polymorphism means "di

From HTTP://WWW.IMPORTNEW.COM/26932.HTML1. Brother Bird's Linux private cuisine-Basic study Article 3. Effective JAVA6. The art of Java concurrent Programming 7. In-depth analysis of Java Web Technology Insider 8. Deep understanding of Java Virtual Machine 9. The core principle and case analysis of large web site technology architecturePersonal evaluation: If you

Believe that your answer is to believe that your program to run the results. For different problems in different information may have different answers, like a pony across the river, different people may have different answers, so do not blindly believe anyone, to believe in themselves. 1, more hands Learning programming languages is not only a theoretical study, but also the use of this language to serve your thoughts. It is important to understand this language, but to reach the point of unde

Follow the examples to learn java multithreading 6-how to correctly publish thread-safe objects, java6- Everything we mentioned above is only for the purpose of correctly releasing a thread-safe object. I. Closed threads This is easy to understand. If a variable changes its status in a thread, the variable must be thread-safe. We often use stack closures and ThreadLocal classes. There is a virtual machine s

1, more hands Learning programming languages is not only a theoretical study, but also the use of this language to serve your thoughts. It is important to understand this language, but to reach the point of understanding, mastery must be done, more time, more examples. Computer science is a practice-oriented discipline, successful software developers are all through a lot of physical training, only the combination of theory and practice can really master only and skills. 2. Multi-Brain For th

Nine, interfaceInterfaces and internal classes provide us with a more structured approach to separating interfaces from implementations.1. Abstract classes and abstract methodsAbstract classes are a kind of moderation between common classes and interfaces. Creating an abstract class is what you want to manipulate a series of classes through this generic interface. Java provides a mechanism called an abstract method , which is incomplete, with only de

overridden to implement the main function of this thread, This is also the way to implement the Runnable interface. Second, a class should be inherited when they need to be strengthened or modified. Therefore, if it is not necessary to rewrite other methods of the thread class, it is best to implement the Runnable interface in this case. three, in the disconnection processThe thread terminates when the thread's run () method executes the last statem

Java has been learning for some time, and found that it is only to understand Java, but also outside the threshold.Sometimes it really feels like this is not an alien language, various methods of various kinds of excuses, always silly confused. Learned the knowledge after one weeks began to blur, sometimes sleep at midnight when still thinking, feel that they are almost schizophrenic, full brain in the chil

Generics are a new feature of Java SE 1.5, and the nature of generics is a parameterized type, meaning that the data type being manipulated is specified as a parameter. This type of parameter can be used in the creation of classes, interfaces, and methods, called generic classes, generic interfaces, and generic methods, respectively. the benefits of introducing generics into the Java language are simple and

Generics are a new feature of Java SE 1.5, and the nature of generics is a parameterized type, meaning that the data type being manipulated is specified as a parameter. This type of parameter can be used in the creation of classes, interfaces, and methods, called generic classes, generic interfaces, and generic methods, respectively. the benefits of introducing generics into the Java language are simple and

I saw this post in the Forum and spent half an hour writing a reply. I don't know which key I came across. I refreshed the interface. I don't think it's a pity, it is representative, so I will rewrite it here. There are still many similar questions. For example, is school learning useful? Why are there no frameworks or other courses in the school? Is Software Engineering useful? To answer this question, we must first consider what the school is doing? If the school's goal is to cultivate a

The purpose of this blog: ① summary of their own learning process, equivalent to study notes ② to share their own experience to everyone, learn from each other, communication, not commercialcontent inevitably appear problems, welcome to correct, exchange, discussion, you can leave a message, can also be contacted by the following ways. I Internet technology enthusiasts, Internet technology enthusiastsWeibo: Ivan is in 0221qq:951226918-----------------

;//dog is the target object with thread declaration speakpigpig;// pig is the target object Dog=newspeakdog (); //creates the target object Pig=newspeakpig (); // Create target object Speakdog=newthread (dog); //Create thread Its target object is Dogspeakpig=newthread (pig); //Create thread Its target object is Pigspeakdog.start (); //start thread Speakpig.start (); //start thread for (inti=1;i Threads can share the same memory units (including code and data) and use these shared units for d

Java.4: Save the object's reference to a lock-protected domain.Package Com.uskytec.ubc.foundation.queue;import java.util.hashmap;/** Route Cache * @author Gaoxu * */public class Routecache {private static Routecache instance = null;public synchronized static Routecache getinstance () {if (instance = = NULL) instance = new Routecache (); return instance;} Private final static hashmapWith these release strategies in hand, we can better write thread-saf

Take a few minutes to learn about final in Java . 1, the so-called final refers to the final modified properties, classes, methods can not be changed. 2,final the class, which means that the class cannot be inherited, For example, if Class B is final decorated, final class b{}, so Class A cannot inherit B. 3,final modifier, which means that the method cannot be overridden, 4,final modifies a variable to ind

of an anonymous class, and dynamically creating an instance of the anonymous class. The benefits of this writing are obvious, using interfaces to contract, and then actually using the business code when it is used. This makes the code much leaner, without the need to create a bunch of Java code units.However, if the class needs to be named and reused, it is less appropriate to use this approach, or there will be a lot of duplicated code. When looking

common classes of implementations that are possible: the Arrarylist class and the vector class Arrarylist class are introduced in JDK1.2, using asynchronous processing, high performance, and non-thread-safe. Vector class is introduced in JDK1.0, the use of synchronous processing, low performance, belonging to the thread-safe.(2) Set interface:Can not repeat the content, but can be sorted, break into the order of its two commonly used subclasses: HashSet class and TreeSet class HashSet class is

variables, use one of the following filter functions: Filter_var ()-Filters a single variable by a specified filter Filter_var_array ()-Filters multiple variables by the same or different filters Filter_input-Gets a Input variable and filter it Filter_input_array-get multiple input variables and filter them by the same or different filters.There are two types of filters:Validating Filter: Used to validate user input Strict formatting rules (e.g. URL or e-mail authentication) Re

, we put a test.properties file into our class directory, we use the ClassLoader to read the contents of it.The content of our configuration file is simple:User=rootpassword=123456The code is as follows:The operating result is:User:rootpassword:123456PostscriptThis article introduces the basics of reflection and the source of reflection . Class class, and tells about getting Class class object in four ways, but also introduced the class loader some knowledge, about reflection this article first

1.About Java coercion Type conversionsint x = 1;Byte y = 2;byte z = 0;1). z = (byte) (x+y);//forced type conversion succeeded2). z = (byte) x+y;//forced type conversion error, loss accuracyThe second way to convert X to byte is to give an error.Resolution: Byte short int is an int after each other, including Byte+byte,short+short, if the three and long types are mutually counted as long typesView the