core java syllabus

Recommendation of Java multi-thread programming Core Technology I wrote this blog to recommend a book "Java multi-thread programming core technology" to yuanyou. It is recommended mainly because it is easy to understand and runs through the entire book as an example, so that the original abstract concepts are not abs

platforms include:WindowsLinuxMacThe file is also very small, which can be decompressed directly at around kb. Supported features include:JD-core and JD-GUI are written in C ++, which is the precondition for the decompilation speed.JD-core does not need JRE.The decompilable version of JD-core is as follows:Jdk1.1.8Jdk1.3.1Jdk1.4.2Jdk1.5.0Jdk1.6.0Jikes-1.22Harmon

The error details are as follows:: [6/27/13 15: 54: 49: 679 CST] 00000043 systemout o error-An error occurred while obtaining the instance of the specified object [appendixmgr! Check the configuration file! -Com. TRS. dreamfactory. createobjectbyid (dreamfactory. java: 79) Org. springframework. beans. factory. beancreationexception: Error creating bean with name 'appendixmgr 'defined in file [/opt/IBM/WebSphere/appserver/profiles/invalid rv06/installe

is to ensure the uniqueness of the class name.Import of Class 7.1A class can use all the classes in the owning package, as well as the public classes in other packages.You can only import a package using an asterisk (*), and you cannot import all packages prefixed with Java using Import java.* or import java.*.*.It is possible to add a specific package name to r

1. Description:[How to make JS and Java securely call each other in WebView] (http://www.pedant.cn/2014/07/04/webview-js-java-interface-research/) "Core JS full parsing2. Core JS parsing is as follows, welcome to shoot Bricks!!!javascript: (function (Win) {console.log ("hostappinitialization Begin "); //win. Hostapp Ob

-daemon threads end, the program ends, the JVM ends, because the thread that needs to be guarded is gone, the daemon thread is not working, so the program ends and the program "Kill" the daemon thread. In layman's terms, the program will not end as long as a non-daemon thread exists in the program.In the Java language, the daemon thread generally has a lower priority, it is not provided only by the JVM, and the user sets the daemon itself when writing

)Analysis: When a class is loaded, from the parent class to the subclass, from top to bottom, execute the static code block, and then execute the main function , if there is a statement of the new object, The construction code block and constructor of the binding are executed. Note: static code blocks have and execute only once14. What is the result of the following code?public class a{public static void Main (string[] args) {String str;System.out.println ("" + str);}}Analysis: The above code w

block first, and the post constructor)Parse: When a class is loaded and finished, from the parent class to the child class. From top to bottom. Run the static code block first, then run the main function , and if there is a statement for the new object, run the bound construction code block and constructor. Note: static code blocks are available and run only once14. What is the execution result of the following code?public class a{public static void Main (string[] args) {String str;System.out.

I recently concluded that I have not improved my skills. I am ready to start training. Write down this and give myself a goal. The core APIs of Java are very large, which makes it very convenient for developers. Many people often comment that java makes programmers stupid.However, I think some content must be mastered. Otherwise, it will be difficult to use

time.Look directly at an example:public class program{static void Main (string[] args) { UI layer = new UI (); Layer. Setdataaccessor (New Xmldataaccessor ()); Layer. Do (); }} class ui{dataaccessor m_accessor; public void Setdataaccessor (Dataaccessor accessor) {m_accessor = accessor;} public void does () { m_accessor. GetUser (); }} interface dataaccessor{void GetUser (); void RegisterUser ();} class xmldataaccessor:dataaccessor{public void GetUser () {} public void RegisterUser () {}}Th

class does not have a way to modify the strings, if you really want to change them The following expressions are legal The = = operator detects whether two strings are placed in the same position In fact, only string constants are shared, and the results of operations such as + or substring are not shared Issupplementarycodepoint (int codepoint) is a Boolean method of the character class that determines whether the specified character (Unicode code point) i

The ArrayList of the Core Java thing.　　High-rise ground, Java Foundation to pick up. Today, I looked at the core Java from the basic point to find a little bit to share.First of all, the professional-level Lucky Star actor---employee Class (PS: I am focused on Lucky Star 30)

At present, multi-core CPU is the mainstream. The multi-core technology can effectively leverage hardware capabilities and improve throughput. For Java programs, concurrent garbage collection can be implemented. However, Java uses multi-core technology to bring about some pr

First, to talk about final, finally, finalize the difference.Final modifier (keyword) If a class is declared final, it means that it can no longer derive a new subclass and cannot be inherited as a parent class. Therefore, a class cannot be declared abstract and declared final. Declaring variables or methods as final ensures that they are not changed in use. A variable declared as final must be given an initial value at the time of declaration, and can only be read in subsequent references and c

Core Java- concept Chapter If you need to know which Unicode characters belong to the Java alphabet, you can use the Javaidentifierstart and Javaidentifierpart methods of the Charactor class to detect Const is a reserved word for Java, but it is not currently used An integer that is 0 apart will produce an exception

have different implementationsMethod definitions in Java--------------------------1) A method allows the presence of multiple modifiers, with no order of precedence between multiple modifiers2) The return type is located after the modifier, and a method must have a return typeFor methods that do not return a value, the return type is void3) When there is a return value in the method, each branch in the method is required to have a return to ensure th

MODULE 1Compilation and operation of Java----------------------------Compilation: Javac-d bin Src\helloworld.java-D: Specify the storage path for the compiled class fileIf you call the class of another file in the class of this. java file, you need to compile the called class first, and then enterjavac-d Bin-cp bin Src\helloworld.javaor compile all. java files ja

Java NiO Tutorial (i) Core Overview Java NIO consists of the following core components: Channels buffers Selectors Although there are many other classes and components in Java NIO, it seems to me that Channel,buffer and Selector constitute the

loaded by the sub-classloader cannot be converted to each other. It should be emphasized that all variables after the overloaded class is reinitialized, so some important data variables must be managed by the parent classloader. This method has some disadvantages. The core logic is combined to separate the variables, which affects the structure of the application. At present, this method should be used in a message service, mainly to avoid restarting

change methodThis is obviously more complex than providing a simple public data field, but it also has significant advantages(1) Can change the internal implementation, in addition to the method of the class, does not affect the other code(2) The Change method can perform error checking, but assigning a value directly to a domain will not be processedNote Do not write accessor methods that return references to mutable objects.3.4 Class-based access rights(1) A method can access the private data