core java syllabus

Multi-threaded Multi-core Java multi-threaded programming technology analysis-general Linux technology-Linux programming and kernel information, the following is a detailed description. I. multithreading technology in the Java environment Building a threaded application often has an important performance impact on the program. For example, consider a program tha

, field6. Process ControlThe basis of Java process control, although some grammars are not necessarily common, they need to be understood and used where appropriate.What you need to know is:Syntax for process control such as if, switch, loop, for, and while7. The concept of object-oriented programmingThis is a core concept of Java and requires proficiency for any

#背景提要It's been a long time since you deployed the code yourself, and the command line's intimacy is getting lower. Released the keyboard, accustomed to the mouse operation of the Windows environment. Sudden practical deployment is also good.Often at the time of deployment, OPS students are blind to [hs_err_pid] files. As everyone knows, this is the Java Virtual machine crash log.#这次是如何分析问题的? First, viewLog Header file## A fatal error has been detected

Click to enter _ more _java thousand ask1. What is the JDK base extension class library?See the Java core Framework here: What is the Java core framework?The JDK base Class library is divided into two parts, the base library, the extended base library, and provides a considerable amount of functionality, as follows:

Again the skin of the blog for Change, looking more concise comfortable some. The first part of the knowledge is only a little understand, take it can be used, but their own aesthetic and design level limited, it is difficult to make their own special satisfaction of things, but also a small regret it! Anyway, because recently involved in the Java core is a lot of things, I think it was just an application

Core Java (1), corejavaI. Xu 1. Software: a set of computer data and commands organized in a specific order. Software Development: using development tools and computer languages to make software 2. Computer Language: language used for communication between people and computers Machine language, assembly language, and advanced language Advanced languages are divided into compiled language and interpreted lan

reprinted from: Http://www.cnblogs.com/ydpvictor/archive/2012/09/03/2669472.htmlThe general direction of Java is JAVAEE,JAVAEE not only socket programming, including 13 core technology.Core APIs and components for Java EEThe Java EE platform consists of a suite of services, application interfaces (APIs), and protocols

, starting from the base class, subclasses, handling the initialization at the definition, the points to be aware of when performing the construction method: static properties, etc. properties related to the default parameterless construction method from the base class, subclass5. Access controlThis is also a basic feature of the Java package, you need to know: public protected default private for class, method, field of the modification of the role6.

The general direction of Java is JAVAEE,JAVAEE not just socket programming, including 13 core technologies.Core APIs and components for Java EEThe Java EE platform consists of a suite of services, application interfaces (APIs), and protocols that provide functional support for the development of Web-based multi-tier ap

Java Core Technology Volume One Java base type Integral type Data Type Number of bytes range of Values Int 4 +_2^4*8-1 Short 2 +_2^2*8-1 Long 8 +_2^8*8-1 Byte 1 -128-127

language Features, object-oriented (encapsulation, inheritance, polymorphism), reflection, generics ... (2) Java Class Library: Core class library, such as Io/nio, network, Utils ... ; Security libraries, JDK, management, and massive third-party class libraries (3) Java Virtual machines: garbage collector, Runtime, dynamic compilation, accessibility, such as JFR

-The cornerstone of JavaEE: 1. EJB (Enterprise JavaBeans ): A Java server component development Specification defines a standard method for developing object-oriented distributed application components based on which the software vendor implements the EJB server. Java programmers can combine some EJB components to build distributed applications conveniently and quickly. The EJB specification has also done a

process is a layer of constantly abstract process, then the most detailed products appear general.And in the study of the specifications of the Java EE did not understand, why should have j2ee13 a specification, in the specification of the Code play what role? Is it a first-class standard? We are able to compare it with. NET,. NET is Microsoft's strategic product, and the description of the Java EE describ

Software 151 Wang Qiang 1531610136The general direction of Java is JAVAEE,JAVAEE not only socket programming, including 13 core technology.Core APIs and components for Java EEThe Java EE platform consists of a suite of services, application interfaces (APIs), and protocols that provide functional support for the develo

The general direction of Java is JAVAEE,JAVAEE not just socket programming, including 13 core technologies.Core APIs and components for Java EEThe Java EE platform consists of a suite of services, application interfaces (APIs), and protocols that provide functional support for the development of Web-based multi-tier ap

asynchronously, then under what circumstances with the Execute or Submmit method? such as multi-threaded parallel execution, do not need to execute the results returned when the general use of the Execute method, if the need for multi-threading parallel computation, and all need to return the results of the time, need to Submmit method, of course, submmit generally blocking, If you want to retrieve the results at the time set, if you do not get the exception is to set the parameters through the

callable object, save the returned future object. When no more tasks are committed, call shutdown. Scheduled executionThe Scheduledexecutorservice interface has a method that is designed for scheduled execution or repetitive execution of tasks. The latter two methods implement this interface.Control task groupsThe InvokeAll method submits all objects to a collection of callable objects and returns a list of future objects that represent the solution for all tasks.Fork-join FrameSome ap

Classes are loaded:　　Refers to reading the binary data of a class file into the runtime data area (the JVM is partitioned in memory)and creates a class object within the method area.Class Loader:Responsible for loading the compiled class file (bytecode file) into the JVM (Java Virtual machine).The class loader is mainly divided into the following types:1.Bootstrap class loader (boot class loader)Responsible for loading the

0000,Which means 128 is 1000 0000 in the computer,The integer.tohexstring parameter is int, and if you do not 0xff, then when a byte is converted to int,Since int is 32 bits, and byte has only 8 bits, this will be the complement.For example, the decimal number of the complement 11111111 is 1 to int when converted to 11111111111111111111111111111111 many 1 ah, hehe!That is 0xFFFFFFFF but this number is wrong, and this complement will cause errors. and 0xFF and after the high 24 bits will be clea

Java Multithreading Core technology comb (with source code) Java Multithreading Core Technology comb the source code written in front Java multithreaded objects and variables concurrent access between threads communication lock usage Timer single case mode and multithreadi