java basic concepts pdf

+ ")"); }}When I put this problem to my yard friends to see, their first reaction is: Who TM write code, readability is too poor, requires refactoring.But when it comes to specific output, they're still a little skeptical.Yes, we are now a high-level route, for the basics of things, it is not necessarily grasp.The results are as follows:base1commonbase1last==============main================base1commonbase1lastsuber (1 )==============main=============base1commonbase1lastcommonbase1 (3-su) Suber

the schema must be specified.URLs Urns are 2 different types of URIs.Three. HTML XMLXML is one of the most common JSON and XML2 of the network transmission language.He has no grammatical rules such as XML is not an alternative to HTML, but rather a complement.HTML is used to transfer browser text.XML transmits network content, such as obtaining a student's list from a server.Four. MIME Media typeMIME is a widely accepted way of expressing multimedia types, especially in Linux systems.So this

for up to a specified waiting time was in this state.One thread waits for another thread to wake up within a time threshold, and the threshold is returned to the runnable state.Enter the Timed_waiting state using the following methods: Call Thread.Sleep () Call Object.wait () exceeds the time threshold value Call Thread.Join () exceeds the time threshold value Call Locksupport.parknanos (Object,long) Call Locksupport.parkuntil (Object,long) TERMINATEDA thread that

(i) Basic concepts of threads: (1) Processes and Threads: Process: Running applications are called processes, owning system resources (CPU, memory) Thread: A piece of code in a process that can have more than one piece of code in a process. does not own resources (shares the resources of the process in which it resides) (2) Distinguishing between processes and threads: 1. The question of whether or

basis of the less , that is, 8-1-i (i is the variable of the outer loop). Select Sort Method: The basic idea of choosing a loop, in fact, is a reverse process of bubble sort method, and the bubble sort method is to compare the value after the first round and put it in the last place. After the next round to do the comparison of the last value is not tube, and the choice of sorting method is every comparison round, the value of the found in the front,

distribution systems, which creates new security issues that Java can use to build antivirus and anti-attack system. It turns out that Java is doing a better job of anti-virus. (6) Neutral architecture: Java compilation its generation architecture-neutral target file format can be executed on many processors, and compiler-generated instruction bytecode (Javabyte

processing, processing completed return, in this process the client (browser) can not do other things.Async (Async)Asynchronous versus synchronous, when an asynchronous procedure call is issued, the caller can proceed with the subsequent operation until the result has been obtained. When this call is complete, the caller is generally notified by state, notification, and callback. For asynchronous calls, the return of the call is not controlled by the caller.For the three ways to notify callers,

current instanceor call another constructor Throw Throw exception Throws Defining exceptions that a method might throw Transient Modify fields that do not serialize Try Represents a code block to do exception handling or a finally mate to indicate whether throwing an exception executes the code in the finally void Tag method does not return any values Volatile Tag fields may be acce

SpringmvcThe core idea of web development: The model is separated from the view; The control logic is separated from the business logic; The view selection is separated from the specific view technology; Non-intrusive development (with minimal use of framework-specific APIs) and easy testing. What is SPRINGMVC: SPRINGMVC is a Web component of the spring framework, which is a lightweight web framework based on Java-implemented we

registers in the CPU.We consider a number of contiguous memory units as a segment, by moving a segment address to the left 4 bits to form the base address, and then through the base site to locate the beginning address of the segment, and finally through the offset address can be accurately positioned to the memory unit in the segment.Since the start address of a memory segment is a segment address left 4 bits, the starting address of the memory segment must be a multiple of 16. and the memory

first sentence we store in the AX Register (accumulator register) a 16bit number of 1234H, but the actual ax is composed of Ah, Al two registers, so you can directly manipulate Ah, AL these two 8-bit registers.If we want to deposit a number more than 16bit in a register, it is not possible under a 16-bit CPU. If you want to handle 16bit of the number, you can only use other registers, segmented processing.Get data from a 16bit memory addressFor example:MOV BX,1000HMOV DS, BX????;向DS段寄存器传入1000H

Basic features of Java　Java is a relatively simple language, and simplicity has become one of the reasons why Java is growing rapidly.Java is one of the few multithreaded languagesJava is an object-oriented programming languageJava provides an automated garbage collection mechanism (GC)