pll fundamentals

1. Create a byte output stream object and do a few things:(1) Call system function to create file(2) Create Fos object(3) Point the Fos object to this file2. code example:1 PackageCom.himi.fileoutputstream;2 3 ImportJava.io.File;4 Importjava.io.FileNotFoundException;5 ImportJava.io.FileOutputStream;6 Importjava.io.IOException;7 8 /*9 * Create file Fos.txt, write string: Hello WorldTen * One * Operation flow of the output of the byte stream: A * A: Create byte output stream object - * B: Write

>100 | | score) {6 Throw NewMyException ("your input score cannot be greater than 100 or less than 0");//Here the MyException is inherited from exception is the compile-time exception, must be handled, here on the throw 7}Else {8System.out.println ("The score you entered is not a problem");9 }Ten } One A}(3) in compiling a test class, test the logic run, as follows:1 Packagecom.himi.myexception;2 3 ImportJava.util.Scanner;4 5 Public classStudentdemo {6 7 Public St

servlet only with Tomcat.(6) Apache is the most beginning page parsing service, Tomcat is developed after, in essence, the function of Tomcat can completely replace Apache, but Apache is the predecessor of Tomcat, and there are many people in the market still using Apache, So Apache will continue to exist, will not be replaced,Apache can not parse Java things, but parsing HTML fast .4. Examples of both:Apache is a car, which can be loaded with things such as HTML, but not water, to fill the wat

(b); 4 console.readline ();Optional topicsusingSystem;usingSystem.Collections.Generic;usingSystem.Linq;usingSystem.Text;namespaceExercises 3{classProgram {Static voidMain (string[] args) {Console.Write ("How many years have your mother been a stranger? "); stringA=Console.ReadLine (); Console.Write ("How old are you this year? "); stringb=Console.ReadLine (); intc = .; intD=int. Parse (a); intE=int. Parse (b); intF=c-d-e; Console.Write ("When you were born, your mother"+f+

enter your height:"); stringD =Console.ReadLine (); Console.Write ("Please enter your weight:"); stringE =Console.ReadLine (); Console.WriteLine ("--------------------Gorgeous split-line-----------------------"); Console.WriteLine (A+"Hi there! Your gender is ""+ B +"", your age is""+c+"", your height is""+d+""and your weight is""+e+"". "); Console.ReadLine (); } }}usingSystem;usingSystem.Collections.Generic;usingSystem.Linq;usingSystem.Text;namespaceExercises 2{classProgram {Static v

dual role in judging types and conversions.Try catch. Exception EX exception is also an object. Exception Class Main properties: Message, StackTrace. After an exception occurs, the program exits by default, and subsequent code in the try code block is not executed. The code after the catch will continue to execute. Throw out your own exception, throw: Throw, catch: catch.CONST constant. The constant name should be capitalized. Values that do not change must be declared as constants. A method th

1 intProgressrate =0;2 3 Private Async voidBtnprogress_click (Objectsender, EventArgs e)4 {5Progressrate =0;6 7 varProgress =Newprogressint>();8 9 //progress changes in progressTenProgress. ProgressChanged + = (obj1, obj2) = One { A if(Progressrate -) - { - This. lblprogress.content = progressrate.tostring () +"%"; the This. Pbprogress.value =progressrate; - } - Else -

Right-clickShow:To manage the device:In the computer properties, open the remote connectionControl Panel:Operation Center under the control Panel:Management tools under Control Panel:The default program under Control Panel:Date and time under control Panel:Mouse under the Control Panel:Sensors under the Control Panel:Desktop gadgets under the control Panel:Updates under Control Panel:Programs and features under the Control Panel:Recovery under control Panel:Getting started under the control Pane

"-prov"MyProvider":: Export aspnet_regiis-px"MyKeys" "D:/mykeys.xml"-pri:: Delete key container Aspnet_regiis-pz"MyKeys" Pause @echo ONCD C:\Windows\Microsoft.NET\Framework\v2. 0.50727 :: delete old key container aspnet_regiis -pz " mykeys " : Import new key container aspnet_regiis -pi " mykeys " " d:/mykeys.xml " :: Set access permissions for an application pool aspnet_regiis -pa " mykeys " " Span style= "COLOR: #800000" >iis apppool\myweb "- fullpause After writing these 2

CollectionCan be seen as an arrayCreate an array of length 10Array length is 10, to insert new data, you have to re-create the array sortFixed length, not too flexibleUse collections to easily solve these problemsYou can see the set as "variable-length, array with many methods"usingSystem;usingSystem.Collections.Generic;usingSystem.Linq;usingSystem.Text;usingSystem.Threading.Tasks;usingSystem.Collections;namespacethe various methods of _07arraylist {classProgram {Static voidMain (string[] args)

If you are already proficient in writing a project in one language, how can you learn another language quickly?First of all, learning materials are necessary. It is best to have a tutorial video, and a reference manual for this language (CHM version) is the best.The process of learning should be reasonable to plan their own time. The study cycle, the day's study time, the rest time and so on, anyway has own time concept .When you are familiar with the grammar of the language, then you need to fo

, so how will not change.2, the reference type, passes the address, if this address has changed, then the original value must be unchanged.3, the reference type, passes the address, if the address does not change, and changes the address corresponding to the object's properties, so long will change the original value.If you do not understand, then simply, as long as the incoming object in the method to re-assign a new object, then the original is not become.As in the method string, re-assigned a

interface The serialization of objects is primarily used to: The transmission of the data in the network is the byte stream, and the transmission of the object in the network is the conversion of the object's data into a byte stream. Serializes the object data into a file, converting the object data into a byte stream to be stored in a file. Converting an object to a byte stream is called the serialization of an object, and converting a byte stream to an object is called d

the current thread with the thread, waiting for the thread to terminateYield (): thread concession, yielding CPUWait (): The thread waits for the current thread to go into the wait pool thread. Discard lock WaitNotify ()/notifyall (): Wake on thread , wake up one/all threads in the waiting pool4. Thread synchronization　　Object mutex: Synchronized (obj) guarantees that only one thread at a time can access the object, guaranteeing the operational integrity of the shared data.Synchronization is ge

-up processBIOS (Basic Input Output System): A set of program small operating systems that are cured to a ROM chip on the motherboard of a computer, the main function is to provide the most direct hardware settings and control for the computer. Operating system startup process: Power on, run the BIOS, System self-test, read the CMOS parameters, start the corresponding device-read sector content, read-in bootloader boot loader module, start the operating system, check the driver for each device 1

cache the picture from the local search ； Loadimagewithurl: After receiving the LOADIMAGEWITHURL message, Sdwebimagemanager a singleton sends a QUERYCACHEOPERATIONFORKEY message to the Sdimagecache object to start searching for the cached picture locally, The Sdimagecache object first sends a IMAGEFROMMEMORYCACHEFORKEY message to itself, searches the image cache from memory, and then extracts the image and returns it through the Sdcachequerycompletedblock callback. Otherwise you send Diskimag

Parameter listLinux Command line specification Short parameter: Starts with a single cross, followed by a single character, for example: ls-h Long parameter: begins with a double-cross, followed by a string, for example: LS--help Program Access parameter list method: Parameters argc and argv of the main function The program accepts the input parameters of the command line and interprets the Writing programs, outputting command-line arguments#include using name

Finalize () method of the object.The general format of the Finalize () method is as follows:protected void Finalize (){Finalization code here}Where the keyword protected is to prevent code that is defined outside the class from accessing the Finalize () identifier. The identifier and other identifiers are explained in chapter 7th.It is important to understand that finalize () is called just before garbage collection. For example, Finalize () is not called when an object is outside its scope. Th

you understand these 2 points, the above output will be at a glance:1 true 2 false 3 true 4 true 5 true 6 false 7 trueView CodeThe first and second outputs have no doubt. The third sentence because a+b contains arithmetic operations, it triggers the automatic unboxing process (which calls the Intvalue method), so they compare the values for equality. And for C.equals (A+B) will trigger the automatic unpacking process, and then trigger the automatic boxing process, that is a+b, will call the Int

enter at any time. For example, a chess is in progress, allowing only one player to Lazi on the board at any given time, which is basically consistent with the concept of thread synchronization.(2). NET MutexThe mutex class is a type of mutex that is encapsulated in. NET, similar to a mutex and semaphore (semaphore). The following sample code shows the use of the Mutext typeClass Program {const string testfile = "C:\\testmutex.txt"; Simulating multiple users, executing the above code, is the r