thinkful review

A thread is a different path in a programExample 1Only one pathEach branch is a threadIn fact, a computer can run only one process at a time, but because the CPU is running fast, we feel like we're working at the same time.Two ways to create a threadExample 1:Example 2:Inherit from threadUse interfaces as much as possibleThread State SwitchingBasic methods of threading controlSleep/join/yield methodTest 1Test 2Merge to a Main methodPriority of threads (not all)ExampleExampleHow to stop rightCurr

usage of the byte stream and the character stream is the same, the difference is that the byte stream and the character stream operate the different data units--byte stream operation is 8 bits of bytes, character streamThe operation is a 16-bit character. Byte stream mainly consists of InputStream and OutputStream as base class, while character stream is mainly composed of reader and writer as base class.node stream and process flow: a node stream to read and write data from a specific data sou

{/** * @paramuse of sleep, join, yield*/ Public Static voidMain (string[] args) {Runnable run=NewMyrun (); Thread Th1=NewThread (run); Myth Th2=Newmyth (); for(inti=0; i){ if(i!=25) {System.out.println ("Main Thread"); }Else{Th1.yield ();//Let the CPU out}} th1.start (); Th2.start (); Try{th1.join ();//Thread MergeTh1.sleep (1000*3);//Sleep 3 seconds}Catch(interruptedexception e) {e.printstacktrace (); } }}classMyrunImplementsrunnable{ Public voidrun () { for(inti=

* Thread_routine (void*Arg) {Pthread_detach (pthread_self ()); intconn = (int) Arg; Echo_sev (conn); printf ("exiting thread ... \ n"); return 0;}intMainintargcConst Char*argv[]) { intListen = socket (pf_inet, Sock_stream,0); if(Socket 0) Err_exit ("Socket"); structsockaddr_in servraddr; Servaddr.sin_family=af_inet; Servaddr.sin_port= Htons (5188); Servaddr.sin_addr.s_addr=htonl (Inaddr_any); intOn =1; //set up port multiplexing if(Setsocketopt (LISTENFD, Sol_socket, SO_REUSEADDR, on

1, identifiers are divided into three categories: keywords, predefined identifiers, user identifiers. Keywords have a special effect in C, so you can't use them like int, print, and so on. A predefined identifier is a pre-defined identifier that has a special meaning and cannot be used as a include,define, for example. A user identifier is a user-defined identifier that has the same naming rules and keywords, consisting of letters, numbers, and underscores, but the first word must be a letter or

7th Chapter7.13-1 Harmonic Average7.13-1 excise.cpp Harmonic Average#include Double Calculate (double a,double b);using namespace Std;Main (){Double x, y, Z;coutcin>>x>>y;while (x!=0y!=0){Z=calculate (x, y);coutcoutcin>>x>>y;}coutreturn 0;}Double Calculate (double a,double b){Double Z;z=2.0*a*b/(A+B);return z;}C + + Primer 6 Exercises (non-review questions)

release the memory. The thing to do with the delete is to call the destructor, then release the memory, and note that the delete frees the memory space instead of the destructor release. For class-type objects on the stack, the destructor is called automatically when the scope is exited, and then the memory is freed.Summary: For a class type object on a stack, like a built-in type variable, the system automatically frees the memory after the scope is exited. In fact, the difference between a bu

-parametric construction method Super(); } Public Usernotfoundexception (String msg) { // There is a constructor method Super(msg) ;custom exceptions are used in two ways: Violation of business logic: Public void F1 ()throws usernotfoundexception{ if(condition not satisfied) { Throw usernotfoundexception (' condition not satisfied '); }}Try--catch () Capture output: Public void F2 () { try{ // business code }catch(Exception e) { Throw New Usernotfounde

1.Formatted output:　　printf ("%-m.nf", a);where all of the formats are formatted as%-m.nf-: Stands for left alignment, default has right alignmentM: Represents the number of placeholders,N: Representing precision2.The form of the function definition　　int Add (x, y) int x, y; { int z; Z=x+y; return Z;}A different formint Add (int x,int y) { int z; Z=x+y; return Z;}3.Macro definition#define a BWhen the program compiles a simple character substitution, all calls t

----generate XML documents from XmlSerializerParsing xml: Document start, element start, text element, end of element, end of documentGenerate XML: Generate document declaration (document start), element start, text content, end of element, end of document1. Generate Simple XML2. Generating XML from Object data3. Generating XML from the object list dataTwo methods are extracted in the program-----1. The XML---list Object 2. The list object generates XMLCurd operations on the in-memory listHomewo

represented by the enumeration value can be cast, or the numeric value of an integer is converted to the enumeration value it represents.4. You can manually assign each enumeration member a value of the integer type it represents.5. Convert the string to the enumeration value Direction D = (Direction) enum.parse (typeof (Direction), str);6. The value of the enumeration corresponds to a value of type int by default, you can specify the type of the numeric value by appending a colon to the name o

First, the layout labelParagraph break: Horizontal:Second, block labelDifference: two consecutive div line breaks, two contiguous spans do not wrap, DIV+CSS, and span is often used for hints.Third, the text labelIv. List LabelFive, the picture label src as PathVi.. Link labelVii. Table LabelsEight, form labelsFormat:-----------------------------------Action: Form AddressMethod: How to submit: Get post put delete.The difference between get and post: When a get commits, the data is appended to the

members of an external class, but can be accessed through the new external class (). Members2. If the static member of the outer class is the same as the member name of the inner class, the static member of the external class can be accessed through the class name. static member; If the static member of the outer class is not the same as the member name of the inner class, the static member of the outer class can be called directly through the member name3. When you create an object of a static

the current position below invalid, above valid" =12. Definition of function : code snippet to complete a functionThe meaning of the function:>1>2>313. Naming conventions for functions :The code defined first is the function, followed by the method name, if the definition name is a named method (not automatically executed), no name is anonymousMethod (automatic execution on load), function name semantics, cannot use special characters, can use hump and underscore, function name repetition will

notify () Wait (XXX) when the corresponding notify () is called or exceeds the specified time, the thread will go into the ready state Wait () will only enter the ready state if the corresponding notify () is called Suspend () and resume ()Suspend () causes the thread to enter a blocking state and is not automatically restored. Only when the corresponding resume () is invoked will it enter the ready state Yield ()Causes the thread to discard the currently acquire

]"); Sf.sendordermail (order);}}I got the mail.Mass, with accessories for testingPackage Com.javacrazyer.service.test;import Java.util.arraylist;import Java.util.list;import org.junit.Test;import Org.springframework.context.applicationcontext;import Org.springframework.context.support.classpathxmlapplicationcontext;import Com.javacrazyer.comon.EmailService; Import Com.javacrazyer.comon.order;public class Userservicetest {@Testpublic void Test () throws Interruptedexception { ApplicationContext c

operator:P rintf ("Odd \ n");Bitwise operation AAMP;1?PRINTF ("Odd!\n"):p rintf ("even \ n");Writing a binary output function H.char character occupies 3 bytes, cannot use char I. Array special declaration, definition method int ages[5] = {[2] = 4, [4] = 1};int count = 5;int Ages[count]; Error: int D[count] = {1,2,3,4,5}; The array size must use a constant array as a function parameter when the array length array is omitted as a function parameter is a pointer passed as an array of parameters w

; Conditional Operations > Assignment Operations v. Assignment operator compound assignment operator + =-+ *=/= vi. self-increment self-reduction a++ ++aa--a PS: No squared: a** a//Seven, sizeof output accounted for the number of bytes eight, the relational operation except 0 is true the return value is only 0 and 1, true is 1, false is 0 There are multiple operators, you can use the results 1 and 0 continue in order of precedence operation nine, logical operation The results of the logical oper

directory of the Java Runtime Environment JRE, containing the Java virtual machine, the runtime's class package, theJava Application Launcher, and a bin directory, It does not include development tools in the development environment. ? Lib directory:Lib is the abbreviation for the library, meaning the Java class library or library file, which is the archive package file used by the development tool. ? Src.zip file:src.zip is a compressed file of src folder,the source code of the JDK core class

because the definitions of object.getname and (Object.getname) are the same. The third line of code executes an assignment statement before calling the result after the assignment. Because the value of this assignment expression is the function itself, the value of this cannot be maintained and the result returns "Windows".Of course, you are unlikely to call this method like the second and third lines of code. However, this example helps to illustrate that even minor changes in syntax can inadv