zenfolio examples

inherited from the base class in the derived class object, which is the base class reference to the derived class. If a virtual function is defined in Class A, and the virtual function is overridden in class B, a polymorphic effect can be generated by ref.Iii. Summary of citations(1) In the use of reference, it is meaningless to simply give a certain variable name, the purpose of the reference is mainly used in the transfer of function parameters, to solve the problem of the transfer efficiency

The reason for the compile error of "unreachable code" is that Java checks that the statements behind them cannot be executed unlessBecause jumping to the next loop, or somewhere else, could not execute the next sentence because of a constant cycle of death. These errors are called compile-time errorsChecked exception: This type of exception is a subclass of exceptionUnchecked exception: This type of exception is a subclass of RuntimeException1. Throw keywordJava code:1 Public void throws throw

())); writer = new PrintWriter (Socket.getoutputstream ()); String question = Reader.readline ();//no content blocks while (!question.equals ("over")) { String answer = getanswer (question); Writer.println (answer); Question = Reader.readline (); } writer.println ("over");//over as Operation complete code writer.flush (); if (writer! = null) {wri

/MAPRED/SYSTEM-RW------- 1 hadoop supergroup 4 2014-12-15 18:47/usr/local/ Hadoop/tmp/mapred/system/jobtracker.infoThis time the/data permissions have changed, even the file under its folder has changed! But here I notice that this text file changes to 777 immediately but does not have permission to execute, do not know why. But it's rwx in Linux! Now let's use the command to see:Hadoop fs-chmod-r A+x/dataRe-use:Hadoop FS-LSR/The result is not shown here, but it still does not change

IFS is modified, the way $* separates the command line as a parameter will change. [Email protected]It is an ingenious variant of $*, which does not use IFS environment variables, so even if IFS is empty, the parameters will not be squeezed together. Shell Script Example#!/bin/shsalutation= "Hello" Echo $salutationset foo bar Bamecho "The program was now running" echo "the second parameter W As $ "echo" the first parameter was $ "echo" The parameter list was $* "echo" The user's home d

1 Public classorderservicebean{2 PrivateSetNewHashset();3 PrivatelistNewArraglist();4 PrivateProperties Properties =NewProperties ();5 PrivateMapNewHashmap();6 7...//getter and setter methods for omitting attributes8}Assemble the Set set (the list assembly method is similar):1 2 3 4 5 6 7 To assemble the Properties collection:1 2 3 4 5 6 7 To assemble a map collection:1 2 3 4 5 6

Example of a link to go lang and C + +:Foo.hppFoo.hpp#ifndef _foo_hpp_#define _foo_hpp_templateFoo.cppFoo.cpp#include "FOO.HPP" #include Foo_wrap.hFoo_wrap.h#ifndef _foo_wrap_h_#define _foo_wrap_h_#ifdef __cplusplusextern "C" {#endif//add function Familyint add_ Int_wrap (int lhs,int rhs); float add_float_wrap (float lhs,float rhs);//display some messagevoid display_wrap (); #ifdef __ Cplusplus} #endif #endif//_foo_wrap_h_Foo_wrap.cppFoo_wrap.cpp#include "Foo_wrap.h" #include "foo.hpp"//add func

following is a classic question about thread deadlock: "The question of dining philosophers" as the last example of this section. The question is this: five philosophers sit around a table, with a bowl of rice and a chopstick in front of each person. Here each philosopher can be regarded as a separate thread, and each chopstick can be regarded as a lock. Each philosopher can sit, think, and eat in one of three states. It is important to note that every philosopher eats two chopsticks, so the qu

, commonly known as message digest or digital fingerprint, can be directly applied to data integrity detection.MD2, MD4, andMD5 is cryptographic hash functions with a, bit output.1. MD5 (): Compute the MD5 messagedigest of the bThe following functions is used if the message isnot completely stored in memory:2. Md5_init (): initializes ab3. Md5_update (): Can be calledrepeatedly with chunks of the message to be hashed (b4. Md5_final ():p laces the message digest in BHere is the test code:Cryptote

= logging. Filehandler (logname) fh.setlevel (logging. DEBUG) 16 17 # Create another handler for output to the console ch = logging. Streamhandler () Ch.setlevel (logging. DEBUG) 20 21 # Defines the output format of the handler #formatter = logging. Formatter ('% (asctime) s-% (name) s-% (levelname) s-% (message) s ') Formatter = Format_dict[int (loglevel)]24 Fh.setformatter (Formatter) Ch.setformatter (formatter) 26 27 # Add logger self to handler28. Logger.addhandler (FH) Self.

Com.home.thread.thread10;import Java.util.date;public class Threadtask extends thread{public void run () {while ( True) {try {thread.sleep (2000); System.out.println (New Date (). toString () + "thread mode, I am two seconds to execute");//Here you can write the timer business you want to implement} catch (Interruptedexception e) { E.printstacktrace ();}}}Operation Result:Sat 01:33:34 CST 2015 thread Way, I was two seconds to execute a Sat Feb 01:33:36 CST 2015 thread Way, I was two seconds to

Algorithm (hash).To ensure the correctness of the hash, the object as a key can not be changed. In Python, strings, integers, and so on are immutable, so you can safely use them as keys. The list is mutable and cannot be a key:>>> key = [1, 2, 3]'a list'Traceback (most recent call last): " " in 'list'" "Dictionary: Contains " "my_dict= {'name':'Kumata',' Age': 20,' Location':'Zhuhai'}#Output Key valuePrint(my_dict['name']) #increase key pair valuemy_dict['Sex'] ='Mans'Print(my_dict)#to modi

1 fromTimeImportCTime2 ImportThreading3 4 defCoding (language):5 forIinchRange (5):6 Print('i\ ' m coding', language,' Program at', CTime ())7 8 defmusic ():9 forIinchRange (5):Ten Print('i\ ' m listening music at', CTime ()) One A if __name__=='__main__': - - Print('thread%s is running ...'%Threading.current_thread (). Name) the -Thread_list = [] -T1 = Threading. Thread (target=coding, args= ('Python',)) -T2 = Threading. Thread (target=music) + thread_list.appe

ShapeSheet.Activepage.shapes ("xxx"). RowCountActivepage.shapes ("xxx"). CellsSRCSublistcells ()'holds the current shape. DimTheshape asShape'Loop counter variables. DimRowCount as Integer DimCellcount as Integer 'holds the current cell information. DimThecell asCellDimCellname as String 'obtain a selected shape.' Shapename,refer before papers SetTheshape = Activepage.shapes ("XXX") 'Open The file that would contain the cell names.Open Thisdocument.path +"\ce

Shell1) is a scripting language used on the Linux operating system, providing interfaces for user interaction with the system, similar to the command prompt in Windows, but more powerful;2) can be executed by the command line, or it can be edited as a script file;3) mainly for automation simple system or software operation task;4) Easy to configure, maintain and transplant, do not fancy execution efficiency;5) The generic Shell is a bash (GNU Bourne-again Shell) in the GNU Toolset, which is inst

working directory to the root directory.4. Call Umask to set the file mode creation shield Word to 0. Because the process inherits the file creation mask from the parent process that created it. It may modify the access bit of the file created by the daemon. To prevent this, the file creation mask is cleared: Call Umask (0).5.close (); The process inherits the open file descriptor from the parent process. Without shutting down, system resources will be wasted, causing the file system where the

Sort by the second character of the 1th field, if the field is only 1 characters followed by a number, the order of the letters after the normal sort of 2 charactersRepeated lines in a uniq are repeated without repeating rows, such as:1122And the sort in-u to achieve uniqueness, that is, the meaning of removing duplicate rows:1122And1231Two kinds ofI thought for a long while to figure out, first sort of the neighboring are photographed together, and then use Uniq to show the number of adjacencya

library can be specified in three other ways in addition to the default search path, and this is only one of them: Specify the dynamic library search path through the environment variable Ld_library_path.When multiple dynamic-link library search paths are specified through the environment variable, the paths are separated by a colon ":". Use the following command to configure the environment mkdir/home/owner/test/lib//set this directory as the storage directory for the dynamic library mkdir/hom

Label:A table is connected to itself, called a self-connectedQuestion: A netizen put forward such a SQL topic, said oneself thought for a long time did not solve, I see, this is not very simpleBut in the Query Analyzer debugging for half a day the original problem is not that simpleThere is a student's table, there is a study numberStudent score three fields. Use a SQL query to get the top two results for each courseStudy number homework number student results1 1 992 1 983 1 1004 2 885 2 876 2 8

"//" operationThe division operator is "/", which is known to all, but the result of this two-dollar operator "/" is determined by the operand itself.20/3620/3.06.66666666666666720.0/36.66666666666666720.0/3.06.666666666666667When using the "/" operator, as long as an operand is a floating-point number, the result is a floating-point result, which we call the true divide, but if the two operands are integers, then the result is an integer number of decimal digits, which we call division. But if