learn java in 21 days pdf

become a web designer of the vast number of readers.21 days Website Construction record catalog: 1th Day to understand the development of the site 2nd day site positioning and pre-planning 3rd day application domain name and determine the site name 4th Day website collection and collation of the page of the 5th day website design and layout 6th day planning and production site logo and banner7th day use Dr

Theory is feasible, when you just start to learn C + +, to the 21st day to go out to be careful, haha.After reading you know, learning is no shortcut, 21 days you can master the basic grammar, but how to use, optimize the need to spend 10 years or more time, the Ancients said: "Book Mountain has no royal road for the path, the knowledge of the long bitter boat";I

when it throws a stray pointer, causing unpredictable consequences.So the delete is used to set the pointer to 0 (a null pointer).That is: Cat *pcat =new cat;Delete Pcat;pcat=0;. Delete is used after the pointer to set it to 0 (null pointer)14. Use the const pointer: when declaring a pointer, you can use the keyword const before or after the type, or you can use it in both places:const int *pone;int *const ptwo;const int* Const Pthree;①pone is a pointer that only wants to reshape a variable, an

21 days to learn javascript: Cookie Encoding This article is excerpted from "21 days learning JavaScript" Cookies are stored in the cookie file in an unencoded format. However, cookies do not contain special characters such as spaces, semicolons, and commas. If you want to w

Skb_video.setmax (M.getduration ());//Set Seekbar length M.setaudiostreamtype (audiomanager.stream_music); M.setdisplay (Surfaceholder);/set screen try {m.prepare (); catch (IllegalArgumentException e) {//TODO auto-generated catch block E.printstacktrace (); catch (IllegalStateException e) {//TODO auto-generated catch block E.printstacktrace (); catch (IOException e) {//TODO auto-generated catch block E.printstacktrace (); } m.start (); }}/* * SeekBar Progre

;4 intFibonacci (intposition);5 intMain ()6 {7 intposition;8cout"Please input the position:";9Cin>>position;Tencout"The Fibonacci number in position""is :"Endl; OneSystem"PAUSE"); A return 0; - } - the intFibonacci (intposition) - { - intminustwo=1, minusone=1, answer=2; - if(position3) + { -Answer=1; + } A if(position==3) at { -Answer=1; - } - for(;p osition>3;p osition--) - { -minustwo=Minusone; inMinusone=answer; -Answer=minusone+Minustwo; to

The exception information is captured through Try,catch and can be passed through a catch (Exception) (IndexOutOfRangeException), and finally will be executed after the catch is usedThe IO namespace includes routines for sending and receiving (input and output) informationChecked Unchecked: detecting Maximum and minimum valuesKeyword Is,as. is: Used to determine whether a variable is a specified type (expression is type) and expression is a reference type, and type is a valid type. Can be in th

The previous article briefly introduced the basic use of Surfaceview, this time on the introduction of Surfaceview and multithreading mix. Surfaceview is a multi-threaded application that is designed to prevent animation from flashing. The multithreading usage of Android is exactly the same as that of Java, this article does not introduce multithreading. Directly to explain the mixed use of Surfaceview and multithreading, that is, open a thread to rea

These two days in the study of Java Call printer print PDF file method, learned a lot of things, especially to record.On the Java print Web The most and also Java-Orthodox printing method is to use Printservice, a set of standard printed code such as the following:public cla

These two days in the study of Java Call printer print PDF file method, learned a lot of things, especially to record.On the Java Print Network The most and also Java-Orthodox printing method is to use Printservice, a set of more standard printing code is as follows:public c

page static, memcached cache technology, MySQL database depth optimization and so on.The above five stages are only PHP beginner to intermediate level, far from the advanced level (acting as a web architect) and still a long way to go.And not just learn a PHP can do everything, PHP is not omnipotent, all kinds of programming languages have its advantages and disadvantages, the language itself is not the difference between the high and low, language i

program on the command line (Classpath, Java. Library Path, the home directory where Java is running, etc.) 3. Data typeThis is nothing more than the basic type of Java and the mastery of object types. You can learn more about how the JDK automatically transforms knowledge, including packing and unpacking, and also to

. Reference the same address. Classes in Java must conform to the JavaBean rule. What is the JavaBean rule? Must have an argument-free constructor field cannot be public The fields of the class must be accessed using the get and set methods. Subclass calls the parent class method using the keyword: super In the next lesson, we will use the above to develop a small program with the source code. Let's experience ho