programmer dvorak

" @implementation person-(void) Setage: (int) age{ _age = age;} -(int) age{ return _age;} -(void) SetName: (NSString *) name{ _name = name;} -(NSString *) name{ return _name;} @end　　@public: The member variables of an object can be accessed directly from anywhere@private: can only be accessed directly in the object method of the current class ( @private is the default in the @implementation ) @protected: can be accessed directly in the object methods of the current class and its s

program, and you can use #undef to terminate its scopeThe macro definition uses a macro name to represent a string that, when expanded, replaces the macro name with the string, but simply replacesThe macro name is not expanded in the source program if it is enclosed in double quotation marks.L macro definition does not allocate memory, only character substitutionL macro definition can be nested#include #define PI 3.14#define R 3.0#define L 2*pi*r#define AR pi*r *rint main () { double len;

pointer to output all elements of array a , while the pointer PA points to the next cell of a[]Array names and arrays of pointer variables as function argumentsIn the fifth chapter, we have introduced the problem of using the arguments and parameters of the array famous function.It is easier to understand the problem after learning the pointer variable.The array name is the first address of the array, and the actual parameter to the parameter transfer array name is actually the address of the t

: it. Next () needs to be used two times, so give him a new object class)4. Return to the new container.List collection to add objects, note the custom Person () custom in the () class. equals () methodFour, Set.|--collection|--list: Elements are ordered and elements can be duplicated. Because it's orderly, the method with the horn is his special method.| ——— ArrayList: The underlying data structure uses an array structure. Features: Fast query speed, but insert and delete slow. Thread is out o

one-dimensional arrays contain 3 elements of type int2. StorageL Two-dimensional arrays are stored in rows, first the elements of the first row, and then the elements of the 2nd row. For example, the order in which int a[2][3] is stored is: a[0][0]→a[0][1]→a[0][2]→a[1][0]→a[1][1]→a[1][2]3. InitializationL Inta[3][4] = {1,2,3,4,5,6};L Inta[3][4] = {{},{},{}};L simple access to array elementsL Inta[][5] = {3,21,31,2,32,1};L NOTE the error:int a[3][4];A[3] = {};Four, string 1. What is a stringL Si

(Thread.CurrentThread ()+ "" +ticket--); } } }} classMlpcdemo { Public Static voidMain (string[] args) {MLPC M1=NewMLPC (); ///Third step, create a thread object by creating a subclass object of the thread class. mlpc m2=NewMLPC (); MLPC M3=NewMLPC (); MLPC M4=NewMLPC (); M1.start (); //Fourth step, call the Start method, open the thread, execute the Run method M1.start (); M1.start (); M1.start (); }}The Run method and the Start method Run method is just the object

-System.out.println (Math.random ());//0.43527904004403717 the + /** A * Rint rounded, return double value the * Note that an even number will be taken at 5. + */ -System.out.println (Math.rint (10.1));//10.0 $System.out.println (Math.rint (10.7));//11.0 $System.out.println (Math.rint (11.5));//12.0 -System.out.println (Math.rint (10.5));//10.0 -System.out.println (Math.rint (10.51));//11.0 theSystem.out.println (Math.rint (-10.5));//-10.0 -System.out.println (Math.rin

method has an exception, it must be done with a try and never be thrown.Summary of Knowledge points1. Inheriting classes and implementing interfacesThe parent class defines the common properties of a class of things, and the interface tends to define the extended functionality of a class of things.2. Use of Throw and throws1) The throw is defined within the function and is used to throw an exception object;2) throws defined on the function, used to throw the exception class, can be thrown multi

parent class functionsSubclass overrides the parent class function, must ensure that the child class permission is greater than or equal to the parent class permission, otherwise the compilation fails;Static can only be overridden by static.3. Final keyword FeaturesWhen an inner class is defined at a local location, it can only access the locally final decorated local variable and cannot access the externally final decorated variable.4, the subclass of the abstract class must rewrite all the ab

interface, and to make the reverse store, you only need to compare the O1 and O2 parameters in the code to redeem the location.2. Two sorting methods of elements in the TreeSet collection:1) defined inside the elementThe CompareTo method in the real comparable interface.2) Custom ComparatorImplement the Compare method in the comparator interface and pass the comparer object to the collection.Note: the "Custom comparer" takes precedence when both are present.3. When overriding the Equals method,

netcard ()); M.mainusepci (new Soundcard ());}} Object: is the direct latter indirect parent of all objects. What is defined in this class is definitely the functionality that all objects have. The object class already provides a comparison method for whether the objects are the same. If the custom class also has the same functionality, there is no need to redefine it. Just follow the functions in the parent class and build your own unique comparison, which is the overlay. Involving Knowledge p

has bonus.Analysis:1. There must be an employee class2. The manager belongs to the employee, but not exclusively, he has his own special attributes.3. Attributes required by the Employee class: Name/id/gongzi4. Manager attached properties: BonusClass Employee{private string name;private string id;private int gongzi;//Initialize Employee (string name, string id, int gongzi) {this.name = Name;this.id = Id;thi.gongzi = Gongzi;} Public abstract work ();//no method body}class Manage extends employe

of the collection, then the ToArray method automatically creates a data of that type, and the length is the size of the collection.If the length of the array that is passed the specified type is greater than the size of the collection, then the ToArray method does not create a new array, directly uses the array, and stores the elements in the collection in the array, and the other is the default value NULL for the location of the stored element.Therefore, the best way to pass an array of the sp

function of other files (error)The intrinsic function (static) in this file can be the same as the function name of other files.Effect on a variable:There are two categories of global variables:External variables: Defined variables can be accessed by other files1. By default, all global variables are external variables2. External variables of the same name in different files represent the same3. Define an external variable without extern and add extern to the declarationThe same statement is no

(LOCKB)}Synchronized (LOCKB){Synchronized (Locka)}Example 2:sychronized void Show (){Method ();}sychronized void Method (){Show ();}The lazy type in singleton mode, that is, lazy loading, when there is multi-threaded access, there will be a thread security problem. The workaround is to add synchronous code blocks or synchronous functions.However, after joining the synchronization, the efficiency of the program is reduced, as each thread enters the synchronization section and the synchronization

memory space. The process is often seen as a synonym for a program or application, however, a separate application that the user sees may actually be a set of mutually collaborative processes. To facilitate communication between processes, most operating systems support interprocess communication (IPC), such as pipes and sockets. IPC not only supports communication on the same system, but also supports different systems. NBSP; Most implementations of the Java Virtual machine are single-pro

1. The array name is a pointer constant representing the first address of the array space, and the constant assignment is not allowed in the program.such as int a[]; A is the array name, which represents the pointer constant of the first address of the array controlA = 0; is wrong and does not allow assigning values to pointer constants2. You can point to a constant by the pointer, but you cannot modify the contents of the constant through the pointersuch as: Char *p;p = "Testing"*p = ' 0 ';3.So

——-Android Training, Java training, look forward to communicating with you! ———-Sorts the characters in a string in a natural order.For example, "Vcz1bdaa+cs" –>abccdsvzIdeas:1 turning a string into a character array2 sorting an array3 Locate the first occurrence of ' a ' in the character array4 calculating the number of characters to convert5 character arrays into stringsImport Java.util.Arrays; class stringsortdemo { Public Static voidMain (string[] args) {String str1 ="Vcz1bdaa+cs";

= "CVHELLOBNM";System. out.println( getmaxsubstring(str1,str2)); }//Match maximum same substring public staticStringGetmaxsubstring(string str1,string str2){//Compare two string lengths, long as STR, short as keyStringstr =(str1. Length()>str2.length())? STR1:STR2;StringKey =(str= =str1)? str2:str1; For(int i = 0; I key. length (); i++) {for(int J = 0,k = key. ) Length()-I.; K!=key.length()+1;j++,k++)//j is the head pointer of key, K is the tail pointer of key {//set a temporary variable to s

-oriented programming language, the Java language implements the object-oriented theory, which allows programmers to do complex programming in an elegant way. We climbed 110,000 Java People's information for a portrait analysis.Java main focus Areas:North Canton and deep to 80-step speed leader. Chengdu, Hangzhou, Wuhan, Nanjing, Xi ' an have a rapid development momentum. The rest of the little cutie, the next day who will come home? Let's wait and see.working experience mainly focus on the