Objective-c oop (bottom)-class (static) method, instance method, overwrite (overwrite), property)

First define a human parent class

Definition:

 
/// Human. h // OOP // created by Jimmy. yang on 11-2-9. // copy 2011 _ mycompanyname __. all rights reserved. // # import <Foundation/Foundation. h> @ interface human: nsobject {bool sex;} + (void) tostring;-(void) showsex; @ end
 

Note: +The plus sign before (void) indicates that this is a class method (static method), and-(Void) indicates that this is an instance method

Implementation:

Note: The following-(ID)InitIt is a constructor. Corresponding, there is also a-(void)DeallocThe method is used to release resources (similar to the Destructor or the dispose () method in C #)-Note: The dealloc method will be learned in detail in memory management.

/// Human. M // OOP // created by Jimmy. yang on 11-2-9. // copy 2011 _ mycompanyname __. all rights reserved. // # import "human. H "@ implementation human // constructor-(ID) Init {nslog (@" Init () in human is called "); Sex = true; Return (Self );} // static class method + (void) tostring {nslog (@ "this is a Class Method of Human");} // instance method-(void) showsex {nslog (@ "my sex is % @", sex? @ "Male": @ "female");} @ end
 

Define a woman subclass.

Definition:

 
/// Woman. h // OOP // created by Jimmy. yang on 11-2-9. // copy 2011 _ mycompanyname __. all rights reserved. // # import <Foundation/Foundation. h> # import "human. H "@ interface woman: Human {bool married;}-(void) cancook :( nsstring *) foodname;-(void) setmarried :( bool) m;-(bool) married; @ end
 

Implementation:

NoteThe setmarried and married are standard attributes in obj-C (of course, other simplified attributes can be viewed later)

/// Woman. M // OOP // created by Jimmy. yang on 11-2-9. // copy 2011 _ mycompanyname __. all rights reserved. // # import "woman. H "@ implementation Woman // woman class constructor-(ID) Init {nslog (@" Init () in woman is called! "); If (Self = [Super init]) {sex = false; married = false;} return (Self) ;}// overwrite tostring () in the parent class () + (void) tostring {nslog (@ "this is woman's tostring ()");} // woman can cook-(void) cancook :( nsstring *) foodname {nslog (@ "I can cook % @", foodname);} // setter-(void) setmarried :( bool) m {married = m;} of the attribute ;} // getter-(bool) married {return married;} @ end of the property
 

Call in the main method:

# Import <Foundation/Foundation. h> # import "human. H "# import" woman. H "int main (INT argc, const char * argv []) {ngutoreleasepool * Pool = [[ngutoreleasepool alloc] init]; // insert code here... nslog (@ "Hello, world! "); // Call the" static "method of the class [Human tostring]; nslog (@"----------------"); // create a human instance Human * Man = [Human new]; // call man's showsex method [Man showsex]; nslog (@"----------------"); // define a woman subclass instance woman * wife = [Woman new]; [wife cancook: @ "rice"]; // call the method [wife showsex] inherited from the parent class; // set the attribute [wife setmarried: True]; // read the nslog (@ "Wife's married = % @", wife. married = no? @ "False": @ "true"); nslog (@ "----------------"); // call the tostring method after overwrite [Woman tostring]; // common methods in the factory mode, which are still applicable here (except that 'human 'may not respond to'-cancook: 'will be warned during compilation :') human * wife2 = [Woman new]; [wife2 cancook: @ "Soap"]; nslog (@ "----------------"); [pool drain]; return 0 ;}
 

Running result:

17:01:02. 016 OOP [1725: a0f] Hello, world!
17:01:02. 053 OOP [1725: a0f] This is a class Method of Human
17:01:02. 062 OOP [1725: a0f] ----------------
17:01:02. 075 OOP [1725: a0f] Init () in human is called
17:01:02. 091 OOP [1725: a0f] My sex is male
17:01:02. 094 OOP [1725: a0f] ----------------
17:01:02. 099 OOP [1725: a0f] Init () in woman is called!
17:01:02. 104 OOP [1725: a0f] Init () in human is called
17:01:02. 105 OOP [1725: a0f] I can cook rice
17:01:02. 108 OOP [1725: a0f] My sex is female
17:01:02. 109 OOP [1725: a0f] Wife's married = true
17:01:02. 111 OOP [1725: a0f] ----------------
17:01:02. 116 OOP [1725: a0f] This is woman's tostring ()
17:01:02. 120 OOP [1725: a0f] Init () in woman is called!
17:01:02. 121 OOP [1725: a0f] Init () in human is called
17:01:02. 123 OOP [1725: a0f] I can cook soap
17:01:02. 125 OOP [1725: a0f] ----------------