本文介绍了一个使用Objective-C实现的矩形和正方形类。通过继承关系，正方形类从矩形类中继承了基本属性，并添加了自己的特性。文中展示了如何创建这些形状对象并计算它们的面积。
MyRectangle.h
//==========================================
#import <Foundation/Foundation.h>
@interface MyRectangel:NSObject{
int width;
int height;
}
-(MyRectangel*) initWithWidth:(int) weight andHeight:(int) height;
-(void) setWidth:(int) width;
-(void) setHeight:(int) height;
-(int)width;
-(int)height;
-(void) area;
@end
//===============================================
#import "MyRectangle.h"
-(MyRectangel*) initWithWidth:(int) weight andHeight:(int) height{
self = [supert init];
if(self){
[self setWidth:w];
[self setHeight:h];
}
}
-(void) setWidth:(int) w{
width = w;
}
-(void) setHeight:(int) h{
height = h;
}
-(int)width{
return width;
}
-(int)height{
return height;
}
-(void) area{
NSLog(@"%d",width*height);
}
@end
正方形
//正方形继承矩形=============================================== #import "MyRectangle.h" @interface MySquare:MyRectangle{ int size; } -(MySquare*) initWithSize:(int)size; -(void) setSize:(int) size; -(int)size; @end //=============================================== #import "MySquare.h" @implementation MySquare -(MySquare*) initWithSize:(int)s{ self = [super init]; if(self){ [self setWidth:s]; [self setHeight:s]; } //return self; } -(void) setSize:(int) s{ size = s; } -(int)size{ return size; } @endmain.m
//===============================================
@import "MySquare.h"
int main(argc,const char * argv[]){
MyRectangel *r = [[MyRectangle alloc] initWithWidth:2 andHeight:5];
[r area];
MySquare *s = [[MySquare alloc] initWithSize:6];
[s area];//调用父类的方法，计算面积
[r release];
[s release];
}
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