●プログラム・リスト●

※MyTestClass.hの内容

#import <Foundation/Foundation.h>

@interface MyTestClass : NSObject {
    NSString* message;
}

+(MyTestClass*)myTestClassWithMessage:(NSString*)str;
-(void)setMessage:(NSString*) str;
-(NSString*)message;
-(void)printMessage;

@end

@interface SuperMyTestClass : MyTestClass {
    NSString* message2;
}
+(SuperMyTestClass*)superMyTestClassWithMessage:(NSString*) str
                                    andMessage2:(NSString*) str2;
-(NSString*)message2;
-(void)setMessage2:(NSString*) str;

@end


※MyTestClass.mの内容

#import "MyTestClass.h"

@implementation MyTestClass

+(MyTestClass*)myTestClassWithMessage:(NSString*) str {
    MyTestClass* obj;
    @autoreleasepool {
        obj = [[self alloc] init];
    }
    [obj setMessage:str];
    return obj;
}

-(void)setMessage:(NSString*) str {
    message = str;
}

-(NSString*)message {
    return message;
}

-(void)printMessage {
    NSLog(@"%@",message);
}

@end

@implementation SuperMyTestClass

+(SuperMyTestClass*)superMyTestClassWithMessage:(NSString*) str
                               andMessage2:(NSString*) str2 {
    id obj = [super myTestClassWithMessage:str];
    [obj setMessage2:str2];
    return obj;
}

-(NSString*)message2 {
    return message2;
}

-(void)setMessage2:(NSString*) str {
    message2 = str;
}

-(void)printMessage {
    NSLog(@"%@. %@",message,message2);
}

@end


※main関数の内容

int main (int argc, const char * argv[]) {
    MyTestClass* obj = [MyTestClass
                        myTestClassWithMessage:@"This is First Object!!"];
    [obj printMessage];
    SuperMyTestClass* obj2 = [SuperMyTestClass
                              superMyTestClassWithMessage:@"This is Second Object!!"
                              andMessage2:@"It's SUPER!!!"];
    [obj2 printMessage];
    
    return 0;
}