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Chapter 7. Working with Object-Oriented ... > Overloading Base-Class Methods
Overloading Base-Class Methods
You can also overload methods. When you overload a method, you give it multiple definitions, and Objective-C chooses the correct version of the method based on the parameter list—the type and number of parameters must be different for each version of an overloaded method.
Listing 7.9. Starting overload.m.
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Code View:
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Show All #import <stdio.h>
#include <Foundation/Foundation.h>
@interface Class1: NSObject
-(void) print;
@end
@implementation Class1
-(void) print
{
printf("Hello there.\n");
}
@end
@interface Class2: Class1
-(void) print: (int) x;
@end
@implementation Class2
-(void) print: (int) x
{
printf("Your number is %i.\n", x);
}
@end
int main(void)
{
Class2 *c2 = [Class2 new];
[c2 print];
[c2 print: 5];
return 0;
}
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