1.自定义的构造方法
Student.m文件：
@interface Student : NSObject
{
int _age;
int _no;
}
... …(getter/setter)
//自己写一个构造方法
-(id)initWithAge:(int)age AndNo:(int)no;
@end
Student.h文件：
#import "Student.h"
@implementation Student
... …(getter/setter)
-(id)initWithAge:(int)age AndNo:(int)no
{
//首先调用super的构造方法,然后判断self是否为nil
if (self = [super init])
{
self.age = age;
self.no = no;
}
return self;
}
main.m文件：
#import <Foundation/Foundation.h>
#import "Student.h"
int main(int argc, const char * argv[])
{
@autoreleasepool {
Student *student = [[Student alloc]initWithAge:15 AndNo:2];
NSLog(@"age is %i and no is %i",student.age,student.no);
[student release];
}
return 0;
}
2.重写父类的description方法
description方法：当使用%@打印一个对象的时候，会调用这个方法
在student.m文件中，重写description方法：
-(NSString *)description
{
NSString *str = [NSString stringWithFormat:@"age is %i and no %i",_age,_no];
return str;
}
在main.m的main函数中测试：
Student *student = [[Student alloc]initWithAge:15 AndNo:2];
NSLog(@"%@",student);
[student release];
输出：
2013-07-19 00:02:19.410 构造方法[2446:303] age is 15 and no is 2 |
|
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