1 // 2 //  main.m 3 //  L02HelloObjC 4 // 5 //  Created by JinXin on 15/11/25. 6 //  Copyright © 2015年 JinXin. All rights reserved. 7 // 8  9 #import 
     
      10 #import "AppDelegate.h"11 12 // 类的声名部分13 @interface Hello : NSObject{14     int num;15 }16 -(void)sayHello;17 @end18 19 // 类的实现部分20 @implementation Hello21 -(instancetype)init{22     self = [super init]; // 初始化父类23     if (self) {24         num = 100;25     }26     return self;27 }28 29 -(void)sayHello{30     NSLog(@"hello oc class");31     NSLog(@"num is %d",num);32 }33 @end34 35 int main(int argc, char * argv[]) {36 37     Hello *h = [[Hello alloc]init];  // 创建类对象38     [h sayHello]; // 调用类方法39     40         @autoreleasepool {41         42         return UIApplicationMain(argc, argv, nil, NSStringFromClass([AppDelegate class]));43     }44 }