[OC Foundation框架

 

void dicUse()
{
    NSMutableDictionary *dic = [NSMutableDictionary dictionary];
    Student *stu1 = [Student studentWithName:@"Simon"];
   
    NSLog(@"stu1:%zi", [stu1 retainCount]);
    [dic setObject:stu1 forKey:@"k1"];
    NSLog(@"stu1:%zi", [stu1 retainCount]);
   
    [dic setObject:[Student studentWithName:@"Joke"] forKey:@"k2"];
    NSLog(@"%@", dic);
   
    [dic removeObjectForKey:@"k1"];
    NSLog(@"after remove stu1:%zi", [stu1 retainCount]);
   
    NSMutableDictionary *dic2 = [NSMutableDictionary dictionary];
    [dic2 addEntriesFromDictionary:dic];
    NSLog(@"dic2: %@", dic2);
}

 

NSMutableDictionary不允许使用简化的集中初始化方法创建

error:

        NSMutableDictionary *d11_1 = @{@"姓名":@"张三", @"年龄":@"21", @"性别":@"男"};