字典 可变字典 大杂烩

 

  //不可变字典    Student *s7=[[Student alloc]initWithName:@"jack"];        NSDictionary *dic=[[NSDictionary alloc]initWithObjectsAndKeys:s7,@"jack",@"26",@"age", nil];            NSString* str15=[dic objectForKey:@"age"];//objectForKey 获取对象        NSLog(@"%@",str15);        Student *s8=(Student *)[dic objectForKey:@"jack"];    [s8 showInfo];             NSArray *keys= [dic allKeys]; //获取 数组里面的 所有的KEY    NSLog(@"keys =%@",keys);    //    NSArray *values=[dic allValues];//    NSLog(@"%@“,va)//    allvalues;         //可变字典    Student *s9=[[Student alloc]initWithName:@"rose"];    NSMutableDictionary *mutableDic=[[NSMutableDictionary alloc]initWithCapacity:0];    [mutableDic setValue:s9 forKey:@"rose"];    [mutableDic setValue:@"26" forKey:@"lucy"];            [mutableDic removeObjectForKey:@"lucy"];//移除        Student *s10=(Student *)[mutableDic objectForKey:@"rose"];    [s10 showInfo];