Objective-C NSDictionary和NSMutaleDictionary用法

这两个类类似于Java中的map,可以为Object定义一个key,通过key来查询对应的Object

#import 

int main (int argc, const char * argv[])
{
    
    @autoreleasepool {
        NSDictionary *dic1=[NSDictionary dictionaryWithObjectsAndKeys:@"Object1",@"key1",@"Object2",@"key2",nil];
        for(NSString *key in dic1)
        {
            NSLog(@"key=%@,Object=%@",key,[dic1 objectForKey:key]);
        }
         
        NSMutableDictionary *dic2=[NSMutableDictionary dictionary];
        [dic2 setObject:@"object3" forKey:@"key3"];
        [dic2 setObject:@"object4" forKey:@"key4"];
        //可以自行增加object
        
        for(NSString *key in dic2)
        {
            NSLog(@"key=%@,Object=%@",key,[dic2 objectForKey:key]);
        }
        
        
    }
    return 0;
    
}