ios NSNumber NSArray NSDictionary 初始化简写

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions{   NSNumber *number = @4;   NSArray *array   = @[@3];   NSDictionary *dict = @{@"key":@3 , @"tsetKey":@"sww"};   //NSDecimalNumber   NSLog(@"NSNumber 简写测试---%@",number);   NSLog(@"NSArray  简写测试---%@",array);   NSLog(@"NSDictionary 简写测试---%@",dict);      //打印结果：   NSNumber 简写测试---4   NSArray  简写测试---(3)   NSDictionary 简写测试---{      key = 3;      tsetKey = sww;   }