//? ? ? ? 數(shù)組（NSArray/NSMutableArray)

//? ? ? ? 不可變數(shù)組

NSArray *array1 = @[@"a",@"b",@"c",@"d"];

//創(chuàng)建

NSLog(@"array1 = %@",array1);

//? ? ? ? 數(shù)組元素個數(shù).count

NSLog(@"count = %ld",array1.count);

//? ? ? ? 通過下標訪問數(shù)組里面的元素

NSString *str = array1[0];

NSLog(@"str = %@",str);

//? ? ? ? 可變數(shù)組NSMutableArray

NSMutableArray *mutableArray = [NSMutableArray arrayWithObjects:@"1",@"2",@"3",@"4", nil];

NSLog(@"mutableArray = %@",mutableArray);

//? ? ? ? 元素個數(shù)：count

NSLog(@"count = %ld",mutableArray.count);

//? ? ? ? 添加個數(shù)

[mutableArray addObject:@"5"];

NSLog(@"已添加----%@",mutableArray);

//? ? ? ? 移除元素

[mutableArray removeObject:@"3"];

NSLog(@"已移除----%@",mutableArray);

//? ? ? 字典(存放多個鍵值對(key-value)的一種數(shù)據(jù)類型）

//? ? ? ? (NSDictionary,NAMutableDictionary)

//? ? ? ? 不可變字典NSDictionary

NSDictionary *dict = @{@"key1":@"value1",@"key2":@"value2",@"key3":@"value3"};

NSLog(@"dict = %@",dict);

NSString *string = [dict objectForKey:@"key1"];

NSLog(@"string = %@",string);

//? ? ? ? 所有的key值，所有的value值

NSLog(@"allkeys = %@,@allvalues = %@",dict.allKeys,dict.allValues);

}

return 0;

}