排序2d对象数组Java

Question

I have an object array with customers. Every customer has max number of wishes. I have:

Customer[] customer  = new Customer[numOfCustomers]
C_wishes [][] w = new C_wishes[numOfCustomers] [maxWishes]

I sorted the out the customers with bubble sort but I can't do it the same with 2d array. Basically i would like to do something like this

[[obj7,o8, o9],[o1,o2,o3],[o4,o5,o6]] => [[obj1,o2, o3],[o4,o5,o6],[o7,o8,o9]]

but at some point the wishes don't align with customers. I'll post the code as soon as I can.

Answer 1

Id use a HashMap. Maps and Lists usually have sorting functions built in.

You need to know how to use 1.8 Lambdas tho

Answer 2

（如果你不想使用HashMaps）只需创建一个临时2d数组，根据子数组中的第一个值对每个子数组（意思是排序所有temp[i] ）进行排序（意思是基于temp[i][0] ）。