Custom Sorts in Java 8

Question

I have a list of maps as shown below. I want to sort maps inside a list in custom order in Java 8.

For example, Below is a list of maps.

[{model=Ferrari},
{model=Tesla},
{model=Benz},
{model=Honda}]

If I sort the list of cards above using the code below, it is sorted in alphabetical order.

l.sort(Comparator.comparing((Map<String,String> mp) -> mp.get("model")));

gives the result below.

[{model = Benz}, {model = Ferrari}, {model = Honda}, {model = Tesla}]

But I need to sort this card based on the order (not in alphabetical order): Honda, Tesla, Benz, Ferrari

Is there a better approach to achieving custom sorting in Java 8?

Answer 1

- . - , Map of modelName → index.

Map<String,Integer> modelOrder = .....

.

l.sort(Comparator.comparing((Map<String,String> mp) ->
    modelOrder.get(mp.get("model"))));

, - . -

l.sort(Comparator.comparing((Map<String,String> mp) -> 
    modelOrder.getOrDefault(mp.get("model"),Integer.MAX_VALUE)));

, ( ).

Edit:

, , .thenComparing

l.sort(Comparator
    .comparing((Map<String,String> mp) -> modelOrder.getOrDefault(mp.get("model"),Integer.MAX_VALUE))
    .thenComparing((Map<String,String> mp) -> mp.get("model")));