根据第二个 map 中的键顺序对 Map 进行排序

Question

I've 2 LinkedHashMaps<String, SomeList>, say Map1 , Map2 The keys in both the maps are same but orders can be different.

Example:

Map1:

Hello, Value1
How, Value2
Are, Value3
You, Value4

Map2:

Hello, Value1
You, Value4
Are, Value3
How, Value2

I want to sort the Map2 by keys such that its order then becomes same as Map1.

Result I'm looking for:

Map2:

Hello, Value1
How, Value2
Are, Value3
You, Value4

Answer 1

Just create a new LinkedHashMap by iterating over the keys of map1 and obtaining for each key the corresponding value of map2 :

Map<String,String> sorted =
    map1.keySet()
        .stream()
        .collect(Collectors.toMap(Function.identity(),
                                  map2::get,
                                  (v1,v2)->v1,
                                  LinkedHashMap::new));