Method of Collections class for sorting List elements

Question

I have a List which contains multiple Map elements like this: List<Map<String,String>> List. Each Map has only 4 key corresponding to their values like this: Map<Supplier, A>, Map<Color, Red>, Map<Priority, 10>, Map<Price, 38>. How do I sort my List by Price in java.

Answer 1

Maybe these can help you
https://beginnersbook.com/2013/12/how-to-sort-hashmap-in-java-by-keys-and-values/
http://www.java67.com/2014/04/2-ways-to-sort-hashmap-in-java-example.html?m=1

Answer 2

I've solved my problem. Remember that Map may encounter nullPointerException, so we should make sure Map is not null.