How to sort ArrayList<Object> in Ascending order android
Solution 1
Your approach was right. Make your Comparator
inner like in the following example (or you can create a new class instead):
ArrayList<Model> modelList = new ArrayList<>();
modelList.add(new Model("chandru"));
modelList.add(new Model("mani"));
modelList.add(new Model("vivek"));
modelList.add(new Model("david"));
Collections.sort(modelList, new Comparator<Model>() {
@Override
public int compare(Model lhs, Model rhs) {
return lhs.getName().compareTo(rhs.getName());
}
});
output:
chandru
david
mani
vivek
Solution 2
Collections.sort(actorsList, new Comparator<Actors>() {
@Override
public int compare(Actors lhs, Actors rhs) {
return lhs.getName().compareTo(rhs.getName());
}
});
Solution 3
Collections.sort(modelList, (lhs, rhs) -> lhs.getName().compareTo(rhs.getName()));
Chandru
I am an elegant and enthusiastic developer who always believes the myth of working smart rather working hard.
Updated on December 15, 2020Comments
-
Chandru over 3 years
I have a requirement to sort
ArrayList<Object>
(Custom objects) in Ascending order based upon name. For that purpose I am using comparator method as likeMy ArrayList :
ArrayList<Model> modelList = new ArrayList<Model>();
Code I am using:
Comparator<Model> comparator = new Comparator<Model>() { @Override public int compare(CarsModel lhs, CarsModel rhs) { String left = lhs.getName(); String right = rhs.getName(); return left.compareTo(right); } }; ArrayList<Model> sortedModel = Collections.sort(modelList,comparator); //While I try to fetch the sorted ArrayList, I am getting error message
I am completely stuck up and really dont know how to proceed further in order to get sorted list of
ArrayList<Object>
. Please help me with this. Any help and solutions would be helpful for me. I am posting my exact scenario for your reference. Thanks in advance.Example:
ArrayList<Model> modelList = new ArrayList<Model>(); modelList.add(new Model("chandru")); modelList.add(new Model("mani")); modelList.add(new Model("vivek")); modelList.add(new Model("david"));
Normal List:
for(Model mod : modelList){ Log.i("names", mod.getName()); }
Output :
chandru mani vivek david
My requirement after sorting to be like:
for(Model mod : modelList){ Log.i("names", mod.getName()); }
Output :
chandru david mani vivek