CODEWITHSUNDEEP
javaandroidsortingarraylist
bob
bob

Reputation: 155

ArrayList sorting using Comparator for object

I have Model class which contains 

int rs;
String name;

I want to get rs > 8

ArrayList contains all data 

  Collections.sort(arreyList, new Comparator< Model >() {

        public int compare(Model one, Model other) {

    int a = one.getrs();
    int b = other.getrs();
            if (a > 8) {
                if (a > b)
                    return -1;
                else if (a < b)
                    return 1;
                else
                    return 0;
            }
            return 0;
        }
    });

but i am getting wrong , and I want to add more filter like > , < , or only that then for string also.

Upvotes: 0

Views: 156

Answers (1)

Arun Xavier
Arun Xavier

Reputation: 771

If you are using Java 8.

Use something like this.

 List<Model> completeModels = new ArrayList<>();

        completeModels.add(new Model(5, "Joe"));
        completeModels.add(new Model(3, "John"));
        completeModels.add(new Model(8, "Smith"));
        completeModels.add(new Model(10, "Lary"));

        List<Model> filtered = completeModels.stream().filter(u -> u.rs > 8).collect(Collectors.toList());

This will give you a list of Models with rs>8 .

For more reference google 'java 8 filter examples' or go through Stream Oracle Doc.

EDIT

Otherwise(if you are not using java 8) write a method to get the list filtered. I don't know other ways to do this.

eg:

private List<Model> getFilteredList(List<Model> completeModels) {

    List<Model> filtered = new ArrayList<>();

    for (Model m : completeModels) {
        if (m.rs > 8) {
            filtered.add(m);
        }
    }

    return filtered;
}

Upvotes: 1

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