How to sort an arraylist of objects using one common property

Question

I have an arraylist of Student objects which have several properties including first and last name, gpa, UID (university ID number), and more. I am stumped on how to sort the arraylist using the UID. The UID is an integer number, however, I'm forced to have it in String format for this project. If I can parse the numeric string into an int, how then can I sort the arraylist from lowest to highest using that number?

Possible duplicate of Sort ArrayList of custom Objects by property — cabolanoz
– cabolanoz, Commented Apr 29, 2017 at 5:04

Costi Ciudatu · Accepted Answer · 2012-11-19 15:17:01Z

2

List<Student> students = // create and populate your list...
Collections.sort(students, new Comparator<Student>() {
    @Override
    pulbic int compare(Student s1, Student s2) {
        return Integer.valueOf(s1.getUid())
                .compareTo(Integer.valueOf(s2.getUid));
    }
}

answered Nov 19, 2012 at 15:17

Costi Ciudatu

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chry · Accepted Answer · 2017-10-04 12:47:24Z

0

 Collections.sort(users, new Comparator<User>() {
            @Override
            public int compare(User first, User second) {
                return Double.compare(first.getAge(), second.getAge());
            }
        });

answered Oct 4, 2017 at 12:47

chry

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