[Solved] Java. Compare two objects values in LinkedList

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First, add implements Comparable<Student> to class header and compareTo() method to Student class:

@Override
public int compareTo(Student other) {
    return Integer.valueOf(this.indexnr).compareTo(other.indexnr);
}

Then, sort your list:

List<Student> list3 = ...; //some logic to fill list
Collections.sort(list3);

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solved Java. Compare two objects values in LinkedList