Compare integers java sort

public class AgeComparatorDesc implements Comparator<Student> {

  @Override
  public int compare(Student o1, Student o2) {
    if (o1.age > o2.age) {
        return -1;
    } else if (o1.age < o2.age) {
        return 1;
    }    
     return 0;
  }

}

Source: stackoverflow.com

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