public class TEsr {
    List<Person> set = new ArrayList();
    public static void main(String[] args) throws IOException {
    TEsr tesr = new TEsr();
    tesr.go();


    }
    public void go() throws IOException {
    set.add(new Person("Maks",42,true));
    set.add(new Person("Andy",22,false));
    set.add(new Person("Lex",99,false));
    set.add(new Person("Mary",18,false));

    if(set.isEmpty()) {
    throw new IOException("collection is empty");
    }
    else {
    Collections.sort(set, new Sort());
    set.remove(3);
    set.remove(2);
    set.remove(1);
    System.out.println(set);
    }
    }
}
class Person {
String name;
int age;
boolean men;
Person(String name,int age,boolean men) {
this.age = age;
this.name = name;
this.men = men;
}
public String toString()
    {
        return this.age + " " + this.name +
                           " " + this.men;
    }
}
class Sort implements Comparator<Person> {
public int compare(Person a, Person b)
    {
        return b.age - a.age;
    }
}