CoreJava/exp8/TreeSetDemo.java

package exp8;

import java.util.Comparator;
import java.util.TreeSet;

class Roomate{
    String name;
    int age;

    Roomate(String name, int age){
        this.name = name;
        this.age = age;
    }
}

public class TreeSetDemo {
    TreeSet<Roomate> rs = new TreeSet<>(new Comparator<Roomate>() {
        @Override
        public int compare(Roomate r1, Roomate r2){
            return Integer.compare(r1.age, r2.age);
        }
    });

}