int id, String name ,String surname,int age -- with getters and setters

List <Person> persons = new ArrayList<Person>();

package stackoverflow.q_24935480;

import java.util.HashSet;
import java.util.Set;

public class TestPersonInSet {
    public static void main(String[] args) {
        Set<Person> s = new HashSet<Person>();
        Person p1 = new Person(); p1.setName("abc");
        Person p2 = new Person(); p2.setName("abc");
        s.add(p1);
        s.add(p2);
        System.out.println("Set size is " + s.size());
    }

    static class Person {
        private String name;

        public void setName(String name) {
            this.name = name;
        }

        @Override
        public int hashCode() {
            final int prime = 31;
            int result = 1;
            result = prime * result + ((name == null) ? 0 : name.hashCode());
            return result;
        }

        @Override
        public boolean equals(Object obj) {
            if (this == obj)
                return true;
            if (obj == null)
                return false;
            if (getClass() != obj.getClass())
                return false;
            Person other = (Person) obj;
            if (name == null) {
                if (other.name != null)
                    return false;
            } else if (!name.equals(other.name))
                return false;
            return true;
        }

    }
}

//Output:
//Set size is 1