Java - error comes up arraylist and object

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Java

package javaapplication10arraylistandobjects;


import java.util.ArrayList;
import java.util.*;

public class JavaApplication10Arraylistandobjects {


    public static void main(String[] args) {
test();

    }

    
     public static void test(){
         ArrayList<flights> mi = new ArrayList();
         flights p = new flights("Jony","iris",23);
         flights p1 = new flights("Jony","Kogan",21);
         mi.add(p);
         mi.add(p1);
         
         for (int i=0;i<mi.size();i++){
         System.out.println(mi.get(i));
         }
     }
}

-=Class=-

package javaapplication10arraylistandobjects;


public class flights {


    String f_name;
    String s_name;
    int age;


flights(String f_name,String s_name,int age){
        this.f_name = f_name;
        this.s_name = s_name;
        this.age = age;
    }


}

OUTPUT :

run:
javaapplication10arraylistandobjects.flights@4e25154f
javaapplication10arraylistandobjects.flights@70dea4e
BUILD SUCCESSFUL (total time: 0 seconds)

What I have tried:

No ideas at all.
I would like to know where's my mistake