java - Print a set collection -

i'm studying collections right , learned saw set type of collection don't permit duplicate elements. ok, i've created class adds 3 int numbers collection. seems ok question is: how print collection? know override string method since elements integer type how that? expected output be: 2,3,2 4,5,6

the code (adding numbers)

public class adaugarenumere { int c=0; int f=0; int r=0;  adaugarenumere(int c, int f, int r){ this.c=c; this.f=f; this.r=r; }   } 

main class:

import java.util.*; public class executare {    public static void main(string[] args) {     adaugarenumere primulrand=new adaugarenumere(2,3,2);     adaugarenumere aldoilearand=new adaugarenumere(2,3,2);     adaugarenumere altreilearand=new adaugarenumere(4,5,6);     set<adaugarenumere> lista=new hashset<adaugarenumere>();     lista.add(primulrand);     lista.add(aldoilearand);     lista.add(altreilearand);     system.out.println("elementele listei: "+arrays.aslist(lista.tostring()));  }  } 

you need override tostring() method in adaugarenumere class.

example:

@override public string tostring() {     return "adaugarenumere [c=" + c + ", f=" + f + ", r=" + r + "]"; } 

and give list in sop statement.

system.out.println("elementele listei: " + lista); // no need `arrays.aslist()` or `tostring()`.