java - "Actual or formal argument lists differs in length" -

when try put in () brackets of friends f = new friends(friendsname, friendsage); comes error:

constructor friends in class friends cannot applied given types. required: no arguments. found: string, int. reason: actual or formal argument lists differ in length.

but when take out arguments friends list displays "null 0". values not set though have string friendsname = input.next();?

also, when try remove friend, doesn't anything. in source code bring warning,

suspicious call util.java.collection.remove: given object cannot contain given instances of string (expected friends).

i'm confused on means?

import java.util.arraylist; import java.util.scanner;  public class friends {     public static void main( string[] args )     {         int menu;                int choice;         choice = 0;                scanner input = new scanner(system.in);         arraylist< friends > friendslist = new arraylist<  >();                 system.out.println(" 1. add friend ");         system.out.println(" 2. remove friend ");         system.out.println(" 3. display friends ");         system.out.println(" 4. exit ");         menu = input.nextint();          while(menu != 4)         {                  switch(menu)             {                                   case 1:                  while(choice != 2)                 {                     system.out.println("enter friend's name: ");                     string friendsname = input.next();                     system.out.println("enter friend's age: ");                     int friendsage = input.nextint();                                                    friends f = new friends(friendsname, friendsage);                     friendslist.add(f);                     system.out.println("enter another? 1: yes, 2: no");                     choice = input.nextint();                 } break;              case 2:                  system.out.println("enter friend's name remove: ");                 friendslist.remove(input.next());                                    break;                 case 3:                  for(int = 0; < friendslist.size(); i++)                 {                     system.out.println(friendslist.get(i).name + " " + friendslist.get(i).age);                                         } break;                         }          system.out.println(" 1. add friend ");         system.out.println(" 2. remove friend ");         system.out.println(" 3. display friends ");         system.out.println(" 4. exit ");         menu = input.nextint();      }      system.out.println("thank , goodbye!");  }      public string name;     public int age;          public void setname( string friendsname )     {         name = friendsname;     }      public void setage( int friendsage )     {         age = friendsage;     }     public string getname()     {         return name;     }     public int getage()     {         return age;     } } 

you try instantiate object of friends class this:

friends f = new friends(friendsname, friendsage); 

the class not have constructor takes parameters. should either add constructor, or create object using constructor exist , use set-methods. example, instead of above:

friends f = new friends(); f.setname(friendsname); f.setage(friendsage);