java - ArrayList add null pointer -

java - ArrayList add null pointer -

the next class keeps giving me null pointer when seek phone call addplayer method , have no thought heck i'm doing wrong. : maintain in mind simple stuff...supposedly... i'm learning java.

import java.util.*; public class team { private string teamname; private arraylist<player> players; private int numberofplayers; public team(string teamname) { this.teamname = teamname; } public string getname() { homecoming this.teamname; } public void addplayer(player player) { this.players.add(player); } public void printplayers() { (player player : this.players) { system.out.println(player); } } }

here player class :

public class player { private string name; private int goals; public player(string name) { this.name = name; } public player(string name, int goals) { this.name = name; this.goals = goals; } @override public string tostring() { homecoming this.getname() + ", goals " + this.goals(); } public string getname () { homecoming this.name; } public int goals() { homecoming this.goals; } }

this problem:

private arraylist<player> players;

is not initialized, never create new 1 when instantiate class.

add next constructor:

public team(string teamname) { this.teamname = teamname; this.players = new arraylist<player>(); }

java arraylist