当我尝试调用addPlayer方法时,下面的类一直给我一个空指针,我不知道我做错了什么.:请记住这是非常简单的东西......据说......我正在学习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() {
return this.teamName;
}
public void addPlayer(Player player) {
this.players.add(player);
}
public void printPlayers() {
for (Player player : this.players) {
System.out.println(player);
}
}
}
这是Player类:
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; …