java - 如何获取和设置对象数组中的名称？

Question

我有一个家庭作业，但我对 Java 很陌生，过去两天一直在尝试创建玩家对象数组、设置名称并获取名称。

但是无论我尝试什么，我都会遇到错误。我看了很多教程，并准确地复制了他们所做的事情，但它不起作用。如何正确创建数组并获取/设置名称？

我有一个 Game 类和一个 Player 类:

游戏类——一个版本:

Player[] players = new Player[3];

//All the tutorials I've seen show both these types of putting names in:

players[0] = new Player(); 

//followed by:
players[0].setName("name");
//or...

players[0] = new Player("human"); 

 //my errors on both: unknown class 'players'... 
//unexpected token... invalid method... etc etc

Gmae 类 - 不同版本(使用方法):

//for the homework, I'm expected to put it all into a method
//ideally I'd be using the setName method from the Players class (below)
//but that doesn't work here

void createPlayers(Player[] players) { 
    for (Player p : players) {
        players[0] = new Player("human");
        players[1] = new Player("Greg");
        players[2] = new Player("Susan");
    }
}

public static void main(String[] args) {
Game obj = new Game();

//I had to change Players[] to static to get a printout but it's not supposed 
//to be static

 //I tried these separately to check output
//I need to be able to get the name of a player

    obj.createPlayers(players); //no output 

    for (Player pl : players) {
        System.out.println("Name = " + pl); //null null null
    }
    System.out.println(obj.players[0]); //null
    obj.player[0].getName(); //cannot resolve symbol 'player'
}

游戏类 - 另一个版本(将所有内容放在 main 中):

public static void main(String args[]) {
    Main game = new Main();

    Player p0 = new Player("Jeff"); //it errored if I didn't put a name
    Player p1 = new Player("Susan"); //but I need to be able to change names
    Player p2 = new Player("Michael");

    Player[] players = new Player[3];
    players[0] = p0;
    players[1] = p1;
    players[2] = p2;

    p2.setPName("Alan");
    System.out.println(p2.getPName()); //output: null

玩家类:具有 getter 和 setter，我理想情况下会使用它们来获取和设置玩家名称，但我不知道如何使它们在我的 Game 类中工作。

private String name;

Player (String name) { this.name = name; }

public void setName(String name) { this.name = name;  }

public String getName() { return name; }

Answer 1

对您的 Game 类进行简单修改后，我得到了这个，这几乎可以实现您想要做的事情:

public class Game {

        void createPlayers(Player[] players) {
            Player player1 = new Player();
            player1.setName("human");

            Player player2 = new Player();
            player2.setName("Greg");

            Player player3 = new Player();
            player3.setName("Susan");

            players[0] = player1;
            players[1] = player2;
            players[2] = player3;
        }

        public static void main(String[] args) {
            Player[] players = new Player[3];

            Game obj = new Game();
            obj.createPlayers(players);

            for (Player pl : players) {
                System.out.println("Name = " + pl.getName());
            }
        }
    }