java - 构造函数已经在类中定义

Question

我开始学习java，并且正在编写一个简单的曲棍球统计类。它看起来像这样:

public class Player 
{
    private int games; 
    private int goals;
    private int assists;
    private char position;


    public Player()
    {
        games = 0;
        goals = 0;
        assists = 0;
        position = 'X';
    }


    public Player(int initialGames, int initialGoals, int initialAssists, 
    char initialPosition )

    {
        games = initialGames;
        goals = initialGoals;
        assists = initialAssists;
        position = initialPosition;

    } 

    public void setPlayer(int newGames, int newGoals, int newAssists, char 
newPosition)
    {
        games = newGames;
        goals = newGoals;
        assists = newAssists;
        position = newPosition;

    } 

    public Player(int initialGames)
    {
        games = initialGames;
        goals = 0;
        assists = 0;
        position = 'X';
    }

    public void setGames(int newGames)
    {
        games = newGames;
    }

    public Player(int initialGoals)
    {
        games = 0;
        goals = initialGoals;
        assists = 0;
        position = 'X';
    }


}

现在，这一切都编译得很好，直到我输入最后一个 block 的代码。当我尝试编译它时，出现以下错误:

(Player.java:52 错误:构造函数 Player(int) 已在类 Player 中定义)

我做错了什么？我非常严格地遵循教科书的格式来构建这门类(class)，但我不断遇到这个错误。谁能告诉我发生这种情况的原因吗？因为我不完全理解这个编译器错误。

Answer 1

您没有正确重载。

您有 2 个具有相同签名的构造函数。

public Player(int initialGoals)
    {
        games = 0;
        goals = initialGoals;
        assists = 0;
        position = 'X';
    }

和

public Player(int initialGames)
    {
        games = initialGames;
        goals = 0;
        assists = 0;
        position = 'X';
    }

因此，一种快速解决方案是合并两个构造函数。

public Player(int initialGoals, int initialGames)
    {
        games = initialGames;
        goals = initialGoals;
        assists = 0;
        position = 'X';
    }

有一个构造函数，并在参数不可用时传递零。

对于前

Player p = new Player(5,0); // games 0
Player p = new Player(0,5); // goals 0