Java程序不起作用，使用.add函数获得两个错误

Question

所有内容都已编码，唯一阻止我运行该程序的是User Interface类中的以下2个错误。在“.add”下面有一条红色的波浪线，无论我做什么它都不会消失。任何帮助将不胜感激。

错误：

类型ArrayList中的方法add（BasketballStats）不适用于参数（Game）UserInterface.java

类型ArrayList中的方法add（BasketballStats）不适用于参数（Player）UserInterface.java

public class UserInterface {
        public void begin() {

    ArrayList < BasketballStats > bballstats = new ArrayList < BasketballStats > ();
    boolean finished = false;
    while (!finished) {
        int selection = showMenu ();
        switch(selection) {
        case 1: 
            bballstats.add(addPlayer());
            break;
        case 2: 
            bballstats.add(addGame());
            break;
        case 3: JOptionPane.showMessageDialog (null, "Displaying Details of Player or Game Stats", null, JOptionPane.PLAIN_MESSAGE);
                for (int i = 0; i < bballstats.size(); i++) {
                    JOptionPane.showMessageDialog (null, bballstats.get(i), "Players or Game Stats", JOptionPane.PLAIN_MESSAGE);
                    }
                JOptionPane.showMessageDialog (null, "There are "+bballstats.size()+" record(s) in the list", "Total records", JOptionPane.PLAIN_MESSAGE);
            break;
        case 4: finished = true;
            JOptionPane.showMessageDialog (null, "Program Terminated");
            break;
            default: 
                JOptionPane.showMessageDialog (null, "\n** Invalid Selection **\n", "ERROR", JOptionPane.ERROR_MESSAGE);

public class Player {
    //Attributes
    private String firstName;
    private String lastName;
    private double jerseyNumber;
    private String mainPlayingPosition;
    private String secondaryPlayingPosition;
    private double height;
    private double weight;
    private double minutesPlayed;
    //Constructors
    public Player () {
        super ();
        firstName = null;
        lastName = null;
        jerseyNumber = 0;
        mainPlayingPosition = null;
        secondaryPlayingPosition = null;
        height = 0.0;
        weight = 0.0;
        minutesPlayed = 0.0;
    }
    public Player (double p,double or,double dr,double a,double to,double pf,double b,double s,BasketballTeam bbt,String fn,String ln, double jn,String mpp, String spp, double h, double w, double mp) {
        super ();
        firstName = fn;
        lastName = ln;
        jerseyNumber = jn;
        mainPlayingPosition = mpp;
        secondaryPlayingPosition = spp;
        height = h;
        weight = w;
        minutesPlayed = mp;
    }
    //Setters
    public void setFirstName(String fn) {
        firstName = fn;
    }
    public void setLastName(String ln) {
        lastName = ln;
    }
    public void setJerseyNumber(int jn) {
        jerseyNumber = jn;
    }
    public void setMainPlayingPosition(String mpp) {
        mainPlayingPosition = mpp;
    }
    public void setSecondaryPlayingPosition(String spp) {
        secondaryPlayingPosition = spp;
    }
    public void setHeight(double h) {
        height = h;
    }
    public void setWeight(double w) {
        weight = w;
    }
    public void setMinutesPlayed(double mp) {
        minutesPlayed = mp;
    }
    //Getters
    public String getFirstName() {
        return firstName;
    }
    public String getLastName() {
        return lastName;
    }
    public double getJerseyNumber() {
        return jerseyNumber;
    }
    public String getMainPlayingPosition() {
        return mainPlayingPosition;
    }
    public String getSecondaryPlayingPosition() {
        return secondaryPlayingPosition;
    }
    public double getHeight() {
        return height;
    }
    public double getWeight() {
        return weight;
    }
    public double getMinutesPlayed() {
        return minutesPlayed;
    }
    @Override
    public String toString() {
        return "Player's First Name: " + firstName +
                "\n" + firstName + "'s Last Name: " + lastName +
                "\n" + firstName + " " + lastName + "'s Jersey Number: " + jerseyNumber +
                "\n" + firstName + " " + lastName + "'s Playing Position: " + mainPlayingPosition +
                "\n" + firstName + " " + lastName + "'s Secondary Playing Position: " + secondaryPlayingPosition +
                "\n" + firstName + " " + lastName + "'s Height: " + height +
                "\n" + firstName + " " + lastName + "'s Weight: " + weight +
                "\n" + firstName + " " + lastName + "'s Playing Time: " + minutesPlayed + super.toString();

    }


}

package basketball;

public class Game {
    //Attributes
        private double gameNumber;
        private String opponent, arenaLocation;
        //Constructors
        public Game () {
            super();
            gameNumber = 0;
            opponent = null;
            arenaLocation = null;
        }
        public Game (double p,double or,double dr,double a,double to,double pf,double b,double s,BasketballTeam bbt,double gn,String opp,String al) {
            super ();
            gameNumber = gn;
            opponent = opp;
            arenaLocation = al;
        }
        //Setters
        public void setGameNumber(double gn) {
            gameNumber = gn;
        }
        public void setOpponent(String opp) {
            opponent = opp;
        }
        public void setArenaLocation(String al) {
            arenaLocation = al;
        }
        //Getters
        public double getGameNumber() {
            return gameNumber;
        }
        public String getOpponent() {
            return opponent;
        }
        public String getArenaLocation() {
            return arenaLocation;
        }
        @Override
        public String toString() {
            return "Game Number: " + gameNumber +
                    "Opponent: " + opponent +
                    "Arena: " + arenaLocation + super.toString();

        }

    }

Answer 1

您正尝试将Player和Game添加到ArrayList bballstats，它只接受BasketballStats类型的变量。 ArrayList只能存储一种（ArrayList<TypeWhichCanBeStored>）的值，因此您需要为每个值创建单独的列表。

ArrayList <BasketballStats> bballstats = new ArrayList <BasketballStats> ();
ArrayList <Game> games = new ArrayList <Game> ();
ArrayList <Player> players = new ArrayList <Player> ();