java - 链接列表 getNext() 和 while(next!= null );问题

Question

我对java相当陌生，希望有人能够帮助我。我正在尝试创建一个链接列表来比较中奖号码和玩家号码，因为您可以在我的彩票计划中使用不同的名称购买多张彩票。该程序可以工作，但它只输出最后一张票的结果，而不是全部。这与 matches() 方法中的代码有关，但我不确定单击抽奖号码时如何输出每个人的彩票结果。任何帮助将不胜感激。

import java.io.*;
import java.util.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.JDialog;
import javax.swing.JOptionPane;
import javax.swing.JFrame;
import java.lang.Math.*;
import java.util.Scanner;

public class LOTTERY
{
    Scanner keyboard = new Scanner(System.in);

    private PLAYER pHead;

    WINNINGNUMBERS win = new WINNINGNUMBERS();

    public LOTTERY()
    {
        pHead = null;
    }

    public void welcome() {
        JOptionPane.showMessageDialog(null," Welcome to the Lottery Game. Press Ok to Continue", "Lottery Game",JOptionPane.INFORMATION_MESSAGE);
    }

    public void StartUpmenu() {


        Object[] options = {"Quit",
                "How To Play",
                "Buy Ticket"};
        int n = JOptionPane.showOptionDialog(null,"Please select one of the following buttons: ","Lottery Game",
                JOptionPane.YES_NO_CANCEL_OPTION,
                JOptionPane.PLAIN_MESSAGE,
                null,
                options,
                options[2]);

        if (n == 0) {
            exitOptions();
        } else if (n == 1) {
            rules();
        } else if (n == 2) {
            enterPlayerDetails();
            numOptionMenu();
            displayPlayers();
        }
    }

    public void rules() {
        System.out.println("How To Play The Lottery Game:" + "\n" + "\n" +
            "1. Enter Your Name" +  "\n" + "2. Select 6 Of Your Own Numbers or Choose A Lucky Dip." 
            + "\n" + "3. The Money You Win Will Be Revealed Based On The Amount Of Numbers You Matched" + "\n" + "\n" +
            "1 Number - £2" + "\n" + "2 Numbers - £10" + "\n" + "3 Numbers - £30" + "\n" + 
            "4 Numbers - £140" + "\n" + "5 Numbers - £1,750" + "\n" + "6 Numbers - £1 million");

        StartUpmenu();
    }

    public void enterPlayerDetails() {
        PLAYER pNext; 
        System.out.println("Enter your Name : ");
        String vName = keyboard.nextLine(); 
        System.out.println("What age are you?");
        int vAge = keyboard.nextInt();
        keyboard.nextLine();

        while (vAge < 16) {
            System.out.println("Sorry, You have entered an invalid age. You must be 16 or above");
            vAge = keyboard.nextInt();
            keyboard.nextLine();
        }

        pNext = new PLAYER(vName,vAge,pHead);
        pHead = pNext;
    }

    public void numOptionMenu() {
        PLAYER currentPlayer = pHead;
        Object[] options = { "Choose Your Own",
                "Lucky Dip"};
        int n = JOptionPane.showOptionDialog(null,"Please select one of the following buttons: ","Lottery Game",
                JOptionPane.YES_NO_CANCEL_OPTION,
                JOptionPane.PLAIN_MESSAGE,
                null,
                options,
                options[1]);

        if (n == 0) {
            currentPlayer.choose();
        } else if (n == 1) {
            currentPlayer.luckyDip();
        }
    }

    public void drawNumbersMenu() {
        PLAYER currentPlayer = pHead;
        Object[] options = { "Quit",
                "Draw Numbers", 
                "Buy Another Ticket"};
        int n = JOptionPane.showOptionDialog(null,"Please select one of the following buttons: ","Lottery Game",
                JOptionPane.YES_NO_CANCEL_OPTION,
                JOptionPane.PLAIN_MESSAGE,
                null,
                options,
                options[2]);

        if (n == 0) {
            exitOptions();
        } else if (n == 1) {
            displayWinningNumbers();
            matches();
            playAgainMenu();
        } else if (n == 2) {
            enterPlayerDetails();
            numOptionMenu();
            displayPlayers();
            drawNumbersMenu();
        }
    }

    public void playAgainMenu() {
        PLAYER currentPlayer = pHead;
        Object[] options = { "Quit",
                "Play Again"
            };
        int n = JOptionPane.showOptionDialog(null,"Please select one of the following buttons: ","Lottery Game",
                JOptionPane.YES_NO_CANCEL_OPTION,
                JOptionPane.PLAIN_MESSAGE,
                null,
                options,
                options[1]);

        if (n == 0) {
            exitOptions();
        } else if (n == 1) {
            runProg();
        }
    }

    public void displayPlayers() {
        PLAYER currentPlayer = pHead;
        System.out.println("Name: " + currentPlayer.getName());
        System.out.println("Age: " + currentPlayer.getAge());
        currentPlayer.luckyDip();
        currentPlayer.bubbleSort();
        System.out.println("Your Numbers: ");

        for (int i = 0; i < 6; i++) {
            System.out.println(currentPlayer.getNumbers(i));
        }
    }

    public void displayWinningNumbers() {
        win.winningNumbers();
        win.bubbleSort();
        System.out.println("Winning Numbers: ");

        for (int i = 0; i < 6; i++) {
            System.out.println(win.getWinningNumbers(i));
        }
    }

    public void matches() {
        PLAYER currentPlayer = pHead;
        PLAYER pNext; 
        
        do{
            int count = 0; 
            PLAYER next = pNext;
            for(int i = 0; i<6; i++) {
                for(int j = 0; j< 6; j++) {
                    if (win.getWinningNumbers(j) == next.getNumbers(i)) {
                        count++;
                    }
                }
            }

            if (count == 0) {
                System.out.println("Unlucky " + currentPlayer.getName() + " you haven't won anything");
            }
            else if (count == 1) {
                System.out.println("Congratulations " + currentPlayer.getName() + " you have won £2");
            }
            else if (count == 2) {
                System.out.println("Congratulations " + currentPlayer.getName() + " you have won £10");
            }
            else if (count == 3) {
                System.out.println("Congratulations " + currentPlayer.getName() + " you have won £30");
            }
            else if (count == 4) {
                System.out.println("Congratulations " + currentPlayer.getName() + " you have won £140");
            }
            else if (count == 5) {
                System.out.println("Congratulations " + currentPlayer.getName() + " you have won £1,750");
            }
            else if (count == 6) {
                System.out.println("Congratulations " + currentPlayer.getName() + " you have won the jackpot of £1 million !!!");
            }
            
            next = next.getNext();
            
        } while(next!= null );
    }
    

    public void exitOptions()
    {
        JOptionPane.showMessageDialog(null, "Thank you for Playing!", "End Game",JOptionPane.INFORMATION_MESSAGE);
        System.exit(0); 
    }

    public void runProg() {
        welcome();
        StartUpmenu();
        drawNumbersMenu();
    }

    public static void main(String[] args) {
        LOTTERY lottery = new LOTTERY();
        lottery.runProg();
    }
}

import java.io.*;
import java.util.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.JDialog;
import javax.swing.JOptionPane;
import javax.swing.JFrame;
import java.lang.Math.*;
import java.util.Scanner;

public class PLAYER
{
    private String vName;
    private PLAYER pNext;
    private int vAge;
    private int numbers[];

    public PLAYER(String n, int a, PLAYER p)
    {
        vName = n;
        pNext = p;
        vAge = a;
        numbers = new int[6];
        Random random = new Random();
    }

    public String getName() {
        return vName;
    }

    public int getAge() {
        return vAge;
    }

    public int getNumbers(int i){
        return numbers[i];
    }
    
    public int getNext(int next) {
      return next;
   }
    
    public void luckyDip() {
        ArrayList<Integer> list = new ArrayList<Integer>();
        for (int i = 1; i < 51; i++)
        {
            list.add(new Integer (i));
        }

        Collections.shuffle(list);

        for(int i = 0; i < 6; i++)
        {
            numbers[i] = (list.get(i));
        }
    }

    public void choose() {
       
    }

    public void bubbleSort() {
       
        for(int a = numbers.length; a > 0; a--){
            for(int i = 0; i < a-1; i++) {
                if(numbers[i] > numbers[i+1]) {
                    int temp = numbers[i+1];
                    numbers[i+1] = numbers[i];
                    numbers[i] = temp;
                }
            }
        }
    }
}

import java.io.*;
import java.util.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.JDialog;
import javax.swing.JOptionPane;
import javax.swing.JFrame;
import java.lang.Math.*;
import java.util.Scanner;

public class WINNINGNUMBERS
{
    private int wNumbers[];

    public WINNINGNUMBERS() {
      wNumbers = new int[6];
      Random ran = new Random();
    }
    
    public void setWinningNumbers(int [] wNumbers){
        this.wNumbers = wNumbers;
    }

    public int getWinningNumbers(int i){
        return wNumbers[i];
    }
    
    public void winningNumbers() {
        ArrayList<Integer> list = new ArrayList<Integer>();
        for (int i = 1; i < 51; i++)
        {
            list.add(new Integer (i));
        }
        
        Collections.shuffle(list);

        for(int i = 0; i < 6; i++)
        {
            wNumbers[i] = (list.get(i));
        }
    }
    
    public void bubbleSort() {
         for(int a = wNumbers.length; a > 0; a--){
            for(int i = 0; i < a-1; i++) {
                if(wNumbers[i] > wNumbers[i+1]) {
                    int temp = wNumbers[i+1];
                    wNumbers[i+1] = wNumbers[i];
                    wNumbers[i] = temp;
                }
            }
        }
        setWinningNumbers(wNumbers);
    }
}

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Answer 1

您应该修复 PLAYER 中的 getNext 函数，以便它返回一个玩家对象，该对象可以分配给 Lottery 中的 matches() 函数中的下一个。

目前它有一个整数参数并返回一个整数，但你将它用作next = next.getNext() 在你的 matches() 中。

我认为这就是你想要的

public PLAYER getNext() {
      return pNext;
}

编辑:为了简单起见，我省略了 if 语句。

public void matches() {
    PLAYER currentPlayer = pHead;
 // PLAYER pNext; remove this, since you are not using pNext in the if statments

    do{
        int count = 0; 
   //   PLAYER next = pNext; also remove this for the same reason
        for(int i = 0; i<6; i++) {
            for(int j = 0; j< 6; j++) {
                //check the winning numbers in currentPlayer instead of a null object pNext
                if (win.getWinningNumbers(j) == currentPlayer.getNumbers(i)) { 
                    count++;
                }
            }
        }
        // next = next.getNext(); remove for the same reason as above
        // since you are using currentPlayer to check if the player wins, you shouldto modify current player
        currentPlayer = currentPlayer.getNext(); 
        } while(currentPlayer != null ); //check if currentPlayer is not null
    }