Java 老虎机类

Question

我正在编写一个老虎机类，它生成 3 个由 3 个随机数组成的数组，并检查所有数字是否匹配，如果匹配，则宣布它们获胜。我编写了另一个程序来运行 1000 台老虎机并计算获胜者。我面临的问题是它总是给我 0 个获胜者。有什么帮助吗？以下是每个的代码:

老虎机类

import java.util.*;

public class SlotMachine{

    private int[] row1 = new int[3];
    private int[] row2 = new int[3];
    private int[] row3 = new int[3];

    public SlotMachine() {
        playMachine();
    }

    public void playMachine() {

        Random rand = new Random();

        for (int counter = 0; counter < 3; counter++) {
            row1[counter] = rand.nextInt(10);
        }

        for (int counter = 0; counter < 3; counter++) {
            row2[counter] = rand.nextInt(10);
        }

        for (int counter = 0; counter < 3; counter++) {
            row3[counter] = rand.nextInt(10);
        }
    }

    public boolean isWinner() {

        if (row1[0] == row1[1]) {
            if (row1[0] == row1[2]) {
                return true;
            }
        }

        if (row2[0] == row2[1]) {
            if (row2[0] == row2[2]) {
                return true;
            }
        }

        if (row3[0] == row3[1]) {
            if (row3[0] == row3[2]) {
                return true;
            }
        }

        return false;
     }
}

获胜计数器:

import java.util.*;

public class Play1000SlotMachines {

    public static void main(String[] args) {
        SlotMachine slotMachine = new SlotMachine();
        int count = 0;

        for (int i = 0; i < 1000; i++) {
            if (slotMachine.isWinner() == true) {
                count = count + 1;
            }
        }

        System.out.println("From 1000 slot machines, " + count + " were winners.");
    }
}

Answer 1

您永远不会重新滚动老虎机。我还更改了该方法的名称，以反射(reflect)此实现。如果您想玩 1000 台不同的老虎机，请将新老虎机的声明移至 for 循环中。这将创建老虎机类的 1000 个不同实例，而不是下面的实现，其中创建老虎机的单个实例，然后玩 1000 次。一个重要的区别。

public class PlaySlotMachine1000Times {
  public static void main(String[] args) {

    SlotMachine slotMachine = new SlotMachine();
    int count = 0;

    for (int i = 0; i < 1000; i++) {
      slotMachine.playMachine();
      if (slotMachine.isWinner())
         count++;
    }
    System.out.println("From 1000 slot machines, " + count + " were winners.");
  }
}