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java硬币投掷模拟器问题

computer-science java

stev0104 · 技术社区 · 12 年前

嗨,我正在为java做一个掷硬币模拟器,必须以某种方式完成。它必须有一个用于sideup的字符串,以保存由无参数构造函数生成的字符串“heads”或“tails”,投掷方法必须为空,并且必须有getsideup方法,然后我们必须运行硬币投掷20次,并显示头部和尾部的数量。。。我可以很容易地使用非void方法,只需返回结果,但绕过这个void和getsidup会让我发疯。这是我目前所拥有的。

import java.util.Random;
public class coin {
    public static String sideUp;

    public static void toss() {
        Random rand = new Random();
        int sideup = rand.nextInt(2);
        if (sideup == 0) {
            sideUp = "heads";
        } else {
            sideUp = "tails";
        }
    }

    public static String getsideup() {
        System.out.println(sideUp);
        return sideUp;
    }

    public static void main(String[] args) {
        // coin coin = new coin();
        int hcount = 0;
        int tcount = 0;
        for (int i = 1; i <= 20; i++) {
            if (getsideup().equals("heads")) {
                hcount++;
            } else {
                tcount++;
            }
        }
        System.out.println("total heads = " + hcount + " total tails = " + tcount);
    }
}

我希望有人能告诉我我做错了什么,让我走上正确的方向。

4 回复 | 直到 12 年前

NESPowerGlove 12 年前

您没有在循环开始时调用toss()。这需要为sideUp设置一个值,并且需要让sideUp更改每次掷骰。

Dom 12 年前

简单的解决方法是在if语句之前将thross放入for循环,但我看到这里可以做很多事情。首先,我将为Coin类添加一个构造函数,并将hcount和tcount添加到类变量中,并使head和tail常量:

private String sideUp;
private int hcount;
private int tcount;
private static final String HEADS = "Heads";
private static final String Tails = "Tails";

Coin()
{
    this.sideUp = HEADS;
    this.hcount = 0;
    this.tcount = 0;
}

然后我会做一个检查投掷的方法:

public  void checkToss()
{
    if (getsideup().equals(HEADS)) 
        hcount++;
    else
        tcount++;
}

现在将toss()和checkCoin()方法添加到if语句之前的for循环中。应该是这样的:

for (int i = 1; i <= 20; i++)
{
    coin.toss(); 
    coin.checkToss();
}

我也会为头部计数和尾部计数做一个吸气器:

public int getHeadsCount()
{
    return this.hcount;
}

public int getTailsCount()
{
    return this.tcount;
}

所有东西放在一起看起来像这样:

import java.util.Random;
public class Coin 
{
    private  String sideUp;
    private int hcount;
    private int tcount;
    private static final String HEADS = "Heads";
    private static final String TAILS = "Tails";

    Coin()
    {
        this.sideUp = HEADS;
        this.hcount = 0;
        this.tcount = 0;
    }

    public void toss()
    {
        Random rand = new Random();
        int sideup = rand.nextInt(2);
        if (sideup == 0) 
            sideUp = HEADS;
        else 
            sideUp = TAILS;    
    }

    public String getsideup()
    {
        System.out.println(sideUp);
        return sideUp;
    }

    public void checkToss()
    {
    if (getsideup().equals(HEADS)) 
        this.hcount++;
    else
        this.tcount++;
    }

    public int getHeadsCount()
    {
        return this.hcount;
    }

    public int getTailsCount()
    {
        return this.tcount;
    }

    public static void main(String[] args)
    {
        Coin coin = new Coin();
        for (int i = 1; i <= 20; i++) 
        {
            coin.toss();
            coin.checkToss();
        }
        System.out.println("Total Heads = " + coin.getHeadsCount() + " Total Tails = " + coin.getTailsCount());
    }
}

-1

javawocky 12 年前

import java.util.Random;
public class coin
{
public static String sideUp;
public int hcount=0;
public int tcount=0;

public static void toss()
     {
        Random rand = new Random();
        int sideup = rand.nextInt(2);
        if (sideup == 0)
            {
                sideUp = "heads";
                hcount++;
            }
            else 
            {
                sideUp  = "tails";
                tcount++;
            } 
      }       

  public static void main(String[] args)
  {
    for(int i=0;i<20;i++)
    {toss();}
    System.out.println("total heads = " + hcount + " total tails = " + tcount);
   }
}

-1

Hirak 12 年前

for(int i = 1; i <= 20; i++) 
    {
        toss();
      if (getsideup().equals("heads")) 
      {
        hcount++;
      } else 
      {
        tcount++;
      }
    }