如何在 java 中从文件中分离项目

Question

下午好，我目前正在尝试读取一个文件的内容，并根据它们出现的次数将它们添加到各自的变量中。该程序旨在计算 2 个后代家庭中男孩或女孩的概率。 BB 表示 2 个男孩，GG 表示 2 个女孩，GB 或 BG 表示男孩和女孩。文件信息如下：

BB

GB

GB

BG

GG

GB

GB

GB

GB

GG

这是我编码的内容：

import java.util.Scanner;
import java.io.File;
import java.io.IOException;
public class Family
{
   public static void main (String args[]) throws IOException {
    //variables defined
    int numGB = 0;
    int numBG = 0;
    int numGG = 0;
    int numBB = 0;
    int totalNum = 0;
    double probBG;
    double probGG;
    double probBB;
    String token ="";
    int spaceDeleter = 0;
    int token2Sub = 0;
    
    File fileName = new File ("test1.txt"); 
    
    Scanner in = new Scanner(fileName); //scans file
    
    System.out.println("Composition statistics for families with two children");
    while(in.hasNextLine())
    {
        token = in.next( ); //recives token from scanner
        if(token.equals("GB"))
        {
        numGB = numGB + 1;
        }
        else if(token.equals("BG"))
        {
        numBG = numBG + 1;
        }
        else if(token.equals("GG"))
        {
        numGG = numGG + 1;
        }
        else if(token.equals("BB"))
        {
        numBB = numBB + 1;
        }
        else if(token.equals(""))
        {
        spaceDeleter =+ 1; //tried to delete space to no avial
        }
        else 
        {
        System.out.println("Data reading error");
        }
    }
    in.close(); //closes file
    
    totalNum = numBB + numGG + numBG + numGB; // calculates total num of tokens
    probBG = (numBG + numGB) / totalNum; //Probability of boy and girl
    probBB = numBB / totalNum; // Probability of Boy
    probGG = numGG / totalNum; //Probability of girl
    
    System.out.println("Total number of families: " + totalNum); //print results to user
    System.out.println("");
    System.out.println("Number of families with");
    System.out.println("\t 2 boys: " + numBB + " represents " + probBB + "%");
    System.out.println("\t 2 girls: " + numGG + " represents " + probGG + "%");
    System.out.println("\t 1 boy and 1 girl: " + (numBG + numGB) + " represents " + probBG + "%");
}
}

Answer 1

我不知道这是否能回答您的问题，但据我了解，您想要分隔文本文件中的每一行。如果是这种情况，您可以编写一个包含两种情况的 switch 语句，A 和 B。您希望循环遍历一行中的每个字符：

for(int i = 0; i<2; i++){
   switch(token.charAt(i)){
       case 'G':
           <Some variable>
           break;
       case 'B':
           <Some variable>
           break;
    }
}

P.S: 我不是专家，我只是个学生