Question

String data="";
    System.out.println();  
    BufferedReader input = new BufferedReader(new FileReader("data.txt"));
    String items[]=new String [9];
    boolean match = false; 
    int count =0;
    while(data!=null)
    {
        data=input.readLine();
        if (data==null)
            break;
        items=data.split(",");
        if(items[6].equalsIgnoreCase(items[2] ))
        {
            match=true;
            count++;
            break;
        }
    }
    if (match==true)
    {
        System.out.println(" There are " +count+ " females are there in Year 3");
    }
    else if (match==false)
    {
        System.out.println("There are not females in Year 3");
    }
}

3年级有多少女性？这就是我要做的事情我是文件处理的新手，所以我真的不知道我将如何将“f”与第3年进行比较。“Belows是我老师制作的一些假数据

Amath,Brandon,522442,M,2H1,2D2,S2,970721,2893660440, ,AWQ2O0ECHC2D0ECHV2O0BENG2D0DFSF2D0AGLC2O0BMPM2D0APPL2OMBSNC2D0C
Amber,Joelle,568328,F,4X1,4Q2,S4,950606,9055342231, ,AVI4M0AMCV4U0BMDM4U0BMHF4U0CSBI4U0CSCH4U0A
Amin,Emily,235357,F,BC, ,S1,980416,6478662666, ,CHC2D0EENG2D0FICS2O0BMPM2D0BSNC2D0CTDJ2O0ATEJ2O0ATGJ2O0A
Amin,Oliver,547733,M,4X1,4F2,S4,950130,6471307561, ,BBB4M0ABOH4M0ACLN4U0BCPW4U0BENG4U0FHHS4M0AMDM4U0A
Ananthan,Kamala,437254,F,2D1,3M2,S3,960817,2892548340, ,CLU3E0AENG2P0BENG3C0DGPP3O0AMBF3C0DMFM2P0APAF3OMAPPL3OMB
Anders,Trinidad,674842,F,4M1,4H2,S4,950622,6477645846, ,ENG4U0CMCV4U0BMHF4U0ASBI4U0BSCH4U0CSPH3U0ASPH4U0B
Anderson,Estell,148811,F,1H1,1A2,S1,980317,2895001864, ,ADA1O0BBTT1O0ACGC1D0GENG1D0BFSF1D0DMPM1D0CPAI1OFASNC1D0D
Anderson,Hui,215777,M,4I1,4J2,S4,950715,6470662050, ,BAT4M0ABBB4M0BENG4C0CHZT4U0AMAP4C0BTPJ4C0A
Andresen,Kali,557484,M,4X1,4B2,S4,950826,9053465826, ,GLN4OCDGLC2OCDGLN4O0DHRT3M0AMAP4C0CSBI3C0B
Andropopogiopanatakis,Jann,386122,M,4Q1,2H2,S4,950512,6475802413, ,AVI3M0AAVI4M0ABMI3C0BENG4E0AGLE4O0BMEL4E0AOLC4OIFPPL4OMC
Angus,Rusty,486415,M,4L1,4X4,S4,950321,9051102066, ,BBB4M0ACGR4M0BCHI4U0AENG4C0HHFA4M0AMAP4C0C
Antunes,Patty,286127,F,3F1,4G2,S3,960920,9054824084, ,AVI2O7ABDI3CICENG4U0GHNB4O0AHNC3O0BHPC3OICHSP3M0BMBF3C0D
Aponte,Lacresha,221322,F,1A1,1H2,S1,980109,6476014868, ,AVI1O0ABTT1O0CCGC1D0CENG1D0DFSF1D0DMPM1D0GPAI1OFASNC1D0A
Aramburu,My,585147,F,4D1,4X4,S4,950707,9053410243, ,ENG3U0CHFA4M0BHHG4M0A
Arayaz,Merlin,148728,F,4C1,4F2,S4,950422,6478578314, ,CGR4M0ACHI4U0ACHY4U0BCPW4U0BENG4U0AEWC4U0AMAP4C0EMBF3C0B
Archer,Berna,571327,F,4D1,4L2,S4,950508,9055572668, ,GLN4OCEENG4U0DGLC2OCEGLN4O0EHFA4M0BHHG4M0A
Ashwell,Julee,844262,F,4X1,2E2,S2,970319,9052868453, ,AWQ2O0CCHC2D0DHFN2O0FMPM2D0D
Attrell,ShirlEy,153363,F,3A1,3F2,S4,950106,2891743101, ,AWQ2O0DBOG4E0ABTA3O0AENG4C0FHIR3C0AMEL3EIESBI3C0C
Ayers,Arlena,166658,M,3A1 ,3F2 ,S3,960428,6477376427, ,CHC2D0EENG2D0FICS2O0BMPM2D0BSNC2D0CTDJ2O0ATEJ2O0ATGJ2O0A

Answer 1

试试这个

import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;

public class ReadFile {

    public static void main(String[] args) throws IOException {
        BufferedReader input = new BufferedReader(new FileReader("data.txt"));
        String data = input.readLine();
        int sexIndex = 3;
        int yearIndex = 6;
        String femaleSex = "F";
        String year = "S3";
        int count = 0;
        while (data != null) {
            String[] chunks = data.split(",");

            if (chunks.length >= 6) { // to avoid IndexOutOfBoundException for invalid input
                if (chunks[sexIndex].equalsIgnoreCase(femaleSex) && chunks[yearIndex].equalsIgnoreCase(year)) {
                    count++;
                }
            }
            data = input.readLine();
        }

        if (count > 0)
        {
            System.out.println(" There are " +count+ " females are there in Year 3");
        }
        else
        {
            System.out.println("There are not females in Year 3");
        }
    }
}

输出

There are 2 females are there in Year 3

Answer 2

根据评论中的讨论，if语句的正确条件应为

if(items[3].equalsIgnoreCase("F") && items[6].equalsIgnoreCase("S3") ) {

即，您希望在条件

时执行某些操作

第四个字段（数组从零开始）匹配＆＃34; f＆＃34;
第七个字段匹配＆＃34; S3＆＃34;

都是真的。

下一步

    {
        match=true;
        count++;
        break;
    }

这里，break指示代码突破周围的循环，即while循环。删除该中断，并且porgram将实际读取文件中的所有行。

Answer 3

要明确你的意思是计算第3年的女学生吗？如果是这样的想法（自从分配以来没有给出确切的代码）是：阅读每一行，考虑使用更清洁的版本：

while((data=input.readline())!=null){}

在数组中拆分行和存储令牌检查性别标记是否为女性以及年份是否等于3 如果是这样，增加你的数量为所有行做这个打印结果并退出

比较文件java中的两个字符串

3 个答案: