在我将JAR文件转换为EXE后，程序抛出异常

Question

我有。java文件。它运行得很好。我将其转换为.jar文件。然后我尝试使用名为"exe4j"的程序将其转换为。exe文件，并成功转换。但是，当我打开这个。exe文件时，有一个错误消息:

java.util.NoSuchElementException
     at java.util.Scanner.throwFor(Unknown Source)
     at java.util.Scanner.next(Unknown Source)
     at penghitung.persentase(programguru.java:27)
     at programguru.main(programguru.java:361)
     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
     at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
     at java.lang.reflect.Method.invoke(Unknown Source)
     at com.exe4j.runtime.LauncherEngine.launch(Unknown Source)
     at com.exe4j.runtime.WinLauncher.main(Unknown Source)

这是什么意思?我很困惑，因为。java文件运行得很好。

下面是我的代码:

import java.util.*;
import java.io.*;
class penghitung
{
Scanner input = new Scanner(System.in);
int banyak, nilai, jumlah1, jumlah2, jumlah3, jumlah4, a, b, c, d, e, f, aa, bb, cc, dd, rata7;
long pengetahuan;
double numerik, rata1, rata2, rata3, rata4, rata5, rata6;
String pers, absen, predikat, prak, coba;
public void persentase()
{
    System.out.print("n           *************************************");
    System.out.print("n           ************START PROGRAM************");
    System.out.print("n           *************************************");
    System.out.print("nnDEFAULT : ");
    System.out.print("n  Tugas Sekolah  : 10 %");
    System.out.print("n  Tugas Rumah    : 10 %");
    System.out.print("n  Ulangan Harian : 20 %");
    System.out.print("n  UTS            : 25 %");
    System.out.print("n  UAS            : 30 %");
    System.out.print("n  Keaktifan      : 5%");
    System.out.print("nnApakah anda ingin mengganti persentase tiap kategori? (Y/T) : ");
    pers = input.next();
    a = 10;
    b = 10;
    c = 20;
    d = 25;
    e = 30;
    f = 5;
    if (pers.equals("Y") || pers.equals("y"))
    {
        System.out.print("n(Dalam persen)");
        System.out.print("n  Tugas Sekolah  : ");
        a = Integer.parseInt(input.next());
        System.out.print("  Tugas Rumah    : ");
        b = Integer.parseInt(input.next());
        System.out.print("  Ulangan Harian : ");
        c = Integer.parseInt(input.next());
        System.out.print("  UTS            : ");
        d = Integer.parseInt(input.next());
        System.out.print("  UAS            : ");
        e = Integer.parseInt(input.next());
        System.out.print("  Keaktifan      : ");
        f = Integer.parseInt(input.next()); 
    }
    System.out.print("nBanyak nilai Tugas Sekolah  : ");
    aa = Integer.parseInt(input.next());
    System.out.print("Banyak nilai Tugas Rumah    : ");
    bb = Integer.parseInt(input.next());
    System.out.print("Banyak nilai Ulangan Harian : ");
    cc = Integer.parseInt(input.next());
    System.out.print("nApakah ada nilai Praktikum? (Y/T) : ");
    prak = input.next();
    if (prak.equals("Y") || prak.equals("y"))
    {   System.out.print("Banyak nilai Praktikum : ");
        dd = Integer.parseInt(input.next());
    }
}   
public void absen()
{
    System.out.print("n----------------------------------------------------------------");
    System.out.print("nNomor absen murid : ");
    absen = input.next();
    try 
    {
        FileWriter out = new FileWriter("Data Nilai.txt", true);
        out.write("rn#################### NOMOR ABSEN MURID : "+ absen + "rn");
        out.close();
    }
    catch (IOException e) 
    {
        e.printStackTrace();
    }
}
public void tugasSekolah()
{
    System.out.print("nTUGAS SEKOLAHn");
    try 
    {
        FileWriter out = new FileWriter("Data Nilai.txt", true);
        out.write("rnTUGAS SEKOLAHrn");
        for (int i = 1; i <= aa; i++)
        {
            if(aa==1)
            {
                System.out.print("  Nilai : ");
                out.write("  Nilai = " + nilai + "rn");
                nilai = Integer.parseInt(input.next());
            }
            else 
            {   
                System.out.print("  Nilai ke-" +i+ " : ");
                nilai = Integer.parseInt(input.next());
                out.write("  Nilai ke-" +i+ " = " + nilai + "rn");
            }
            jumlah1 += nilai;
            rata1 = jumlah1 / aa * a / 100;   
        }
            out.close();
    }
    catch (IOException e) 
    {
        e.printStackTrace();
    }
}
public void tugasRumah()
{
    System.out.print("nTUGAS RUMAHn");
    try 
    {
        FileWriter out = new FileWriter("Data Nilai.txt", true);
        out.write("rnTUGAS RUMAHrn");
        for (int i=1; i<=bb; i++)
        {
            if(bb==1)
            {
                System.out.print("  Nilai : ");
                out.write("  Nilai = " + nilai + "rn");
                nilai = Integer.parseInt(input.next());
            }
            else 
            {
                System.out.print("  Nilai ke-" +i+ " : ");
                nilai = Integer.parseInt(input.next());
                out.write("  Nilai ke-" +i+ " = " + nilai + "rn");
            }
            jumlah2 += nilai;
            rata2 = jumlah2 / bb * b / 100;
        }
            out.close();
    } 
    catch (IOException e) 
    {
        e.printStackTrace();
    } 
}
public void ulanganHarian()
{
    System.out.print("nULANGAN HARIANn");
    try 
    {
        FileWriter out = new FileWriter("Data Nilai.txt", true);
        out.write("rnULANGAN HARIANrn");
        for (int i=1; i<=cc; i++)
        {
            if(cc==1)
            {
                System.out.print("  Nilai : ");
                out.write("  Nilai = " + nilai + "rn");
                nilai = Integer.parseInt(input.next());
            }
            else 
            {
                System.out.print("  Nilai ke-" +i+ " : ");
                nilai = Integer.parseInt(input.next()); 
                out.write("  Nilai ke-" +i+ " = " + nilai + "rn");
            }
            jumlah3 += nilai;
            rata3 = jumlah3 / cc * c / 100;
        }
            out.close();
    } 
    catch (IOException e) 
    {
        e.printStackTrace();
    } 
}
public void uts()
{
    System.out.print("nUTSn");
    System.out.print(" Nilai : ");
    nilai = Integer.parseInt(input.next());
    rata4 = nilai * d / 100;
    try 
    {
        FileWriter out = new FileWriter("Data Nilai.txt", true);
        out.write("rnUTSrn");
        out.write("  Nilai = " + nilai + "rn");
        out.close();
    }
    catch (IOException e) 
    {
        e.printStackTrace();
    } 
}
public void uas()
{
    System.out.print("nUASn");
    System.out.print(" Nilai : ");
    nilai = Integer.parseInt(input.next()); 
    rata5 = nilai * e / 100;
    try 
    {
        FileWriter out = new FileWriter("Data Nilai.txt", true);
        out.write("rnUASrn");
        out.write("  Nilai = " + nilai + "rn");
        out.close();
    }
    catch (IOException e) 
    {
        e.printStackTrace();
    } 
}
public void keaktifan()
{
    System.out.print("nKEAKTIFANn");
    System.out.print(" Nilai : ");
    nilai = Integer.parseInt(input.next());
    rata6 = nilai * f / 100;
    try 
    {
        FileWriter out = new FileWriter("Data Nilai.txt", true);
        out.write("rnKEAKTIFANrn");
        out.write("  Nilai = " + nilai + "rn");
        out.close();
    }
    catch (IOException e) 
    {
        e.printStackTrace();
    } 
}   
public void praktikum()
{
    if (prak.equals("Y") || prak.equals("y"))
    {
        System.out.print("nPRAKTIKUMn");
        try 
        {
            FileWriter out = new FileWriter("Data Nilai.txt", true);
            out.write("rnPRAKTIKUMrn");
            for (int i=1; i<=dd; i++)
            {
                if(dd==1)
                {
                    System.out.print("  Nilai : ");
                    out.write("  Nilai = " + nilai + "rn");
                    nilai = Integer.parseInt(input.next());
                }
                else 
                {
                    System.out.print(" Nilai ke-" +i+ " : ");
                    nilai = Integer.parseInt(input.next()); 
                    out.write("  Nilai ke-" +i+ " = " + nilai + "rn");
                }
                jumlah4 += nilai;
                rata7 = Math.round(jumlah4 / dd);
            }
                out.write("rn>>> NILAI PRAKTIK: " +rata7);
                out.close();
        } 
        catch (IOException e) 
        {
            e.printStackTrace();
        } 
        System.out.print("nn***NILAI PRAKTIK***     : "+rata7);
    }
}   
public void pengetahuan()
{
    System.out.print("n***NILAI PENGETAHUAN*** : ");
    pengetahuan = Math.round(rata1 + rata2 + rata3 + rata4 + rata5 + rata6);
    System.out.print(pengetahuan);
    try 
    {
        FileWriter out = new FileWriter("Data Nilai.txt", true);
        out.write("rn>>> NILAI PENGETAHUAN: " +pengetahuan);
        out.close();
    }
    catch (IOException e) 
    {
        e.printStackTrace();
    } 
}
public void predikat()
{
    if(pengetahuan > 75)
    {
        predikat = "TINGGI";
    } else if(pengetahuan == 75)
    {
        predikat = "SEDANG";
    } else
    {
        predikat = "KURANG";
    }
    System.out.print("n***PREDIKAT***          : " +predikat);
    try 
    {
        FileWriter out = new FileWriter("Data Nilai.txt", true);
        out.write("rn>>> PREDIKAT : " +predikat+ "rn");
        out.close();
    }
    catch (IOException e) 
    {
        e.printStackTrace();
    } 
}
public void menu()
{
    System.out.print("nnTambah lagi? (Y/T) : ");
    coba = input.next();
    if (coba.equals("Y") || coba.equals("y"))
    {
        absen();
        tugasSekolah();
        tugasRumah();
        ulanganHarian();
        uts();
        uas();
        keaktifan();
        praktikum();
        pengetahuan();
        predikat();
        menu();
    }
    else 
    {
        System.out.print("n           **************************************");
        System.out.print("n           *************EXIT PROGRAM*************");
        System.out.print("n           **************************************");
    }
}
}

public class programguru
{
public static void main (String args[])
{       
    penghitung penghitungku = new penghitung();
    //PERSENTASE NILAI
    penghitungku.persentase();
    //NOMOR ABSEN
    penghitungku.absen();
    //NILAI TUGAS SEKOLAH
    penghitungku.tugasSekolah();
    //NILAI TUGAS RUMAH
    penghitungku.tugasRumah();
    //NILAI ULANGAN HARIAN
    penghitungku.ulanganHarian();
    //NILAI UTS
    penghitungku.uts();
    //NILAI UAS
    penghitungku.uas();
    //NILAI KEAKTIFAN
    penghitungku.keaktifan();
    //NILAI PRAKTIKUM
    penghitungku.praktikum();
    //NILAI PENGETAHUAN
    penghitungku.pengetahuan();
    //PREDIKAT
    penghitungku.predikat();
    //MENU TAMBAH
    penghitungku.menu();
}
}

Answer 1

这里只是猜测，因为有不完整的信息:错误消息表明除了指示"没有这样的元素"之外，您在第一次执行"input.next();"的地方有错误。如果你使用的是Windows操作系统，并且你要通过双击文件夹中的一个图标来启动这个可执行文件，那么你必须弄清楚"System. exe"在哪里。"在"将来自。Windows不会自动打开命令窗口让你输入;如果你想要那样，你必须以不同的方式运行。