Java在Notepad++运行后找不到主类错误

Question

在运行java by Notepad++脚本之前，我在Win 7 Ultimate中仅使用文件名（例如javac program.java和java程序）运行java by命令提示符。

在使用Notepad++脚本并将Java更新到版本jdk-8u77-windows-i586后，我只能通过Notepad++运行Java。我得到了

NPP_SAVE
cd "$(CURRENT_DIRECTORY)" 
"C:\Program Files (x86)\Java\jdk1.8.0_77\bin\javac" $(FILE_NAME)
"C:\Program Files (x86)\Java\jdk1.8.0_77\bin\java"  -classpath "$(CURRENT_DIRECTORY)" "$(NAME_PART)"

C:\Program Files (x86)\Java\jdk1.8.0_77\bin;C:\Program Files (x86)\Java\jre1.8.0_77\bin

C:\Program Files (x86)\Java\jdk1.8.0_77

C:\ProgramData\Oracle\Java\javapath;C:\Program Files (x86)\Java\jdk1.8.0_77\bin;C:\Program Files (x86)\Java\apache-maven-3.3.9\bin;C:\xampp\ImageMagick-6.9.1-Q16;C:\Python27\;C:\Python27\Scripts;C:\Python27\DLLs;%SystemRoot%\system32;%SystemRoot%;%SystemRoot%\System32\Wbem;%SYSTEMROOT%\System32\WindowsPowerShell\v1.0\;D:\Dhay\Tasks by me\Firefox addon job\addon-sdk-1.17\bin;C:\Program Files\MySQL\MySQL Server 5.1\bin;C:\Program Files\Google\Cloud SDK\google-cloud-sdk\bin;C:\Program Files (x86)\Common Files\lenovo\easyplussdk\bin;C:\Program Files (x86)\QuickTime\QTSystem\

import java.io.*;
class CopyFile
{
    public static void main (String args[]) throws IOException
    {
        int i;
        FileInputStream fin = null;
        FileOutputStream fout = null;
        if(args.length != 2)
        {
            System.out.println("Usage: CopyFile from to");;
            return;
        }
        try
        {
            fin = new FileInputStream(args[0]);
            fout = new FileOutputStream(args[1]);
            do {
                i = fin.read();
                if(i != -1) fout.write(i);
            } while(i != -1);
        } catch(IOException e){
            System.out.println("I/O Error: " + e);
        } finally {
            try 
            {
                if(fin != null) fin.close();
            } catch(IOException e2)
            {
                System.out.println("Error Closing Input file");
            }
            try
            {
                if(fout != null) fout.close();
            } catch(IOException e2)
            {
                System.out.println("Error Closing Output File");
            }
        }
    }
}

即使是我也可以在命令行中运行它

java -classpath . CopyFile

我只是好奇可能会有什么问题。

Answer 1

当前目录不在类路径中，所以java找不到您的类，然后告诉java，到当前目录查找CopyFile的方法如下：

java -classpath . CopyFile