它編譯得很好,但是當我嘗試從控制檯運行它時,出現ClassNotFoundException錯誤。但如果我從Eclipse運行它,它工作正常。爲什麼?IO程序不能從控制檯運行,但它通過Eclipse(Java)運行
我使用「javac FileIO.java」編譯和「java FileIO」來運行它。
import java.io.BufferedReader;
import java.io.PrintWriter;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.FileReader;
import java.io.FileOutputStream;
public class FileIO {
public static void main(String[] args){
PrintWriter pw = null;
BufferedReader bfr = null;
String linea = null;
try{
bfr = new BufferedReader(new FileReader("Records"));
linea = bfr.readLine();
} catch(FileNotFoundException fnfex){
System.out.println("Check you have reading/writing access.");
} catch(IOException ioex){
ioex.printStackTrace();
}
try{
pw = new PrintWriter(new FileOutputStream("Copy Records"));
} catch(FileNotFoundException fnfex){
System.out.println("Check you have reading/writing access.");
}
while(linea != null){
pw.println(linea);
try{
linea = bfr.readLine();
} catch(IOException ioex){
ioex.printStackTrace();
}
}
try{
bfr.close();
} catch(IOException ioex){
ioex.printStackTrace();
}
pw.close();
}
}`
完整的堆棧跟蹤:
`Exception in thread "main" java.lang.NoClassDefFoundError: FileIO/java
Caused by: java.lang.ClassNotFoundException: FileIO.java
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClassInternal(Unknown Source)
Could not find the main class: FileIO.java. Program will exit.
`
向我們展示完整的'stacktrace'。 – RanRag 2012-02-28 20:17:49
當你沒有展示你如何編譯它,你如何試圖運行它,或者錯誤信息是什麼時,很難提供幫助。 – 2012-02-28 20:18:03
哪些類缺失? – 2012-02-28 20:19:17