import * ;

public class TestFileOutputStream {
   
    public static void main (String args[]){
        
        int b = 0;
        FileInputStream in = null ;
        FileOutputStream out = null ;
        
        try {
            in = new FileInputStream ("e:/java/code8");
            out = new FileOutputStream ("e:/java/code8");
            while ((b=in.read()) != -1){
                out.write(b);
            }
            in.close();
            out.close();
        } catch (FileNotFoundException e2) {
            System.out.println ("not found the file");
            System.exit(-1);
        } catch (IOException e1) {
            System.out.println ("file copy error");
            System.exit(-1);
        }
        System.out.println("file already copy");
    }
}
请教如何实现复制？谢谢

不知道你是指哪方面的复制，问题请描述清楚一点

复制文件，刚刚已经找出问题在哪了，谢谢