IO流的读写操作

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;


public class ByteFile {
private String filename;
public ByteFile(String filename)
{
    this.filename=filename;
}
public void writeToFile(byte[] buffer) throws IOException
{
    FileOutputStream fout=new FileOutputStream(this.filename);
    fout.write(buffer);
    fout.close();   
    }
public void readFromFile() throws IOException
{
    FileInputStream fin=new FileInputStream(this.filename);
    System.out.println(this.filename+": ");
    byte[] buffer=new byte[512];
    int count=0;
    do{
        count=fin.read(buffer);
        for(int i=0;i<count;i++)
            System.out.print(buffer[i]+" ");
        System.out.println("count="+count);
    }
    while(count!=-1);
    fin.close();
    }
public void copyFile(String filename2)throws IOException
{
    FileInputStream fin=new FileInputStream(this.filename);
    FileOutputStream fout=new FileOutputStream(filename2);
    byte[] buffer=new byte[512];
    int count=fin.read(buffer);
    while(count!=-1)
    {
        fout.write(buffer, 0, count);
        count=fin.read(buffer);
    }
    fin.close();
    fout.close();
    System.out.println("CopyFile from"+this.filename+" to "+filename2);
    }
public static void main(String[] args) throws IOException{
    byte[] buffer={0,1,2,3,4,5,6,7,8,9};
    ByteFile afile=new ByteFile("f:\\test\\aa.txt");
    afile.writeToFile(buffer);
    afile.readFromFile();
    afile.copyFile("f:\\test\\cc\\zz.txt");
}
}
这段代码所操作的文件的写入的文件内容为Ā̂Ԅ܆ई是什么意思啊，求解释？
----------------解决方案--------------------------------------------------------
就是把buffer的内容打印到指定路径的文件上，这里好像有编码问题，你的打印出来的是乱码。
自己在百度下，然后调调
----------------解决方案--------------------------------------------------------