【无标题】IO流实现文件的复制，并用异常处理

package JB2015;

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

public class QG {
    public static void main(String[] args)  {
        FileInputStream fileInputStream=null;//定义读取文件对象
        FileOutputStream fileOutputStream=null;//定义写入文件对象
        try {           //用try catch 处理异常
            fileInputStream = new FileInputStream("D:\untitled\q1"); //创建读取文件对象
          fileOutputStream = new FileOutputStream("D:\untitled\src\JB2015\q2");//创建写入文件对象
            int by;
            while ((by = fileInputStream.read()) != -1) {  
                fileOutputStream.write(by);          //实现文件的复制
            }
        }catch (IOException e){
            e.printStackTrace();
        }finally {
            try {


                fileInputStream.close();//文件流闭合
                fileOutputStream.close();
            }catch(IOException e){
                e.printStackTrace();
            }
        }

    }
}