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我们在学习的过程中可以形成自己的代码库，即将一些常用的类，函数，接口，配置文件等单独拎出来，下次使用时直接复制过来，这样就可以重复造轮子，早点下班回家。

java NIO是一个高效的处理文件的API, 比传统文件流要高效许多。

public class MyFileTools {        public void copyFile(String inFile,String outFile,boolean tail){        FileInputStream fin = null;        FileOutputStream fout = null;                FileChannel fcin = null;        FileChannel fcout = null;                try {            fin = new FileInputStream(inFile);            fout = new FileOutputStream(outFile,tail);                        fcin = fin.getChannel();            fcout = fout.getChannel();                        ByteBuffer buffer = ByteBuffer.allocate(1024);            while(true){                buffer.clear();                int read = fcin.read(buffer);                if(read == -1){                    break;                }                buffer.flip();                fcout.write(buffer);                            }                    } catch (FileNotFoundException e) {            e.printStackTrace();        } catch (IOException e) {            e.printStackTrace();        }finally{            if(fcin != null){                try {                    fcin.close();                } catch (IOException e) {                    e.printStackTrace();                }            }            if(fcout != null){                try {                    fcout.close();                } catch (IOException e) {                    e.printStackTrace();                }            }        }    }        public static void main(String[] args){        MyFileTools mft = new MyFileTools();        mft.copyFile("/sandbox-local/rding/HelloCopy.py", "/sandbox-local/rding/HelloPython2.py",true);            }}