package outputStream;import java.io.FileNotFoundException;import java.io.FileOutputStream;import java.io.IOException;import java.io.OutputStream;public class Demo {            public static void main(String[] args) {            writerFile();            // System.out.println("done");        }        public static void writerFile() {            OutputStream out  =null;                        try {                /**        追加    out = new FileOutputStream("e.txt",true);                 *                  */            out = new FileOutputStream("e.txt");            String str = "helloworldaaaaaaaaa";            byte [] bs = str.getBytes();//            out.write(bs);//        out.write(bs);       和下面一样            for(byte b:bs) {                out.write(b);                                                //System.out.print((char)b);            }            out.flush();            } catch (FileNotFoundException e) {                // TODO Auto-generated catch block                e.printStackTrace();            } catch (IOException e) {                // TODO Auto-generated catch block                e.printStackTrace();            }finally {                if(out!=null) {                    try {                        out.close();                    } catch (IOException e) {                        // TODO Auto-generated catch block                        e.printStackTrace();                    }                }            }        }}