import java.io.*;public class FileOutputStreamTest {    public static void main(String[] args){        FileOutputStream fos=null;        try {            fos=new FileOutputStream("d:\\myDoc\\hello.txt",true);            String str="好好学习Java";            byte[] words=str.getBytes();            fos.write(words,0,words.length);            System.out.println("hello文件已更新");        } catch (FileNotFoundException e) {            e.printStackTrace();        } catch (IOException e) {            System.out.println("文件更新时出错！");            e.printStackTrace();        }finally{            try {                if(fos!=null){                    fos.close();                }            } catch (IOException e) {                e.printStackTrace();            }        }    }}