/*  

* 对已有文件的数据续写

 */ import java.io.*;

public class FileWriterDemo3

     {  

            public static void main(String[] args) throws IOException  

                     {  

                          //   传递一个true参数，代表不覆盖已有的文件，并在已有文件的末尾处进行数据续写

                         FileWriter fw=new FileWriter("demo.txt",true);  

                         fw.write("nihaoxiexie");  

                         //fw.write("nihao\r\nxiexie");//进行换行：xiexie换在下一行  

                         fw.close();

                       }

}