读姓名写到学号后面

public class homework_write_and_read {

public static void main(String[] args) {

FileReader fr = null ;

String xuehao_str = null ;

FileWriter fw = null ;

try {

fr = new FileReader( "file_name.txt" ); // 把file_name.txt文件放在当前项目的根目录

BufferedReader br = new BufferedReader(fr);

do {

xuehao_str = br.readLine();

} while ((br.readLine()) != null );

fr.close();

br.close();

fw = new FileWriter( "file_xuehao.txt" , true ); // 把file_xuehao.txt文件放在当前项目的根目录

fw.append(xuehao_str);

fw.close();

} catch (FileNotFoundException e) {

System. out .println( " 找不到指定文件" );

} catch (IOException e) {

System. out .println( " 文件读取错误" );

}

}

}