public class BufferedWriterDemo throws IOException {

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

          // 创建流对象

        BufferedWriter bw = new BufferedWriter(new FileWriter("out.txt"));

          // 写出数据

        bw.write("hello");

          // 写出换行

        bw.newLine();

        bw.write("world");

        bw.newLine();

        bw.write("!");

        bw.newLine();

        // 释放资源

        bw.close();

    }

}