printWriter 缓存字符输出流

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

FileOutputStream fos = new FileOutputStream("pw.txt");

OutputStreamWriter osw = new OutputStreamWriter(fos,"UTF-8");

/**

* 创建具有自动行刷新的PrintWriter后，

* 每当我们用printWriter写出字符串后，

* 都会自动flush

* 但一定要清楚：会添加次数，降低效率

*/

PrintWriter pw = new PrintWriter(osw,true);

pw.println("Think in java");

pw.println("come on ");

pw.close();

}