案例：复制Java文件（打印流改进版）

public class CopyJavaDemo {
    public static void main(String[] args)throws IOException {
        /*
        //根据数据源创建字符输入流对象
        BufferedReader br = new BufferedReader(new FileReader("myFile\\PrintStream.java"));

        //根据目的地创建字符输出流对象
        BufferedWriter bw = new BufferedWriter(new FileWriter("myFile\\Copy.java"));

        //读写数据，复制文件
        String line;
        while ((line=br.readLine())!=null){
            bw.write(line);
            bw.newLine();
            bw.flush();
        }

        //释放资源
        br.close();
        bw.close();
         */

        //使用打印流改进
        BufferedReader br = new BufferedReader(new FileReader("myFile\\PrintStreamDemo.java"));

        PrintWriter pw = new PrintWriter(new FileWriter("myFile\\Copy.java",true));

        //读写数据，复制文件
        String line;
        while ((line=br.readLine())!=null){
            pw.println(line);
        }

        br.close();
        pw.close();
    }
}

运行结果：