java读写文件

public class fileuse {

    public static void main(String[] args) throws Exception {
        // 目录
        File filepath = new File("");
        // 获取聚堆路径
        System.out.println("getAbsoluteFile:  " + filepath.getAbsoluteFile());
        // 判断是否为目录

        System.out.println("isDirectory:  " + filepath.isDirectory());

        // 创建目录
        File newdirect = new File(filepath.getAbsoluteFile(), "nd");
        newdirect.mkdirs();
        System.out.println("newdirect.getAbsolutePath:  " + newdirect.getAbsolutePath());
        // 删除目录
        newdirect.delete();
        // 读写文件
        try {
            BufferedWriter out = new BufferedWriter(new FileWriter("runoob.txt"));
            out.write("菜鸟教程:");
            out.append("dasd" + "n");
            // out.newLine();
            out.write("你好");
            out.flush();
            out.close();
            System.out.println("文件创建成功！");
            BufferedReader in = new BufferedReader(new FileReader("runoob.txt"));
            String str;
            while ((str = in.readLine()) != null) {

                System.out.println(str);
            }
            in.close();
        } catch (IOException e) {
        }
    }
}```