IO目录常用操作2

    //建立文件夹
        File f=new File("user");
        System.out.println(f.createNewFile());
        //建立文件
        File wj = new File("user.txt");
        File wj2=new File(".","user2.txt");
        System.out.println(wj.createNewFile());
        System.out.println(wj2.createNewFile());

        //删除文件
        if (f.exists()) f.delete();
        if (wj.exists()) wj.delete();
        if (wj2.exists()) wj2.delete();