从localhost在远程hdfs上创建一个目录
写了代码但不明白该写什么和在哪里写 core-site.xml 以及 hdfs-site.xml .

public class HadoopCall {
    public void demomkdir(String dir) throws IOException
    {
        Configuration obj = new Configuration();
        obj.set("fs.defaultFS", "http://datlpdsnn01.pds.in.****.com:50070/");
        FileSystem fs = FileSystem.get(obj);
        Path pth = new Path(dir);
        fs.mkdirs(pth);
        System.out.println("created");
        fs.close(); 
    }
    public static void main(String[] args) throws IOException {
        HadoopCall oj = new HadoopCall();
        oj.demomkdir("user/*******/javacodemkdir");
    }
}