Hadoop: The difference between jobconf and job objects

1142270 pts.
Tags:
Big Data
Hadoop
I'm currently working in Hadoop but I'm having difficulty finding the difference between jobconf and job objects. This is how I'm submitting my job as of today:
JobClient.runJob(jobconf);
But then my friend send me this for submitting jobs:
Configuration conf = getConf();
Job job = new Job(conf, "secondary sort");
job.waitForCompletion(true);     
return 0;
So is there a way I can specify the sortcomparator class for the job using jobconf? Thank you!
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