Submission of work is easy if work is submitted alone.

DemoClass.java

package com.tutorials.vishal;

import com.tutorials.vishal.hierarchy.BaseWork;
import com.tutorials.vishal.hierarchy.RxWork;
import com.tutorials.vishal.hierarchy.Scheduler;

public class DemoClass {

    void driver() {
        BaseWork work = new BaseWork();
        RxWork rxWork = new RxWork();
        
        // We are able to submit all types of work. Yay!
        startJob(work); // Valid!
        startJob(rxWork); // Valid, polymorphism magic.
    }
    void startJob(BaseWork incomingWork) {
        // validate the work and submit. 
        Scheduler.submit(incomingWork);
    }
}