Creating Threads.

Expected time required: 15 min

We are developing software that is sorting packages in an Amazon warehouse. We have a main thread in WarehouseApp that sends data on new deliveries to DeliveryManager. DeliveryManager currently is just a new class, but we are planning on adding deeper functionality to it, and so we need to update it to implement a Runnable interface in preparation for this.

The program currently gets a delivery that gets sent to DeliveryManager, which then sorts out the packages into incomingPackages and additionalProcessing lists. Each list then has its contents printed. The sorting and printing should happen in a new thread, which is started in a method in WarehouseApp called startDeliveryThread.

The steps that need to be completed are as follows:

1. Run WarehouseAppTest and save the output.
2. DeliveryManager needs a Runnable interface.
3. Complete the run() method in DeliveryManager so it handles the sorting and printing. The constructor of DeliveryManager should only initialize the lists.
4. In WarehouseApp, complete startDeliveryThread(), which starts up the thread. main should only contain the printout line and a call to startDeliveryThread().
5. Re-run WarehouseAppTest and verify that the new output matches the output from step 1.

HINTS: You may need to move around some method calls to have the output in step 5 match that of step 1.

• I don't know what code to move?