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03: Scenarios based Java OO concepts & GoF design patterns – Strategy Pattern

The following post improves on the design flaws listed in the previous post entitled 02: Scenarios based Java OO design & GoF design patterns – naive Template Method pattern. Scenario: A company named XYZ Retail is in the business of selling Books, CDs and Cosmetics. Books are sales tax exempt…...

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Posted in Designing your classes & interfaces, member-paid

02: Scenarios based Java OO concepts & GoF design patterns – naive Template Method pattern

Extends Can you design classes & interfaces using OO?. Only experience, and asking the right questions can teach you what design pattern to use, in which scenario. Scenario: A company named XYZ Retail is in the business of selling Books, CDs and Cosmetics. Books are sales tax exempt and CDs

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Posted in Designing your classes & interfaces

13: Atomicity, Visibility, & synchronization in Java

Q. Given the following code, Client

Service interface & implementation

the line “XXX expensive call to a legacy system” in the “ServiceImpl” is an external call to a legacy system, which breaks when more than 5 concurrent calls are made. In other words, the “SLA (i.e. Service…...

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Posted in ♦ Complete the given code, member-paid

12: Complete the trades matching logic

Q. Given the following code

Fill in required code in the “//********** TO BE COMPLETED *************” section within the “match(Trade trade)” method and in the variables declaration section at the top. Assume that this object is only accessed by a single thread. The requirements are 1) Two trades can…...

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Posted in ♦ Complete the given code, member-paid

11: Threads performing tasks by talking to each other

Q. Given the following code

Output:

Complete the above code so that it prints a=1 and b=1 interleaved.

A. The solution is to have inter thread communication between both threads. One thread executes the method workOnX() on the shared object “SharedObject”, and the other thread invokes

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Posted in ♦ Complete the given code

4b. FP approach 10-digit phone number to produce a list of words matching first letters of the phone number

This makes use of the Functional Programming (FP) approach. Q: Write a program that takes any 10-digit phone number and produces a list of words matching first letters of the phone number (2 – ABC, 3 – DEF, .. 9 – WXYZ). Use any free word list file from online.…...

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Posted in member-paid, Writing Code Home Assignements

4a. 10-digit phone number to produce a list of words matching first letters of the phone number

Q: Write a program that takes any 10-digit phone number and produces a list of words matching first letters of the phone number (2 – ABC, 3 – DEF, .. 9 – WXYZ). Use any free word list file from online. A: The logic is to 1) Read a word…...

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Posted in member-paid, Writing Code Home Assignements

3. Multi-Threading – Create a simple framework where work items can be submitted

Q: Create a simple framework where work items can be submitted using Java 8 or later. Here are the use cases: #1: A work item is an instance of a class. #2: The definition of “parallelism” controls how many threads are created to execute the work items in parallel (aka…...

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Posted in member-paid, Reactive Programming, Writing Code Home Assignements
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