Effective Learning (& Teaching)

Effective Learning
(& Teaching)
Sharafat Ibn Mollah Mosharraf
Software Engineer,
Therap (BD) Ltd.
sharafat@therapservices.net

The WH-Questions for Learning
● Why
● What
● How
● Where
● When

Effective Learning (& Teaching) 1 / 17

The WH-Questions for Learning...
● Why
1. Why do we have to learn this?
● What
2. What is it?
4. What are the other available options?
● How
3. How does it work?
5. How is it different (as well as better / worse) than
the other available options?
● Where
6.1. Where should this be used?
● When
6.2. When should this be used?

Example Learning Object
● Java synchronized keyword
● Example usage of synchronized keyword:
public class SynchronizedCounter {
private int c = 0;

public synchronized void increment() {
c++;
}

public synchronized void decrement() {
c--;
}

public synchronized int value() {
return c;
}
}

The Why Part
● Why
Answer: Understand Race condition.

public class UnsynchronizedCounter {
private int c = 0;

public void increment() {
c++;
}

public void decrement() {
c--;
}

public int value() {
return c;
}
}


The What Part - 1st Question
● Why
● What
2. What is it? public class SynchronizedCounter {
private int c = 0;

Answer: Putting the public synchronized void increment() {
c++;
synchronized keyword }
before the method public synchronized void decrement() {
name prevents }
c--;

concurrent access to
the method. return c;
}
}


The How Part - 1st Question
● Why
● What
2. What is it?
● How private int c = 0;

3. How does it work? public synchronized void increment() {
c++;
}
Answer: Understand the
intricacies of locking. c--;
}

return c;
}
}


The What Part - 2nd Question
● Why
● What
2. What is it?
● How

Answer: Can't we put the synchronized keyword before the class
name or even just a block of statements?
public synchronized class SynchronizedCounter { public void do() {
private int c = 0;
//some statements
public void increment() { synchronized {
c++; //a few statements
}
}
public void decrement() { //some more statements
c--;
} }
}

The How Part - 2nd Question
● Why
● What
2. What is it?
● How

Answer: Understand how method synchronization is
better than class synchronization but worse than
synchronizing group of statements.

The How Part - 2nd Question...
Method Synchronization
private int c = 0;

public synchronized void increment() {
c++;
}

c--;
}
}

Class Synchronization Statement Block Synchronization
public synchronized class SynchronizedCounter { public void do() {
private int c = 0;
//some log statements
public void increment() { synchronized {
c++; //a few statements
} }
public void decrement() { //some activity publishing statements
c--; }
}
}

The Where Part
● Why
● What
2. What is it?
● How
● Where

Answer: To the part of code where concurrent access might occur.


The When Part
● Why
● What
2. What is it?
● How
● Where
● When
Answer: Understand when to use method level and block level
synchronization.

The Common Part
● Why
● What
2. What is it?
● How
● Where
● When

Characteristics of an Example
● Precise, to the point
○ The more useless information you get, the more
your chance of missing the actual point.
● Concise
○ Lengthy examples make one feel sleepy...
● Must be based on something the audience is
familiar with
○ Surely you don't want to have the 'Rover Robot' as
an example of an object!
● Easy-to-understand
○ It's the ultimate outcome of the above points.


Effective Teaching (Problem-Solving Style)
[Don't confuse with Gangnam Style!!]

When teaching a new topic,
● Start with something the audience is familiar
with.
● Point out its limitations, failure cases etc.
○ Make sure to clearly identify the root cause of
limitation/failure.
● Discuss possible solutions for overcoming
the root cause and thus the limitations.
● Discuss the difference of the various
solutions, their shortcomings, remedy and so
on.

Effective Memorization
● Find out why something is named as it's
named.
○ Knowing the justification for naming something helps
memorize about what it means or does.
● Know the subtle differences (if exists) among
similar things / terminologies.
○ For example, the difference between function
parameter and function argument.
○ This also enables one to use appropriate term in
appropriate places.


Learning / Teaching the Big Picture
● Know the ultimate goal / target / objective.
● Know why that should be learnt.
● Know a shallow overview of the steps.
● Start learning a step in details, following the
approach discussed in this presentation.
● When moving to the next step, know why
you need to move to it and why you
shouldn't move to other available steps
before this one. (i.e., know the link between
steps)

Learning Languages / Frameworks
● Method 1
○ Read all topics in depth
○ Take a big project and implement it.
● Method 2
○ Read a topic in depth
○ Implement it in code
○ Progress...
● Method 3
○ Read all topics in short (i.e., knowing what topics are
available, what they mean and why do you need
those).
○ Take a big project but start it small.
○ While implementing each part, learn it in depth.

Effective Learning (& Teaching)

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