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Skype: vnnvanhuong

Hi there! I'm Hương, a software engineer from Việt Nam. I love Java, Agile and anything related to Information Technology. Currently, I’m a full-time Java software developer at Axon Active Vietnam. This blog aims at sharing with you my experience at work, learning experience and so forth.

Usually a post is about a problem. I have my own opinions, you also have yours. Let's think the problem through and have some fun!

I am not good at English, if I have mistake in writing, please forgive me. ;)


  1. Bạn có thể add subscribe option trong website này để mình nhận được tin nhắn, email khi bạn post bài viết mới được không.

    Cám ơn bạn nhiều.


    1. Cảm ơn ý kiến của @Tuyen Nguyen nhé. Tôi đã thêm gadget "Follow by Email" vào site. Ngoài ra bạn cũng có thể dùng ;)

  2. A cài plug in hiển thị code cho dễ đọc vs a

    1. Thank bạn nhé! đang sử dụng Syntaxhighlighter, có thể bị vấn đề ở một số browser rồi, tôi kiểm tra lại xem sao. :(

    2. xem được rồi, mới xem profile linkedin thì ra là bằng tuổi -.-

  3. em cũng mới tập viết blog: Nếu được a ghé đọc góp ý với :D

  4. bạn có thể viết thêm các bài review về các framework hay công nghệ mới của java không , JSF mình thấy ít cty dùng lằm mặc dù nó là con đẻ của JAVA


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Small Changes to Java 7 via Project Coin and Why They are Useful

Did you know how new features were added into Java 7? The following are functionalities that can be considered.
Source: [1] Project Coin is all about the changes in the range from syntactic sugar to new language feature. This is what we're talking about today.

Since Java 7 is the first version developed in an open source manner, there is an amount of actions that must be performed for any changes as follows:
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Here are what I have learned from this exciting journey. 💪
Do not procrastinate I have had no experience of climbing a high mountain before. Then, I've sought advice from my friends, but they suggested that I should not make it at that time due to bad weather and lack of experience. I know it never come true unless I just make my decision. Can't wait! Prepare for your journey You firstly need getting to know about the journey, schedule, transportation, etc. Recommended sources: YouTube videos, blog posts and tour companies websites.
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Strategy Design Pattern

For example, I have an program with an Animal abstract class and two sub-classes Dog and Bird. I want to add a new behavior for the class Animal, this is "fly".  Now, I face to two approaches to solve this issue:

1. Adding an abstract method "fly" into the class Animal. Then, I force the sub-classes should be implemented this method, something like:

public abstract class Animal{ //bla bla public abstract void fly(); } public class Bird extends Animal{ //bla bla public void fly(){ System.out.println("Fly high"); } } public class Dog extends Animal{ //bla bla public void fly(){ System.out.println("Cant fly"); } }
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Java Core - Top 10 Questions Every Developer Should Know


What is the difference between Javascript and Java?Difference between StringBuilder and StringBuffer?Why do I get "SomeType@a3fde" when I print my code?Why is String immutable?Why "equals" method when we have "==" operator?Is List<Dog> a subclass of List<Animal>?Why shouldn't we use raw type?Is Java “pass-by-reference” or “pass-by-value”?What's the advantage of a Java enum versus a class with public static final fields?Why "double x = 0.1 + 0.2" and result of print(x) is 0.30000000000000004?
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"Java and Javascript are similar like Car and Carpet are similar." - Greg Hewgill (on StackOverflow)
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