GWT, GWT-Ext

• Setting Up GWT HOME - GWT-Ext
• Fundamentals - Google Web Toolkit - Google Code
• Introduction to GWT-Ext 2.0 - GWT-Ext

Log4J

• by Ashley J.S Mills

Core J2EE Patterns

• by java.sun.com

Interview Questions & Experience

Day 1 & 2

• Fibonacci implementation in recursion and without
• Pay attention to details when you ask to write a simple java method. Such as,
• Error handling and exception handling
• Performance of logic such as searching without use of API methods
• Validate run time exceptions that could occur
• When you ask to write a search or a similar code/logic, try NOT to use API methods. Because that's what they expect.

Core Java

• Inheritance and Polymorphism

String, StringBuffer and StringBuilder

String is immutable whereas StringBuffer and StringBuilder can change their values.

The only difference between StringBuffer and StringBuilder is that StringBuilder is unsynchronized whereas StringBuffer is synchronized. So when the application needs to be run only in a single thread then it is better to use StringBuilder. StringBuilder is more efficient than StringBuffer.

Criteria to choose among String, StringBuffer and StringBuilder

1. If your text is not going to change use a string Class because a String object is immutable.
2. If your text can change and will only be accessed from a single thread, use a StringBuilder because StringBuilder is unsynchronized.
3. If your text can changes, and will be accessed from multiple threads, use a StringBuffer because StringBuffer is synchronous.