Programming Tips for JDBC a. Use DataSource whenever Possible If you have a choice, you always should use javax.sql.DataSource to get a JDBC connection. Data sources, which were introduced with JDBC 2.0, make the job of configuring a database connection and connecting to a database nearly fool proof. Consider the following Read more…
JavaScript DOs and DONTs 1. Use Shortcut Notations: This code [Avoid] Is the same as [Use Instead] var lunch = new Array(); lunch[0]=’Dosa’; lunch[1]=’Roti’; lunch[2]=’Rice’; lunch[3]=’what the heck is this?’; var lunch = [ ‘Dosa’, ‘Roti’, ‘Rice’, ‘what the heck is this?’ ]; Read more…
Do not use the test-case constructor to set up a test case [Junit] Context: Setting up a test case in the constructor is not a good idea. Consider: public class SomeTest extends TestCase public SomeTest (String testName) { super (testName); // Perform test set-up Read more…
Tips for Swing UI Layout 1. Avoid using JEditorPane and JTextPane: Most Swing components in Java 6 have a meaningful baseline. However, some seem to have no correct baseline (for no apparent good reason). JEditorPane and JTextPane are examples of such components. This means that it is impossible to Read more…
How to improve client-side EJB lookup code Context: Typical EJB applications make use of a client layer that invokes one or many EJBs several times. This is true for many web applications as well. When a client layer must use a particular bean multiple times, there needs to Read more…
Best Practices for Multithreading in Java 1. Synchronization: If you have shared mutable data, synchronize access to it. Synchronization makes sure that an object is seen only in a consistent state by any thread, as it ensures mutual exclusion. It also guarantees reliable communication between threads as it ensures Read more…
Character encoding in Java Java iterates through all the characters that the string represents and turns each one into a number of bytes and finally put the bytes together. The rule that maps each Unicode character into a byte array is called a character encoding. So it’s possible Read more…
‘Return zero-length arrays, not nulls’ Some APIs intentionally return a null reference to indicate that instances are unavailable. This practice can lead to denial-of-service vulnerabilities when the client code fails to explicitly handle the null return value case. For methods that return a set of values using an Read more…
Consider Static Factory Methods instead of Constructors The normal way for a client to obtain an instance of itself is to provide a public constructor. But apart from this there is another technique which should be the part of every programmer’s toolkit. A class can provide a static factory Read more…
a. Always try to avoid generating garbage, because this will reduce the need to run a garbage collection. Just think about three things: 1.Reuse existing objects 2.Avoid creating unnecessary objects 3.Create object pools (Use Object Pool only when object creation is very expensive like threads Read more…