Friday, July 27, 2018

Does Oracle's Java Certifications like OCAJP, OCEJWCD, or OCPJP helps in Job and Career?

Being the author of a Java blog and a certified Java programmer, I receive lots of questions about the usefulness of Java certifications like SCJP, now known as OCJP or OCPJP. Questions like, does getting a Java Certification helps to land a job, or does certified Java developer earn more or gets better offers, are quite common to Java developers, especially freshers. In this post, I will try to answer a few of these question based on my own experience as a Java blogger and a certified Java developer. Well, I did my first Java Certification, SCJP (Sun Certification for Java Programmers) along back when SCJP 1.4 was hot and after scoring 100% on that I did two more Java certifications i.e. my SCWCD (Sun Certification for Web Component Developer) and SCMAD (Sun Certified Mobile Application Developer). 

Thursday, July 26, 2018

How to do Pagination in Oracle Database - SQL Query With Example

Many time we need SQL query which returns data page by page i.e. 30 or 40 records at a time, which can be specified as page size. In fact, Database pagination is a common requirement of Java web developers, especially dealing with the largest data sets.  In this article, we will see how to query Oracle 10g database for pagination or how to retrieve data using paging from Oracle. Many Java programmer also uses display tag for paging in JSP which supports both internal and external paging. In case of internal paging, all data is loaded into memory in one shot and display tag handles pagination based upon page size but it only suitable for small data where you can afford those many objects in memory.

Wednesday, July 25, 2018

2 Books to Prepare Oracle Java Certification Exams - OCA and OCP Java SE 6,7, 8 OCPJP 8

There was a time when Sun Certification was very hot and programmers feel proud of being Sun Certified Java Professional(SCJP). After Oracle took over Sun in early 2010, it changed names of all the examination from SCJP to OCPJP or OCJP, and now OCA and OCP for Java SE 7 and Java SE 8. I see there is a lot of confusion among certification nowadays, but essentially they are of the same level at previous SCJP. Since Java gets new language features with every new release, subsequently a new certification title is introduced. I am not agreed with upgrading your Java certification with every release, it doesn't make much sense to me, but many programmers prefer to get certified and keep it updated.