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Changing your YouTube video preview thumbnail

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To change preview thumbnail of your youtube video

Option 1

You can choose a thumbnail from the three options that youtube automatically generates 

Go to Video Manager by clicking on your username in the upper right corner.On the My Videos/Upload Page, click Edit for the corresponding video you'd like to change.Once you are on Edit Video Page you can choose from the three options provided by YouTube as highlighted in the screen grab below.
Option 2
If don't find any image suitable for your video in the options provided by YouTube then you can also add a "Custom Thumbnail" for your video. Please note you will be able to see this option only if your YouTube account is a verified account.
If you are already viewing the Custom Thumbnail option you can simply upload a image of your choice and set it as your video preview thumbnail.
P.S. I would recommend to keep 16:9 ratio as it's the most used in YouTube Players and previews
Once you have selected the preview image of you…

Making PDF files SEO friendly

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Are you trying to figure out a way to get search engines to drill down your online PDF files and improve its ranking? If that is the case then you have a reason to cheer up :), this post will guide you to follow few very basic steps to improve your PDFs online visibility.Best Practices in SEO for PDF filesSmartly name your PDFs - Typically, the PDF filename will become part of the URL, so give your document a good key-word rich filename. Set the PDF title - Yes, most of us just don't set PDF title properties, but the matter of fact is that the title tag is a huge ranking factor. To set title of a PDF file, open it in Adobe Acrobat or any other PDF creator and go to, File --> Properties Set the other document properties too - don't just ignore the other properties provide a good Subject (Description) and Keywords as you do it for your HTMLsPrefer text-based PDFs over image-dominated PDFsSet "alt" text for all the images - this will also increase the accessibilityTou…

Custom PagingNavigator for SEO friendly URL

Apache Wickets biggest strength is its focus on components - Among a very large set of components is PagingNavigator component. It is a Wicket Panel component to draw and maintain a complete page navigation. I found this component very useful but the only problem that compelled me to write my own CustomPagingNavigator is the wicket URLs that are being created by clicking the page links. 

The Java Part...
public class CustomPaginationLinksPanel<T> extends Panel{
private static final long serialVersionUID = 10002L;
/**Pageable List View to be displayed */
private PageableListView<T> mainView;
/** Max count of links  default  value = 5 */
private intlinksPerPage = 5;
/** Page Number currently visible */
private int currPgNum;
    /** first page number */
private intfirstNum;
/** last page number */
private intlastNum;
//Calculated on the basic of List size
private intmaxPages;
//Parameter name that will be displayed as a part of URL
private String PAGINATOR_PARAM_NAME = "pg";

private…

sorting a List containing Object[] elements

Problem Statement: How can we  sort a List containing Object[] elements?
The Solution: Ever wondered how to sort a list full of Object[]? The answer is to use a Comparator I have used an anonymous class which implements compare method to sort the List of Object[]
package example.collections;
import java.util.ArrayList; import java.util.Collections; import java.util.Comparator; import java.util.List;
publicclass Sorting {
publicstaticvoid main(String[] args) {               List<Object[]> list = new ArrayList<Object[]>();               list.add(new Object[]{123, "abc", 212});               list.add(new Object[]{423, "qwert", 2131});               list.add(new Object[]{656, "asda", 45});               list.add(