Keywords are one the most important part of SEO work is that since keywords are what people look for when they type terms into a search engine. Website ranking on search engine is depends on having keywords. Webmasters always try to Select appropriate keyword phrases and place them in the most strategic locations, where there are maximum chances for the spiders of the search engines to read, crawl and index them.

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Keywords!

No, keywords do not have to be capitalized.

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You can find a list of Java keywords in the Wikipedia article "List of Java keywords". These keywords may not be used for variables or other user-defined names.