Answer: Is there any API in Java to access wikipedia data

You can use Jwiki to get Wikipedia data Example :

Jwiki jwiki = new Jwiki("elon musk");
System.out.println("Title :"+jwiki.getDisplayTitle()); //get title
System.out.println("Text : "+jwiki.getExtractText());  //get summary text
System.out.println("Image : "+jwiki.getImageURL());    //get image URL