How to generate a star Triangle pattern using Java.

How to print a star triangle pattern using java. Pattern is something like this

            * ====> row 1
           * *
          *   *
         *     *
        * * * * *

it can be n number of rows and from second row onwards there is odd number of white spaces between 2 stars like, 1,3,5, and last row have all the stars each separated by one white space.

How do I proceed?