how i can

You can use a for loop to iterate how many types you want the asterisk to be printed. Then on every iteration, print the asterisk on a new line.Or you can use recursion(Setting up a method to call itself as many times as needed or until you run out of memory)

http://onesearch.sun.com/search/onesearch/index.jsp?qt=print+star&charset=utf-8&col=community-all&rt=true&cs=false&y=0&x=0This question has been asked for many many times.You can find a lot of examples there.