i need a java

E5,7 Write a method public static int countwords (String str) that returns a count of all words in the string str. Words are separated by spaces. For example, countwords ("Mary had a little 1amb") should return 5. Your method should work find the position of the next space following a given position, and the position of the next non-space character following a given position. correctly if there are multiple spaces between words. Use helper methods to