Java programming. please do not use the array to solve this problem. otherwise, i have to repost it again. thanks

P5.7 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 P5.8 It is a well-known phenomenon that most people are easily able to read a text whose words have two characters flipped, provided the first and last letter of each word are not changed. For example, I dn'ot gvie a dman for a man taht can olny sepll a wrod one way. (Mrak Taiwn) Write a method String scramble (String word) that constructs a scrambled version of a given word, randomly flipping two c write a program that reads words haracters other than the first and last one. Then and prints the scrambled words P5.9 Write methods public static double sphereVolume (double r) public static double sphereSurface (double r) public static double cylinderVolume (double r, double h) public static double cylinderSurface(double r, double h) public static double coneVolume (double r, double h) public static double coneSurface(double r, double h) that compute the volume and surface area of a sphere with radius r, a cylinder with a circular base with radius r and height h, and a cone with a circular base with radius r and height h. Then write a program that prompts the user for the values of r and h, calls the six methods, and prints the results