for java program two programs

Exercise 5: Write a recursive method public static void writeVertical(int n) that takes one non-negative integer and displays that integer with the digits going down the screen one per line. For example, the invocation writeVertical(1234) would produce the output Write a main method that prompts the user to enter a positive integer n and displays as above. Exercise 6: Write a recursive method public static int squares(int n) that takes one non-negative integer and displays the sum of squares of all integers up to n. For example, squares(4) should display the value of the sum 122+32 +42 Write a main method that prompts the user to enter a positive integer n and displays as above