i need these two programs in java ,,

they are separate please do them if you know , if you do not know and will now answe my questions when am asking please leave it for one who is going to answer correct 100%

Exercise 2: Write a program called SumOfDigits that will calculate the sum of the digits of the positive integer number. The user should input one positive integer number, and the program should display the sum of its digits. The output of the program should be: Please input a positive integer number N: 2563 Sum of all digits of the number 2563 is: 16 Exercise 3: Write a program for the exercise 2 using recursion