in java

Problem 1 (10 points) (Find numbers divisible by 3 or 4 , but not both) Write a program that displays all the numbers from 100 to 200 , that are divisible by 3 or 4 , but not both. Problem 2 (20 points) (Sum the digits in an integer) Write a method that computes the sum of the digits in an integer. Use the following method header: public static int sumDigits (long n ) For example, sumDigits (234) returns 9(=2+3+4). (Hint: Use the \% operator to extract digits and the / operator to remove the extracted digit. For instance, to extract 4 from 234, use 234%10 (= 4 ). To remove 4 from 234, use 234/10 (=23). Use a loop to repeatedly extract and remove the digit until all the digits are extracted. Write a test program that prompts the user to enter an integer then displays the sum of all its digits. Problem 3 (20 points) (Occurrences of a specified character) Write a method that finds the number of occurrences of a specified character in a string using the following header: public static int count(string str, char a) For example, count("Welcome", 'e') returns 2. Write a test program that prompts the user to enter a string followed by a character then displays the number of occurrences of the character in the string