Part I Write a method that takes two parameters: integer n, char operation. If the given operation parameter is '+', then sum all numbers until n, otherwise multiply all numbers until n. Part II Write...

Extracted text: Part I Write a method that takes two parameters: integer n, char operation. If the given operation parameter is '+', then sum all numbers until n, otherwise multiply all numbers until n. Part II Write a method that prints a menu as given below and asks the user to input a value. If the value given by user is 'r' then repeat the menu. If the value given by user is 'e' then stop the code. [r]epeat menu [e]xit Enter an option: Part III Write a method that takes four integer parameters: æl, y1, x2 and y2. The method calcu- lates the distance between two points which theirs coordinate are given by the parameters. Note: Do not compress your files, submit only java files. Note: Do not forget to justify your answers with comments.