Java Date class topics

Each type of problem has a variety of ways to solve, everyone randomly divergent

Analyze the following requirements and implement them with code
1. Known date string: "2015-10-20", converts the date string to a Date object
2. Convert the Date object in (1) to the object of the Calendar class
3. Date of the day on which the change was obtained, and the day of the year
4. Input date string by keyboard, format (2015-10-20)
As input: 2015-10-20, Output "2015-October-20th is Tuesday, is the No. 293 day of 2015"

Java Date class topics