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week 11 Assignment

Example code to look at:

  1. Date and Calendar example code
  2. Compare using comparator class
  3. Compare using comparable interface on the things you are comparing
  4. Example of secondary sort on an object using compartor

Part 1: Dates, Calendar, and DateFormatter.

For this part please use the Date Format mask:

"yyyy-MM-dd HH:mm:ss Z"
  1. Print the current date (just do new Date()) using the above format mask (use SimpleDateFormat).
  2. Use the GregorianCalender to set the date to one month, one day, and one hour ago. Print this date out.
  3. Read in a timestamp from the user (use Scanner, it will be a long, so use .nextLong()). Create a Date Object from this, and print it out formatted, with the above format mask.

Note: Date class has a constructor that takes a timestamp. So you can do a thing like this:

long timestamp = scanner.nextLong();
Date usersDate = new Date(timestamp);

Part 2: Comparables

  1. Create a class called Lizard. If should have 2 attributes:
    public String name;
    public float age; // in years.
  1. Implement Comparable on the Lizard. You must compare it to another Lizard (see Cat.java for clues).
  2. In the compareTo() method you implement on lizard do the following:
  3. Primary Sort by name (Ascending)
  4. Secondary Sort by age (Ascending)
  5. Make another class, and use it to create 10 lizards. Some of them must have the SAME NAME, but DIFFERENT AGES. We are going to use this learn how to do a secondary sort. Add all of the Lizards to a single List<Lizard>.
  6. Print out the unsorted list. The toString() on Lizard MUST display the name and age.
  7. Call Collections.sort() on the list of Lizards.
  8. Print out the sorted list. Your lizards must be sorted in Ascending order by name. Your lizards that had the same name must be secondarily sorted by AGE!

Grading

Part 1 is worth 30 points. Part 2 is worth 70 points. Please see the example code, there will be examples of how to do everything you need to do. Your job is to understand it and put it all together.