SortNames output

[K. Tsang]

Hello all, I'm just wondering what's the correct output to OOP3 (SortNames)? I got the following using ArrayList:

[Abraham Lincoln, Adam Baum, Bill Joy, Connie Chung, James Gosling, Joe Montana, Justin Case, Walter Cronkite]

Or is it something else? Thanks

[Pauline McNamara]

Hello K,

From the instructions, the output should be "Show the names sorted in order of first name and then by last name."

It looks like you got a list of names sorted by first name. Sorting by last name may be a bit trickier...


Happy coding,
Pauline

[K. Tsang]

For the sort by last name output, does the name needs to be "firstname lastname"? Because, I swapped the 2 and sorted it. But not sure if the output needs to be reversed for each name.

Also when I compile my program, I got a note saying the program uses unchecked or unafe operations, recompile with -Xlint:unchecked for details. When I do recompile, it warns about my ArrayList.add and Collections.sort: ArrayList.add(<some string>) and Collection.sort(<some arraylist>). According to the API, ArrayList.add(Element) and Collections.sort(List<T>).

This makes me wonder isn't an arraylist a list and can string be element? If not to either, how to ensure it is a list or element respectively? casting? Any help on this is appreciated. Thanks

[Marilyn de Queiroz]

For the sort by last name output, does the name needs to be "firstname lastname"? Because, I swapped the 2 and sorted it. But not sure if the output needs to be reversed for each name.

The output should be "firstname lastname". You should not change the list or create a new list to get the correct output.

Also when I compile my program, I got a note saying the program uses unchecked or unafe operations, recompile with -Xlint:unchecked for details. When I do recompile, it warns about my ArrayList.add and Collections.sort: ArrayList.add(<some string>) and Collection.sort(<some arraylist>). According to the API, ArrayList.add(Element) and Collections.sort(List<T>).

This makes me wonder isn't an arraylist a list and can string be element? If not to either, how to ensure it is a list or element respectively? casting?

If you only got warnings, but were able to compile and run the class, you don't need to worry. The warnings were added in jdk-5 for jdk-5-specific syntax.