ArrayList sorting

[Tom Lee]

Hi all,
My question is regarding ArrayList sorting. Assume I have Employee object with two attributes 1.empName 2.empSalary. I have added 100 Employee objects in a Arraylist. Now I want to sort the arraylist according to empName. How would I achieve this?

Any help would be appreciated.

Thanks and Regards,
Tom Lee

[Manuel Leiria]

Originally posted by Tom Lee:
Hi all,
My question is regarding ArrayList sorting. Assume I have Employee object with two attributes 1.empName 2.empSalary. I have added 100 Employee objects in a Arraylist. Now I want to sort the arraylist according to empName. How would I achieve this?

Any help would be appreciated.

Thanks and Regards,
Tom Lee

If you want to sort the Employee class only by empName, make your class implement the interface Comparable but if you want to use more then one criteria (e.g., first sort by empName and then sort by empSalary) you'll need two comparators. In this case, you must create two new classes and make them implement the interface Comparator.

Manuel Leiria

[Tom Lee]

Hi,
I want to sort the Employees by their names only. Can you explain me with help of any example/program ???

Thanks in advance,
Tom Lee

[Manuel Leiria]

Ok, so for a start, check the API

http://java.sun.com/j2se/1.4.2/docs/api/java/lang/Comparable.html

and then, check this tutorial,

http://www.onjava.com/pub/a/onjava/2003/03/12/java_comp.html