Here's the problem: You can't put objects that don't implement the Comparable interface inside a Tree(Map/Set); if you do, your code won't even compile. The underlying cause is simple; TreeMap attempts to sort the objects you add. Many common types, such as String, Integer, etc., already implement Comparable, so they will be sorted automatically and cause no problems.
It's quick, easy and you get access to all the articles on DevX.
This registration/login is to allow you to read articles on devx.com. Already a member?
To become a member of DevX.com create your Member Profile by completing the form below. Membership is free!
If you have a hot tip and we publish it, we'll pay you. However, due to accounting overhead we no longer pay $10 for a single tip submission. You must accumulate 10 acceptable tips to receive payment. Be sure to include a clear explanation of what the technique does and why it's useful. If it includes code, limit it to 20 lines if possible. Submit your tip here.
