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| Ans. No, Sorted collections don't allow addition of heterogeneous elements as they are not comparable. | ||||
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 Discuss Correct / Improve  java collections comparable interface treemap | ||||
 Related Questions | ||||
 What is Comparable Interface? | ||||
| How TreeMap orders the elements if the Key is a String ? | ||||
| Will it create any problem if We add elements with key as user defined object into the TreeMap ? | ||||
| Where do we generally use comparable interface ? | ||||
