Can we add heterogeneous elements into TreeMap ?

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 Q1. Can we add heterogeneous elements into TreeMap ?
Ans. No, Sorted collections don't allow addition of heterogeneous elements as they are not comparable.

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   Like         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 ?

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