The Java.util.TreeSet.clear() method is used to remove all the elements from a TreeSet. Using the clear() method only clears all the element from the set and not deletes the set. In other words, we can say that the clear() method is used to only empty an existing TreeSet.
Parameters: The method does not take any parameter
Return Value: The function does not return anything.
Below program illustrates the use of Java.util.TreeSet.clear() method:
TreeSet: [4, Geeks, To, TreeSet, Welcome] After clearing TreeSet: 
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