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Remove all elements from TreeSet in Java
Use the clear() method to remove all elements from TreeSet.
First, create a TreeSet and add elements −
TreeSet<String> set = new TreeSet<String>(); set.add("65"); set.add("45"); set.add("19"); set.add("27"); set.add("89"); set.add("57");
Now, remove all the elements −
set.clear();
The following is an example to remove all elements from TreeSet −
Example
import java.util.*; public class Demo { public static void main(String args[]){ TreeSet<String> set = new TreeSet<String>(); set.add("65"); set.add("45"); set.add("19"); set.add("27"); set.add("89"); set.add("57"); System.out.println("TreeSet elements..."); Iterator<String> i = set.iterator(); while(i.hasNext()) { System.out.println(i.next()); } set.clear(); System.out.println("Updated TreeSet elements..."); System.out.println(set); } }
Output
TreeSet elements... 19 27 45 57 65 89 Updated TreeSet elements... []
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