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Display a TreeSet in reverse order in Java
To display a TreeSet in reverse order, you need to use Comparator. Let us first create an Integer array and use it for the TreeSet elements:
Integer arr[] = { 25, 100, 125, 200, 250, 400, 450, 550, 600, 700};
Now, use reverseOrde() comparator to reverse the natural ordering:
Set<Integer> set = new TreeSet<Integer>(Collections.reverseOrder());
Now, add individual elements of the set as the Integer array elements:
for (int i = 0, l = arr.length; i < l; i++) { set.add(arr[i]); }
Example
import java.util.Collections; import java.util.Set; import java.util.TreeSet; public class Demo { public static void main(String args[]) throws Exception { Integer arr[] = { 25, 100, 125, 200, 250, 400, 450, 550, 600, 700}; Set<Integer> set = new TreeSet<Integer>(Collections.reverseOrder()); for (int i = 0, l = arr.length; i < l; i++) { set.add(arr[i]); } System.out.println("TreeSet (Reverse order) = "+set); } }
Output
TreeSet (Reverse order) = [700, 600, 550, 450, 400, 250, 200, 125, 100, 25]
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