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How to sort TreeSet in descending order in Java?
To sort TreeSet in descending order, use the descendingSet() method in Java.
The descendingSet() method is used to return a reverse order view of the elements contained in this set.
At first, create a TreeSet −
TreeSet<Object> treeSet = new TreeSet<Object>();
Then add some elements −
treeSet.add(45); treeSet.add(15); treeSet.add(99); treeSet.add(70);
Sort them indecreasing order −
TreeSet<Object> res = (TreeSet<Object>)treeSet.descendingSet();
Following is the code to sort TreeSet in descending order −
Example
import java.util.TreeSet; public class Main { public static void main(String[] args) { TreeSet<Object> treeSet = new TreeSet<Object>(); treeSet.add(45); treeSet.add(15); treeSet.add(99); treeSet.add(70); treeSet.add(65); treeSet.add(30); treeSet.add(10); treeSet.add(60); treeSet.add(80); System.out.println("TreeSet\n" + treeSet); TreeSet<Object> res = (TreeSet<Object>)treeSet.descendingSet(); System.out.println("TreeSet after sorting in descending order\n" + res); } }
Output
TreeSet [10, 15, 30, 45, 60, 65, 70, 80, 99] TreeSet after sorting in descending order [99, 80, 70, 65, 60, 45, 30, 15, 10]
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