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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
" + treeSet);
TreeSet<Object> res = (TreeSet<Object>)treeSet.descendingSet();
System.out.println("TreeSet after sorting in descending order
" + 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]
Updated on: 20-Sep-2019
8K+ Views
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