How to sort TreeSet in descending order in Java?
Given a TreeSet in Java, task is to sort elements of TreeSet in Descending Order (descreasing order).
Examples:
Input : Set: [2, 3, 5, 7, 10, 20] Output : Set: [20, 10, 7, 5, 3, 2] Input : Set: [computer, for, geeks, hello] Output : Set: [hello, geeks, for, computer]
Approach:
To make a TreeSet Element in decreasing order, simple use descendingSet() method which is used to change the order of TreeSet in reverse order
Below is the implementation of the above approach:
Java
// Java Program to print TreeSet in reverse Orderimport java.util.TreeSet;public class TreeSetDescending{ public static void main(String[] args) { // Declare a treeset TreeSet<Object> ints = new TreeSet<Object>(); ints.add(2); ints.add(20); ints.add(10); ints.add(5); ints.add(7); ints.add(3); // Initialize treeset with // predefined set in reverse order // using descendingSet() TreeSet<Object> intsReverse = (TreeSet<Object>)ints.descendingSet(); // Print the set System.out.println("Without descendingSet(): " + ints); System.out.println("With descendingSet(): " + intsReverse); }} |
Output
Without descendingSet(): [2, 3, 5, 7, 10, 20] With descendingSet(): [20, 10, 7, 5, 3, 2]
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