How to sort a TreeSet in descending order in Java?

Given a TreeSet in Java, the task is to sort the elements of the TreeSet in descending order (decreasing order).

Example:

输入: Set: [2, 3, 5, 7, 10, 20]
输出: Set: [20, 10, 7, 5, 3, 2]

输入: Set: [computer, for, geeks, hello]
输出: Set: [hello, geeks, for, computer]

Method:

To generate TreeSet elements in order, just use the descendingSet() method, which is used to change in reverse order The order of TreeSet

The following is the implementation of the above method:

import java.util.TreeSet; 
  
public class TreeSetDescending { 
  
    public static void main(String[] args) 
    { 
        // 声明一个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); 
  
        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(): [computer, for, geeks, hello]
With descendingSet(): [hello, geeks, for, computer]

Related recommendations: "Java Tutorial 》

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