Java에서 역순으로 TreeMap을 반복합니다.

import java.util.*;
public class Example1 {
   public static void main(String[] args) {
      // creating a TreeMap 
      TreeMap<String, Integer> TrMap = new TreeMap<>();
      // Adding elements in the map
      TrMap.put("Backpack", 4000);
      TrMap.put("Desktop", 3000);
      TrMap.put("Keypad", 1500);
      TrMap.put("Watch", 2000);
      TrMap.put("Pen drive", 2500);
      // storing the elements of the map in descending order
      Map<String, Integer> newMap = TrMap.descendingMap();
      // printing the details of map 
      System.out.println("Elements of the map in Reverse Order: ");
      // iterating through the map
      for (String unKey : newMap.keySet()) {
         // printing details of map in reverse order
         System.out.println("Item: " + unKey + ", Price: " + newMap.get(unKey));
      }
   }
}

Elements of the map in Reverse Order: 
Item: Watch, Price: 2000
Item: Pen drive, Price: 2500
Item: Keypad, Price: 1500
Item: Desktop, Price: 3000
Item: Backpack, Price: 4000

import java.util.*;
public class Example2 {
   public static void main(String[] args) {
      // creating a TreeMap 
      TreeMap<Integer, String> TrMap = new TreeMap<>();
      // Adding elements in the map
      TrMap.put(40, "Backpack");
      TrMap.put(12, "Desktop");
      TrMap.put(150, "Keypad");
      TrMap.put(125, "Watch");
      TrMap.put(250, "Pen drive");
      // retrieving the keys in reverse order
      Set<Integer> keys = TrMap.descendingKeySet();
      // printing the details of map 
      System.out.println("Elements of the map in Reverse Order: ");
      // iterating through the map
      for (Integer unKey : keys) {
         // printing details of map in reverse order
         System.out.println("Item: " + TrMap.get(unKey) + ", Quantity: " + unKey);
      }
   }
}

Elements of the map in Reverse Order: 
Item: Pen drive, Quantity: 250
Item: Keypad, Quantity: 150
Item: Watch, Quantity: 125
Item: Backpack, Quantity: 40
Item: Desktop, Quantity: 12

import java.util.*;
public class Example3 {
   public static void main(String[] args) {
      // creating a TreeMap by passing Collections.reverseOrder() 
      TreeMap<String, Integer> TrMap = new TreeMap<>(Collections.reverseOrder());
      // Adding elements in the map
      TrMap.put("Kurti", 4000);
      TrMap.put("Shirt", 3000);
      TrMap.put("TShirt", 1500);
      TrMap.put("Watch", 2000);
      TrMap.put("Perfume", 2500);
      // printing the details of map 
      System.out.println("Elements of the map in Reverse Order: ");
      // iterating through the map
      for (String unKey : TrMap.keySet()) {
         // printing details of map in reverse order
         System.out.println("Item: " + unKey + ", Price: " + TrMap.get(unKey));
      }
   }
}

Elements of the map in Reverse Order: 
Item: Watch, Price: 2000
Item: TShirt, Price: 1500
Item: Shirt, Price: 3000
Item: Perfume, Price: 2500
Item: Kurti, Price: 4000