Click here to watch in Youtube :
https://www.youtube.com/watch?v=9KWN7OOs-YU&list=UUhwKlOVR041tngjerWxVccw
TreeMapExample.java
Output
https://www.youtube.com/watch?v=9KWN7OOs-YU&list=UUhwKlOVR041tngjerWxVccw
TreeMapExample.java
import java.util.NavigableMap; import java.util.Set; import java.util.TreeMap; /* * Example of descendingMap() method. */ public class TreeMapExample { public static void main( String[] args ) { TreeMap<Integer, String> treeMap = new TreeMap<Integer, String>(); treeMap.put(10, "Cat"); treeMap.put(40, "Dog"); treeMap.put(30, "Apple"); treeMap.put(20, "Ball"); System.out.println("treeMap : " + treeMap + "\n"); /* * Returns a reverse order NavigableSet view of the keys contained in * this map. The set's iterator returns the keys in descending order. * The set is backed by the map, so changes to the map are reflected in * the set, and vice-versa. * * If the map is modified while an iteration over the set is in progress * (except through the iterator's own remove operation), the results of * the iteration are undefined. The set supports element removal, which * removes the corresponding mapping from the map, via the * Iterator.remove, Set.remove, removeAll, retainAll, and clear * operations. It does not support the add or addAll operations. */ NavigableMap<Integer,String> NavigableMap = treeMap.descendingMap(); System.out.println("NavigableMap : " + NavigableMap + "\n"); Set<Integer> set = NavigableMap.keySet(); System.out.println("set : " + set + "\n"); System.out.println("-----------------------"); System.out.println("Key" + " | " + "value"); System.out.println("-----------------------"); for( Integer key : set ) { String value = NavigableMap.get(key); System.out.println(key + " | " + value); } } }
treeMap : {10=Cat, 20=Ball, 30=Apple, 40=Dog} NavigableMap : {40=Dog, 30=Apple, 20=Ball, 10=Cat} set : [40, 30, 20, 10] ----------------------- Key | value ----------------------- 40 | Dog 30 | Apple 20 | Ball 10 | Cat
https://sites.google.com/site/javaee4321/java-collections/TreeMapDemoDecendingMap.zip?attredirects=0&d=1
See also:
well explained .There is also good treemap exaples visit Treemap Tutorial
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