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https://www.youtube.com/watch?v=uEofbxM14Tc&list=UUhwKlOVR041tngjerWxVccw
TreeMapExample.java
Output
https://www.youtube.com/watch?v=uEofbxM14Tc&list=UUhwKlOVR041tngjerWxVccw
TreeMapExample.java
import java.util.NavigableSet; import java.util.TreeMap; /* * Example of descendingKeySet() 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. */ NavigableSet<Integer> navigableSet = treeMap.descendingKeySet(); System.out.println("navigableSet : " + navigableSet + "\n"); for( Integer key : navigableSet ) { System.out.println(key); } } }
treeMap : {10=Cat, 20=Ball, 30=Apple, 40=Dog} navigableSet : [40, 30, 20, 10] 40 30 20 10
https://sites.google.com/site/javaee4321/java-collections/TreeMapDemoDescendingKeySet.zip?attredirects=0&d=1
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