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https://www.youtube.com/watch?v=KnGvUeg1XS0&list=UUhwKlOVR041tngjerWxVccw
LinkedHashMapExample.java
Output
https://www.youtube.com/watch?v=KnGvUeg1XS0&list=UUhwKlOVR041tngjerWxVccw
LinkedHashMapExample.java
import java.util.LinkedHashMap; import java.util.Set; /* * Example of keySet() method. */ public class LinkedHashMapExample { public static void main( String[] args ) { LinkedHashMap<Integer, String> linkedHashMap = new LinkedHashMap<Integer, String>(); linkedHashMap.put(1, "Apple"); linkedHashMap.put(3, "Cat"); linkedHashMap.put(2, "Ball"); System.out.println("LinkedHashMap : " + linkedHashMap + "\n"); /* * Returns a Set view of the keys contained in this map. 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. */ Set<Integer> set = linkedHashMap.keySet(); System.out.println("set : " + set + "\n"); for( Integer key : set ) { System.out.println(key); } } }
LinkedHashMap : {1=Apple, 3=Cat, 2=Ball} set : [1, 3, 2] 1 3 2
https://sites.google.com/site/javaee4321/java-collections/LinkedHashMapDemoKeySet.zip?attredirects=0&d=1
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