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https://www.youtube.com/watch?v=up67Ma00CtE&list=UUhwKlOVR041tngjerWxVccw
HashMapExample.java
Output
https://www.youtube.com/watch?v=up67Ma00CtE&list=UUhwKlOVR041tngjerWxVccw
HashMapExample.java
import java.util.HashMap; import java.util.TreeMap; /* * Example of putAll(Map<? extends K,? extends V> m) method. */ public class HashMapExample { public static void main( String[] args ) { TreeMap<Integer, String> treeMap = new TreeMap<Integer, String>(); treeMap.put(1, "Apple"); treeMap.put(2, "Ball"); treeMap.put(3, "Cat"); System.out.println("treeMap : " + treeMap + "\n"); HashMap<Integer, String> hashMap = new HashMap<Integer, String>(); /* * Copies all of the mappings from the specified map to this map. These * mappings will replace any mappings that this map had for any of the * keys currently in the specified map. */ hashMap.putAll(treeMap); System.out.println("hashMap : " + hashMap); } }
treeMap : {1=Apple, 2=Ball, 3=Cat} hashMap : {1=Apple, 2=Ball, 3=Cat}
https://sites.google.com/site/javaee4321/java-collections/HashMapDemoPutAll.zip?attredirects=0&d=1
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