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TreeMapExample.java
Output
https://www.youtube.com/watch?v=HJ1ecY5MQw8&list=UUhwKlOVR041tngjerWxVccw
TreeMapExample.java
import java.util.TreeMap; /* * Example of put(K key,V value) method. */ public class TreeMapExample { public static void main( String[] args ) { TreeMap<Integer, String> treeMap = new TreeMap<Integer, String>(); /* * Associates the specified value with the specified key in this map. If * the map previously contained a mapping for the key, the old value is * replaced. * * Returns: the previous value associated with key, or null if there was * no mapping for key. (A null return can also indicate that the map * previously associated null with key.) */ String value = treeMap.put(1, "Apple"); System.out.println("Previous value associated with key '1' : " + value); System.out.println("treeMap : " + treeMap + "\n"); value = treeMap.put(1, "Ball"); System.out.println("Previous value associated with key '1' : " + value); System.out.println("treeMap : " + treeMap); } }
Previous value associated with key '1' : null treeMap : {1=Apple} Previous value associated with key '1' : Apple treeMap : {1=Ball}
https://sites.google.com/site/javaee4321/java-collections/TreeMapDemoPutReturn.zip?attredirects=0&d=1
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