Friday, 30 January 2015

Java : Collection Framework : TreeMap (Get)


Click here to watch in Youtube : 
https://www.youtube.com/watch?v=VP537HT0rqw&list=UUhwKlOVR041tngjerWxVccw

TreeMapExample.java
import java.util.TreeMap;

/*
 * Example of get(Object key) method.
 */
public class TreeMapExample
{
    public static void main( String[] args )
    {

        TreeMap<Integer, String> treeMap = new TreeMap<Integer, String>();

        treeMap.put(1, "Cat");
        treeMap.put(2, "Dog");
        treeMap.put(4, "Apple");
        treeMap.put(3, "Ball");

        System.out.println("treeMap : " + treeMap +"\n");

        /*
         * Returns the value to which the specified key is mapped, or null if
         * this map contains no mapping for the key.
         * 
         * A return value of null does not necessarily indicate that the map
         * contains no mapping for the key; it's also possible that the map
         * explicitly maps the key to null. The containsKey operation may be
         * used to distinguish these two cases.
         */
        String value = treeMap.get(2);

        System.out.println("value for the Key '2' : " + value);

        value = treeMap.get(10);

        System.out.println("value for the Key '10' : " + value);

    }
}
Output
treeMap : {1=Cat, 2=Dog, 3=Ball, 4=Apple}

value for the Key '2' : Dog
value for the Key '10' : null
To Download TreeMapDemoGet Project Click the below link
https://sites.google.com/site/javaee4321/java-collections/TreeMapDemoGet.zip?attredirects=0&d=1

See also:
  • All JavaEE Viedos Playlist
  • All JavaEE Viedos
  • Servlets Tutorial
  • All Design Patterns Links
  • JDBC Tutorial
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