Java : Collection Framework : TreeMap (ContainsKey)

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TreeMapExample.java

import java.util.TreeMap;

/*
 * Example of containsKey(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 true if this map contains a mapping for the specified key.
         */
        boolean isKeyExist = treeMap.containsKey(2);

        System.out.println("isKey '2' Exist : " + isKeyExist);

        isKeyExist = treeMap.containsKey(8);

        System.out.println("isKey '8' Exist : " + isKeyExist);

    }
}

Output

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

isKey '2' Exist : true
isKey '8' Exist : false

To Download TreeMapDemoContainsKey Project Click the below link
https://sites.google.com/site/javaee4321/java-collections/TreeMapDemoContainsKey.zip?attredirects=0&d=1

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