Java : Collection Framework : TreeMap (lowerEntry)

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TreeMapExample.java

import java.util.Map;
import java.util.TreeMap;

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

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

        treeMap.put(10, "Cat");
        treeMap.put(50, "Dog");
        treeMap.put(30, "Apple");
        treeMap.put(40, "Ball");
        treeMap.put(20, "Eagle");

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

        /*
         * Returns a key-value mapping associated with the greatest key strictly
         * less than the given key, or null if there is no such key.
         */
        Map.Entry<Integer, String> entry = treeMap.lowerEntry(35);

        System.out.println("lowerEntry(35) : " + entry);
        
        entry = treeMap.lowerEntry(50);

        System.out.println("lowerEntry(50) : " + entry);
        
        entry = treeMap.lowerEntry(10);

        System.out.println("lowerEntry(10) : " + entry);

    }
}

Output

treeMap : {10=Cat, 20=Eagle, 30=Apple, 40=Ball, 50=Dog}

lowerEntry(35) : 30=Apple
lowerEntry(50) : 40=Ball
lowerEntry(10) : null

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

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