Java : Collection Framework : Collections (BinarySearch)

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https://www.youtube.com/watch?v=c9otdQFVRT0&list=UUhwKlOVR041tngjerWxVccw

CollectionsExample.java

import java.util.ArrayList;
import java.util.Collections;

/*
 *  Example of  
 *  binarySearch(List<? extends Comparable<? super T>> list,T key) method
 */

public class CollectionsExample
{

    public static void main(String[] args)
    {
        ArrayList<String> arrayList = new ArrayList<String>();

        arrayList.add("Ajay");
        arrayList.add("Vijay");
        arrayList.add("David");
        arrayList.add("Raju");
        arrayList.add("Karan");     

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

        /*
         * Searches the specified list for the specified object using the binary
         * search algorithm. The list must be sorted into ascending order
         * according to the natural ordering of its elements (as by the
         * sort(List) method) prior to making this call. If it is not sorted,
         * the results are undefined. If the list contains multiple elements
         * equal to the specified object, there is no guarantee which one will
         * be found.
         * 
         * Returns: the index of the search key, if it is contained in the list
         */
        int indexPostion = Collections.binarySearch(arrayList, "Raju");
        
        System.out.println("indexPostion : "+indexPostion+"\n");        

    }

}

Output

arrayList : [Ajay, Vijay, David, Raju, Karan]

indexPostion : 3

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

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