This examples use the Collections.binarySearch() to search an specified object inside a specified collections.

package org.kodejava.example.util;

import java.util.LinkedList;
import java.util.Collections;
import java.text.DateFormatSymbols;

public class CollectionSearch {
    public static void main(String[] args) {
        LinkedList list = new LinkedList();

        DateFormatSymbols dfs = new DateFormatSymbols();
        String[] months = dfs.getMonths();
        for (int i = 0; i < months.length; i++) {
            String month = months[i];
            list.add(month);
        }

        //
        // Prior to calling the binarySearch() method we need to sort the
        // elements of the collection. If the object is not sorted according
        // to their natural order the search result will be undefined.
        //
        Collections.sort(list);
        System.out.println("Month Names = " + list);

        //
        // Get the position of October inside the list. It returns a positive
        // value if the item found in the list.
        //
        int index = Collections.binarySearch(list, "October");
        if (index > 0) {
            System.out.println("Found at index = " + index);
            String month = (String) list.get(index);
            System.out.println("Month = " + month);
        }
    }
}

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Wayan Saryada

Programmer, runner, recreational diver, currently living in the island of Bali, Indonesia. Mostly programming in Java, creating web based application with Spring Framework, Hibernate / JPA.

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