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    <p>This should work:</p> <pre><code> Comparator&lt;String&gt; startsWithComparator = new Comparator&lt;String&gt;() { public int compare(String currentItem, String key) { if(currentItem.startsWith(key)) { return 0; } return currentItem.compareTo(key); } }; int index = Collections.binarySearch(items, "contact.", startsWithComparator); </code></pre> <p>However sorting and then binary searching is less efficient than the single pass iteration.</p> <p><strong>Addendum:</strong></p> <p>Though the above answer helps you, here is another way (inspired from Scala, Google Collections) :</p> <pre><code>List&lt;String&gt; items = Arrays.asList("one", "two", "three", "four", "five", "six"); int index = find(items, startsWithPredicate("th")); System.out.println(index); public static Predicate&lt;String&gt; startsWithPredicate(final String key) { return new Predicate&lt;String&gt;(){ @Override public boolean apply(String item) { return item.startsWith(key); } }; } public static &lt;T&gt; int find(Collection&lt;T&gt; items, Predicate&lt;T&gt; predicate) { int index = 0; for(T item: items) { if(predicate.apply(item)) { return index; } index++; } return -1; } interface Predicate&lt;T&gt; { boolean apply(T item); } </code></pre> <p>Here the thing is the find() method is not tied with your 'matching' logic; it just finds an element that satisfies the predicate. So you could pass on a different implementation of predicate, for ex. which can check 'endsWith' to find() method and it would return the found item which ends with a particular string. Further the find() method works for any type of collection; all it needs is a predicate which transforms an element of collection element type to a boolean. This multiple lines of code around a simple logic also show the Java's lack of support for first class functions.</p>
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    1. USMarimuthu Madasamy
    1. USMarimuthu Madasamy
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    1. COThanks. You answered all questions. I will keep my single loop
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      1. USShervin Asgari
 

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