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POimplement binary search with string prefix?
 

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    <p>How can I implement binary search to find a string with a particular prefix in generic array (which in this case will be a string[]). I tried compareTo but that wouldn't help because i have to use a string prefix. eg String prefix "Bi" bill, bilards ...etc..</p> <p>Implement the following method to return all strings in an alphabetically sorted array that start with a given prefix. For instance, given a prefix “bi”, the returned strings are ”Bill Clinton”, ”Bill Gates”, and ”Bill Joy”. Note that all string comparisons should be case INSENSITIVE. The strings in the returned list must be in the order in which they appear in the array. Your implementation must be based on binary search, and must run in worst case O(log n+k) time, where n is the length of the array, and k is the number of matching strings. Assume that the array has no duplicate entries. If there are no matches, you may either return null, or an empty array list.</p> <p>You may use the following String methods (in addition to any others you may recall): boolean startsWith(String s) int compareTo(String s) int compareToIgnoreCase(String s) String toLowerCase(String s) String toUpperCase(String s) (As for ArrayList, you only need to use the add method to add an item to the end of the array list.) You may write helper methods (with full implementation) as necessary. You may not call any method that you have not implemented yourself</p> <pre><code>public static &lt;T extends Comparable&lt;T&gt;&gt; ArrayList prefixMatch(T[] list, String prefix) { ArrayList&lt;T&gt; result = new ArrayList&lt;T&gt;(); int lo = 0; int hi = list.length - 1; while(lo &lt;= hi) { int mid = (hi + lo) / 2; list[mid].startsWith(prefix) ? 0 : list[mid].compareTo((T) prefix)); } return null; } </code></pre>
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    1. USKaran Singh
    1. USKaran Singh
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    1. COAn example would help making your question easier to understand.
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    2. COgiven a array of names of people and a prefix say "bi" i want all the names to be added to a arraylist that the entire question but i want to find the name using binarysearch with a given prefix rest i can i take care
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